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Enhanced dielectric tunability and energy storage properties of plate-like Ba0.6Sr0.4TiO3/poly(vinylidene fluoride) composites through texture arrangement
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Li Wang, Feng Gao, Jie Xu, Kena Zhang, Jie Kong, Mike Reece, Haixue Yan Plate-like (Ba0.6Sr0.4)TiO3 (P-BST) particles were synthesized via topochemical microcrystal conversion using a two-step molten salt method. In addition, P-BST/poly(vinylidene fluoride) (PVDF) textured composites were fabricated using a tape casting and hot pressing method. The influence of the P-BST particle size on the microstructure, dielectric tunability, and energy storage properties of the P-BST/PVDF textured composites was investigated. The results r...
Source: Composites Science and Technology - February 18, 2018 Category: Science Source Type: research

Strain sensing behaviors of GnPs/epoxy sensor and health monitoring for composite materials under monotonic tensile and cyclic deformation
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Shaowei Lu, Caijiao Tian, Xiaoqiang Wang, Lu Zhang, Kai Du, Keming Ma, Tao Xu The graphene platelets (GnPs)/epoxy flexible sensor with controllable sensitivity and linearity can be used to monitor the deformation and damage of composite structures. The sensitivity and linearity can be regulated by dispersing different content of GnPs in epoxy and the dispersion was better improved by optimizing ultrasonic time and the ball mill mixing process. The GnPs/epoxy mixture exhibited relatively low percolation threshold of 0.76 vol %...
Source: Composites Science and Technology - February 16, 2018 Category: Science Source Type: research

Porous superhydrophobic polymer/carbon composites for lightweight and self-cleaning EMI shielding application
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Xiaohui Ma, Bin Shen, Lihua Zhang, Yinfeng Liu, Wentao Zhai, Wenge Zheng Porous superhydrophobic polymer composites with satisfying electromagnetic interference (EMI) shielding and self-cleaning function were fabricated by choosing poly(vinylidene fluoride) as low-surface-energy matrix as well as carbon nanotubes and graphene as hybrid filler through a modified water vapor-induced phase separation process with non-woven fabric (NWF) as a template in one step. The hybrid filler can form more effective conductive networks, and th...
Source: Composites Science and Technology - February 13, 2018 Category: Science Source Type: research

Novel three-component nanocomposites with high dielectric permittivity and low dielectric loss co-filled by carboxyl-functionalized multi-walled nanotube and BaTiO3
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Shanshan Guan, Hai Li, Shugao Zhao, Laina Guo In this work, a novel ternary polydimethylsiloxane (PDMS)-based nanocomposite co-filled by carboxyl-functionalized multi-walled nanotube (cMWCNT) and BaTiO3(BT) nanoparticle were developed. The hybrids cMWCNT-BT was realized via the hydrogen bonding (H-bonding) interaction between –COOH groups of cMWCNT and the -OH groups of BT. Compared with the binary composite of BT/PDMS and cMWCNT/PDMS, the results showed that the kind of three-component nanocomposites had high dielectric ...
Source: Composites Science and Technology - February 11, 2018 Category: Science Source Type: research

Effect of vacuum thermal cycling on the compression and shear performance of composite sandwich structures containing pyramidal truss cores
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Xiaodong Li, Jian Xiong, Li Ma, Linzhi Wu, Xiangqiao Yan Composite pyramidal-truss core sandwich panels, in which the lattice core is strengthened by reinforced frames between dispersive nodes, were manufactured via water-jet cutting and interlocking assembly. The coefficients of thermal expansion and outgassing (mass loss) ratios of the composite laminates were determined. Subsequently, the effect of vacuum thermal cycling on the compression and shear performance of the composite sandwich panels with pyramidal-truss cores was ...
Source: Composites Science and Technology - February 11, 2018 Category: Science Source Type: research

Dynamic and regional constructive electromagnetic protecting materials made by MWNT/Fe3O4/poly pyrrole doped vitrimers
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Hong Zhang, Haiping Han, Xuecheng Xu Electromagnetic protection is always an important factor for electrical device. Therefore electromagnetic shielding materials (ESM) with good properties such and easy-processing is desirable. Vitrimer, a kind of material that equipped with advantages of both thermoplastics and thermosets, such as proof of acid and alkaline, mechanical stability, and easy processing was recently discovered. In our research, we use vitrimer as matrix, doped with MWNT/Fe3O4 composite, to form a new kind of ESM....
Source: Composites Science and Technology - February 11, 2018 Category: Science Source Type: research

Formation of the three-dimensional (3D) interlinked hybrid shish-kebabs in injection-molded PE/PE-g-CNF composite by “structuring” processing
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Xiao-Chao Xia, Dan-Dan Xie, Yan-Hao Huang, Ming-Bo Yang The target of this study is to construct 3D interlinked structure that mimicks the structure of shell by “structuring” processing. Therefore, lightly cross-linked HDPE and PE-g-CNF that aligned along the flow direction by intense shear flow were purposely designed. During this process, strong interfacial ligaments were built on the surface of ordered CNFs. At the same time, innumerable linked kababs were formed, and they served as bridges to tightly link adjace...
Source: Composites Science and Technology - February 10, 2018 Category: Science Source Type: research

Fabrication of an enriched graphene surface protection of carbon fiber/epoxy composites for lightning strike via a percolating-assisted resin film infusion method
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Ben Wang, Yugang Duan, Zhibo Xin, Xueling Yao, Dilmurat Abliz, Gerhard Ziegmann A low-conductivity feature of carbon fiber-reinforced polymers (CFRP) needs to be engineered with lightning strike protection to decrease the vulnerability of the material to lightning strike damage. This paper reports a percolating-assisted resin film infusion method that achieves a conductive lightning strike protection via the accumulation of reduced graphene oxide (RGO) on the composite surface. In this method, the fibrous preform was sealed by ...
Source: Composites Science and Technology - February 10, 2018 Category: Science Source Type: research

Fabrication and properties of novel polymer-metal composites using fused deposition modeling
This study investigated the novel fabrication of polymer-metal composites using fused deposition modeling (FDM), and evaluated the mechanical and physical properties of the new materials. Specifically, an acrylonitrile butadiene styrene (ABS) – 420 stainless steel (SS) composite system was used, with 10, 15, and 23 wt% SS powder additions, and the resulting properties were compared to those of base ABS prepared using the same printing conditions. A new methodology to fabricate the composites was developed. The resulting materials were extruded into composite filaments, which were used to print test specimens. Tensi...
Source: Composites Science and Technology - February 10, 2018 Category: Science Source Type: research

Reinforcement of shape-memory poly(ethylene-co-vinyl acetate) by carbon fibre to access robust recovery capability under resistant condition
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Hui Xie, Lu Li, Xiao-Ying Deng, Chuan-Ying Cheng, Ke-Ke Yang, Yu-Zhong Wang Poly (ethylene-co-vinyl acetate) (EVA), as one of commercial polymers, has been used early to fabricate shape-memory polymers (SMPs). However, its low recovery stress restricts the potential applications in some tough conditions due to its high flexible feature. Herein, we developed a series of EVA-based composites (cEVA/CF) with remarkably enhanced recovery stress both in free-state and resistant condition by incorporating different amounts of a stiff ...
Source: Composites Science and Technology - February 8, 2018 Category: Science Source Type: research

Sustainable packaging biocomposites from polylactic acid and wheat straw: Enhanced physical performance by solid state shear milling process
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Shuangqiao Yang, Shibing Bai, Qi Wang As a sustainable and inexpensive agricultural byproduct, wheat straw has gained major interest as filler in green composites in recent years, but previous studies about PLA/wheat straw composites have reported modest enhancement or even major reduction in physical performance. Here, we report a new method for both production cellulose nanofibrils and achieving excellent dispersion in composites free of solvent for the first time, and enhanced physical performance is obtained via solid state...
Source: Composites Science and Technology - February 8, 2018 Category: Science Source Type: research

Strong and biocompatible lignin /poly (3-hydroxybutyrate) composite nanofibers
In this study, we proposed lignin copolymers as mechanical reinforcement agents for PHB. A series of lignin copolymers (random and block) were synthesized via the solvent free ring-opening polymerization (ROP) of β-butyrolactone and/or ε-caprolactone onto lignin core. The lignin copolymers were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). Next, these lignin copolymers were incorporated into PHB nanofibers as reinforcement fillers, in order to improve their mechanical properties. It is found that the lignin block copolymer wi...
Source: Composites Science and Technology - February 8, 2018 Category: Science Source Type: research

Carbon fiber assisted glass fabric composite materials for broadband radar cross section reduction
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Yongqiang Pang, Yongfeng Li, Jiafu Wang, Mingbao Yan, Hongya Chen, Liangkui Sun, Zhuo Xu, Shaobo Qu Carbon fibers (CFs) have been widely used as absorbing materials for radar cross section (RCS) reduction. Here, an alternative approach for CFs is proposed to achieve the same goal and has been performed by the glass fabric composites loaded with a small number of CFs. The reduction mechanism of our proposal is phase cancellation instead of absorption. Two prototypes in chessboard and random patterns are analyzed numerically and ...
Source: Composites Science and Technology - February 8, 2018 Category: Science Source Type: research

In situ assembly of SiO2 nanodots/layered double hydroxide nanocomposite for the reinforcement of solution-polymerized butadiene styrene rubber/butadiene rubber
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Linghan Kong, Feng Li, Fanghui Wang, Ye Miao, Xidai Huang, Hong Zhu, Yonglai Lu In the present work, SiO2 nanodots were in situ assembled with MgAl-layered double hydroxide (LDH), and the resulting SiO2/LDH nanocomposite was mixed and vulcanized with solution-polymerized styrene butadiene rubber/butadiene rubber (SSBR/BR) to form rubber composites (SiO2/LDH-SSBR/BR). The structure of SiO2/LDH and the resulting rubber composites were characterized by SEM, TEM, high-resolution TEM, XRD, FT-IR, and XPS. It was found that SiO2 nano...
Source: Composites Science and Technology - February 8, 2018 Category: Science Source Type: research

Effect of annealing treatment on crystalline and dielectric properties of PVDF/PEG-containing ionic liquid composites
Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Pei Xu, Weijia Fu, Yadong Hu, Yunsheng Ding To investigate the effect of poly(ethylene glycol)-containing ionic liquid (IL) and thermal annealing treatment on crystallization and dielectric relaxation behavior of poly(vinylidene fluoride) (PVDF), a series of PVDF/IL composites have been prepared using a solution-cast method. The interaction between imidazolium cation of ILs and >CF2 groups of PVDF can transfer nonpolar α phase to polar β and γ phase as a template at the primary crystallization, and then ...
Source: Composites Science and Technology - February 8, 2018 Category: Science Source Type: research

Interface micro-texturing for interlaminar toughness tailoring: a film-casting technique
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): F. Narducci, K.-Y. Lee, S.T. Pinho In this work, we developed a film-casting technique to deposit thin ( ∼ 13 μm) layers of poly(lactic acid) (PLA) on the interface of carbon/epoxy prepregs, with the aim of increasing the interlaminar toughness. PLA patches with fractal shape were explored, based on preliminary results showing that the toughening effect increases when PLA is deposited at multiple scales simultaneously. Double Cantilever Beam (DCB) and 4-point End-Notched Flexure (4ENF) tests showed an increase in int...
Source: Composites Science and Technology - February 7, 2018 Category: Science Source Type: research

A cohesive zone model incorporating a Coulomb friction law for fiber-reinforced composites
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Guodong Nian, Qiyang Li, Qiang Xu, Shaoxing Qu A cohesive zone model (CZM) combining interfacial debonding, frictional sliding, and coupling between decohesion and friction is developed. The proposed interface model forms by incorporating a Coulomb friction law into the bilinear traction-separation law, and only one additional parameter is introduced compared to the traditional CZM. To verify this model, microbond test is carried out using an in-house developed tester. The interface model has been implemented into a commercial ...
Source: Composites Science and Technology - February 7, 2018 Category: Science Source Type: research

In-situ synthesized CNTs/Bi2Se3 nanocomposites by a facile wet chemical method and its application for enhancing fire safety of epoxy resin
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Yanbei Hou, Weizhao Hu, Longxiang Liu, Zhou Gui, Yuan Hu In this work, a flowering-branch like CNTs/Bi2Se3 hybrids was synthesized by a facile in-situ method. CNTs as carrier could provide low agglomeration of layered Bi2Se3. As-prepared nanomaterials were added into epoxy resin (EP) to enhance its fire safety. Compared with neat EP, there were more than 44% and 23% decrease in the value of peak heat release and total heat release with 2 wt% content of CNTs/Bi2Se3, respectively, confirmed the enhancement of flame retardancy o...
Source: Composites Science and Technology - February 7, 2018 Category: Science Source Type: research

A novel mild method for surface treatment of carbon fibres in epoxy-matrix composites
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Nikos Koutroumanis, Anastasios C. Manikas, Panagiotis Nektarios Pappas, Faidonas Petropoulos, Lamprini Sygellou, Dimitrios Tasis, Kostas Papagelis, George Anagnostopoulos, Costas Galiotis The interface quality between the reinforcement and the host matrix plays a key role in the mechanical performance of Carbon Fibre/Epoxy Resin (CFRP) composites. In most cases, an adequately strong interfacial bond is induced chemically either by the oxidation of the carbon fibre (CF) surface and/or by means of mechanical interlocking (frictio...
Source: Composites Science and Technology - February 6, 2018 Category: Science Source Type: research

One-step modification and nanofibrillation of microfibrillated cellulose for simultaneously reinforcing and toughening of poly( ε-caprolactone)
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Sha Deng, Jinrui Ma, Yilan Guo, Feng Chen, Qiang Fu Extensive efforts have been devoted to utilize cellulose fibers as reinforcement for poly(ε-caprolactone) (PCL) to prepare fully biodegradable composites with enhanced mechanical properties, but unfortunately the improvement of strength is always at the sacrifice of toughness. In the current work, we have developed an efficient way to prepare poly(ε-caprolactone)/functionalized cellulose nanofibers (PCL/f-NFC) nanocomposite, which is both strong and ductile. La...
Source: Composites Science and Technology - February 6, 2018 Category: Science Source Type: research

Microwave transparent crosslinked polystyrene nanocomposites with enhanced high voltage resistance via 3D printing bulk polymerization method
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Yuanwu Chen, Jiale Mao, Jingshen Wu Demanded by the application in ultrahigh pulsed power generator as vacuum insulator, the MgO-filled nanocomposites with enhanced high voltage resistance were developed on the basis of microwave transparent crosslinked polystyrene (CPS). Considering the severe thermal runaway problem, a proprietary fabrication method combing the in-situ preparation with 3D printing bulk polymerization technique was also innovated and bulk products with different filler loading were successfully fabricated. The...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Fabrication and testing of composite hierarchical Isogrid stiffened cylinder
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Ming Li, Fangfang Sun, Changliang Lai, Hualin Fan, Bin Ji, Xi Zhang, Debo Liu, Daining Fang To get strong, stiff and light cylindrical shell, carbon fiber reinforced hierarchical Isogrid stiffened cylinder (HISC) was designed and fabricated. The cylinder has fractal stiffeners, including the first-order primary Isogrid stiffeners and the self-similar second-order sub-Isogrid stiffeners. The primary Isogrid has thick and high ribs and contains several sub-Isogrid cells whose rib is much thinner and lower. The primary Isogrid imp...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Efficient large-scale preparation of defect-free few-layer graphene using a conjugated ionic liquid as green media and its polyetherimide composite
In this report, a conjugated ionic liquid (IL) is designed and synthesized, which is used as a green medium to easily exfoliate graphite into graphene with the assistance of microwave irradiation. The as-prepared IL-functionized graphene nanoplatelets (GNPIL) is few-layer, large-size and defect-free, which is attributed to the strong π-π and cation-π interactions between conjugated IL and graphene layers. And the results show that a relatively high yield of 40% is obtained. The high-quality GNPIL could be dispersed in organic solvent homogeneously and stably with a high content, which is beneficial for its further...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Flexural deformation and fracture behaviors of bamboo with gradient hierarchical fibrous structure and water content
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Guowei Chen, Hongyun Luo, Sujun Wu, Juan Guan, Jun Luo, Tianshu Zhao Natural gradient fibrous bamboo bended from two opposite directions (divided as Type I and Type II samples) showed pronounced asymmetric flexural performances as the water contents gradually increased (0%, 6%, 22% and 35%). The real-time flexural deformation and fracture behaviors were detected and analyzed with the aid of acoustic emission (AE). Results indicated that there were three kinds of mechanical behaviors during the flexural deformation and fracture ...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Polyphenylene sulfide nonwoven-based composite separator with superior heat-resistance and flame retardancy for high power lithium ion battery
In this study, a new alternative nonwoven based on engineering plastic polyphenylene sulfide (PPS) was explored as the support to construct high performance and safety separator for the first time. By the method of physical coating polymer poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) and inorganic nanoparticle SiO2 on the support, the designed composite separator was successfully obtained for lithium ion battery. Systematic investigations ranging from physical properties, thermal properties to electrochemical performances were carried out. It was found that compared with commercialized polyolefin separator, PPS...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

A flexible transparent heater with ultrahigh thermal efficiency and fast thermal response speed based on a simple solution-processed indium tin oxide nanoparticles-silver nanowires composite structure on photo-polymeric film
In this study, a composite structure consisting of indium tin oxide nanoparticles (ITO-NPs)-silver nanowires (Ag NWs) on photo-polymeric film was intensively studied for flexible transparent heater with ultrahigh thermal efficiency and fast thermal response speed. For cost-effective manufacturing, a simple solution process was employed to make low-cost composite structure by using 0.15 wt% Ag NWs and 5 wt% ITO-NPs solution. Among 3 types, namely, 2-layer (Ag NWs/ITO-NPs), 2′-layer (ITO-NPs/Ag NWs), and 3-layer (ITO-NPs/Ag NWs/ITO-NPs) sample, the composite structure was optimized as 3-layer, which raised temperat...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Failure mechanisms in bioinspired helicoidal laminates
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): J.L. Liu, H.P. Lee, V.B.C. Tan Previous research has shown that stacking unidirectional laminates helicoidally with small interply angles resulted in improvements in transverse load resistance. Guided by computational simulations, damage evolution within helicoidal and cross-ply laminates was tracked with further experiments to offer an insight into key differences responsible for their distinct load bearing characteristics. Under transverse loads, the first form of damage is delamination. Unlike cross-plys, which suffer multip...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

A coupled elastic-plastic damage model for the mechanical behavior of three-dimensional (3D) braided composites
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Jingran Ge, Chunwang He, Jun Liang, Yanfei Chen, Daining Fang A coupled elastic-plastic damage model is developed to describe the non-linear mechanical behavior of three-dimensional (3D) braided composites. In this model, the fiber breakage, inter-fiber fracture and matrix fracture are considered in the level of the fiber bundle and matrix. The onset and propagation of fiber bundle failure mechanisms are elastic and brittle, which is accounted for elastic damage model, and the elastic-plastic damage model used to describe the d...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Homogeneous transfer of graphene oxide into photoresist: Fabrication of high surface area three-dimensional micro-arrays by modified photolithography
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Bing Xue, Yingquan Zou Herein, we studied the homogeneous transfer of graphene oxide (GO) into photocurable SU-8 photoresist for fabricating GO/SU-8 three-dimensional (3D) composite micropillar arrays by modified photolithography. SU-8 is a negative toned epoxy based photoresist, which includes 8 epoxy groups in each SU-8 monomer. The effects of the concentration of GO flakes on the thermal, mechanical and specific surface area (SSA) properties of the resultant composites were investigated. The large amount of oxygen functional...
Source: Composites Science and Technology - February 4, 2018 Category: Science Source Type: research

Towards balanced mechanical and electrical properties of thermoplastic vulcanizates composites via unique synergistic effects of single-walled carbon nanotubes and graphene
This study presents a new insight into the fabrication of high-performance TPV composites via the synergistic effects of hybrid fillers. (Source: Composites Science and Technology)
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

Terahertz time-domain spectroscopy of weld line defects formed during an injection moulding process
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Gyung-Hwan Oh, Ji-Hye Jeong, Sung-Hyeon Park, Hak-Sung Kim The terahertz time-domain spectroscopy (THz-TDS) imaging technique was used to detect the weld line defect of an injection-moulded short glass fiber-reinforced composite. To determine the effect of the weld lines on tensile strength, tensile tests were conducted with the specimens fabricated with NORYL (amorphous blends of polyphenylene ether resin and polystyrene) having a short glass fiber content ranging from 0% to 30%. The time delay phenomenon of the THz waves was ...
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

Enhanced sheet-sheet welding and interfacial wettability of 3D graphene networks as radiation protection in gamma-irradiated epoxy composites
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Haibo Wang, Nan Li, Zhiwei Xu, Xu Tian, Wei Mai, Jing Li, Cheng Chen, Lei Chen, Hongjun Fu, Xingxiang Zhang 3D graphene networks (3DGN) as reinforcement for epoxy composites have attracted intense attention, while the interfacial adhesion with the matrix is still a key issue. With respect to the impact between interfacial wettability for graphene sheets in 3DGN and the performance for epoxy-based composites, 3DGNs prepared by self-assembly method, have been carbonized in N2 at heat treatment temperature between 220 and 800 &d...
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

Enhancement of dielectric constant in polymer-ceramic nanocomposite for flexible electronics and energy storage applications
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Sunil Kumar, Sweety Supriya, Manoranjan Kar The polymer nanocomposites have potential applications in flexible electronics due to its interesting dielectric properties. Hence, flexible nanocomposite films of polyvinylidene fluoride (PVDF) polymer and barium hexaferrite (BHF) nanoparticles with high dielectric constant were prepared by the solution cast method. The dielectric behavior of the materials has been understood by employing the impedance spectroscopy technique. The co-existence of α and β phases of PVDF has ...
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

Hot-pressing composite curling deformation characteristics of plastic film-reinforced pliable decorative sliced veneer
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Xiaorui Peng, Zhankuan Zhang The new type of plastic-film-reinforced pliable decorative sliced veneer (PRPDSV) is a green product that features remarkable water resistance, no glue penetration, easy operation, low cost, good environmental protection, and no formaldehyde release. However, curling deformation under high-temperature hot-pressing is a bottleneck in the industrial development of this product. The relationship among hot-pressing temperature, thickness of decorative sliced veneer and plastic film, and type of decorati...
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

CNT-PAN hybrid nanofibrous mat interleaved carbon/epoxy laminates with improved Mode I interlaminar fracture toughness
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Volkan Eskizeybek, Adem Yar, Ahmet Avcı Interleaving laminated composites with electrospun nanofibrous mats comes out as a promising micro--scale strategy to strengthen interlaminar regions of laminated composites. The aim of this study is to evaluate the synergetic contribution of nano- and micro-scale mechanisms on interlaminar delamination. For this, carbon nanotubes (CNTs) reinforced polyacrylonitrile (PAN) electrospun hybrid mats were successfully fabricated and utilized as interleaves within the interlaminar region of ca...
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

Highly enhanced electromechanical properties of PVDF-TrFE/SWCNT nanocomposites using an efficient polymer compatibilizer
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Kie Yong Cho, Hyunchul Park, Hyun-Ji Kim, Xuan Huy Do, Chong Min Koo, Seung Sang Hwang, Ho Gyu Yoon, Kyung-Youl Baek PVDF-TrFE/SWCNT nanocomposites with outstanding electromechanical properties were produced using P3HT-PMMA block copolymers as a compatibilizer between PVDF-TrFE and SWCNT. P3HT-PMMA block copolymer coated SWCNT (PTMCNT) was first prepared to utilize π-π stacking interactions between SWCNT and the P3HT block segment. The obtained PTMCNTs are highly compatible with the PVDF-TrFE matrix due to strong hydrogen...
Source: Composites Science and Technology - February 3, 2018 Category: Science Source Type: research

Mechanical response of carbon/epoxy composite sandwich structures with three-dimensional corrugated cores
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Guo-dong Xu, Zhi-hai Wang, Tao Zeng, Su Cheng, Dai-ning Fang A novel three-dimensional (3D) corrugated core sandwich structure was designed and fabricated by auto-cutting process. Mechanical behaviors and failure mechanism of 3D corrugated core sandwich structures were investigated. Analytical models were developed to estimate the strength, stiffness and dominant failure modes. In order to demonstrate sensitivity of the graded parameters on mechanical behaviors of 3D corrugated core sandwich structures, the specimens with differ...
Source: Composites Science and Technology - February 1, 2018 Category: Science Source Type: research

Macro-mechanical damage modeling of fibrous composite materials accounting for non-linear material behavior
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): G.A. Abu-Farsakh, A.M. Asfa In the present paper, a new macro-mechanical model for tracing damage-evolution in composite materials is proposed. The present model represents a new extension and a new approach to a previous model (Ghazi-Farid model), which can be applied for a general state of stress. The model is verified by comparing its results with those corresponding to Ghazi-Farid model for different composite materials and it seems to give very close correlations. The proposed model can be applied to both elastic and inelas...
Source: Composites Science and Technology - February 1, 2018 Category: Science Source Type: research

A novel expandable porous composite based on acetalized polyvinyl alcohol and calcium sulfate used for injectable bone repair materials
In this study, a novel expandable bone cement was prepared with acetalized polyvinyl alchol porous material (APVA-PM) and CSH. By controlling the content of APAV-PM, composite cements with different structures and morphology were obtained and investigated by using SEM, FT-IR, XRD. The physical properties including setting time, porosity and expansion ratio were studied. CSH/APVA-PM bone cement could produce volume expansion in the setting process and form a porous structure after curing. The setting time decreased with the increase of the volume fraction of APVA-PM. APVA-PM improved the toughness of calcium sulfate cement,...
Source: Composites Science and Technology - February 1, 2018 Category: Science Source Type: research

A highly stretchable and stable strain sensor based on hybrid carbon nanofillers/polydimethylsiloxane conductive composites for large human motions monitoring
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Yanjun Zheng, Yilong Li, Kun Dai, Yan Wang, Guoqiang Zheng, Chuntai Liu, Changyu Shen Stretchable strain sensors have promising potentials in wearable electronics for human motion detection, health monitoring and so on. A reliable strain sensor with high flexibility and good stability should be designed to detect human joints motions with a large deformation. Here, a simple and facile solution mixing-casting method was adopted to fabricate a highly stretchable strain sensor based on composites mixing polydimethylsiloxane (PDMS) ...
Source: Composites Science and Technology - January 17, 2018 Category: Science Source Type: research

Strong, transparent and flexible aramid nanofiber/POSS hybrid organic/inorganic nanocomposite membranes
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Fang Wang, Yadong Wu, Yudong Huang, Li Liu Mechanical performance, transparency and thermal stability still remain the dominating constraints for the application of polymeric composite membranes. Thus, the research and development of co-effectively strong, transparent and heat-resistant membranes are necessary and significant for promoting practical outcomes. POSS NPs is incorporate into the structure of aramid nanofibers (ANFs) to synthesize the ANFPs nanocomposite membranes with different amounts of POSS by vacuum-assisted flo...
Source: Composites Science and Technology - January 17, 2018 Category: Science Source Type: research

Unraveling crack stability and strain localization in staggered composites by fracture analysis on the shear-lag model
In this study, fracture analysis is carried out on staggered composites with the brick-and-mortar structure. An analytical formula predicting the onset of strain localization emerges from the analysis and is validated by finite element analysis. Furthermore, showing good agreements with independent tensile tests on multi-layer graphene assemblies, our model demonstrates its applicability to explain the strain localization in composites consisting of interfaces that function through re-formable bonds. Characteristic length scales emerging from the analysis can be used to guide the composites design to optimize material toug...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Silkworm silk fibers vs PEEK reinforced rubber luminescent strain gauge and stretchable composites
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Luca Valentini, Silvia Bittolo Bon, Lorenzo Mussolin, Nicola M. Pugno In the present study we demonstrate how the sensitive property of the constituent parts of silkworm silk fiber can be applied to the field of soft composite materials. It concerns the structural and intrinsic functional characteristics of silk vs. the macroscopic property and the realization of functional composites. Silk fiber reinforced silicone rubber (SR) composites have been fabricated with different fiber lengths. The key structural features of silk made...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Interfacial designing of PP/GF composites by binary incorporation of MAH-g-PP and lithium bis(trifloromethanesulfonyl)imide: Towards high strength composites with excellent antistatic performance
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Senlin Gu, Huanhuan Liu, Xuan Li, Claude Mercier, Yongjin Li High strength polypropylene (PP)/glass fiber (GF) composites with excellent antistatic performance were prepared by binary incorporation of maleic anhydride grafted polypropylene (MAPP) and lithium bis(trifloromethanesulfonyl)imide (Li-TFSI) into PP/GF composites. Li-TFSI was used as antistatic agents and MAPP was added as the interfacial binder between GF and PP matrix. It was found that the interface between PP and GF can be tuned by the binary addition of MAPP and L...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

An in-situ formable and fibrils-reinforced polysaccharide composite hydrogel by self-crosslinking with dual healing ability
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Bihua Ye, Shuyun Zhang, Riwang Li, Lihua Li, Lu Lu, Changren Zhou Novel in-situ formable and fibrils-reinforced polysaccharide-based composite hydrogels with dual healing ability were prepared by a facile, one-pot approach with maleilated chitosan (CS-MA) and thiol derivatised sodium alginate (SA-SH), via Michael addition reaction and ionic interaction. The unique fibrils network working as reinforcement fillers were attributed to the electrostatic interaction of CS-MA with SA-SH. This CS-MA/SA-SH composite hydrogel can self-hea...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Conducting α-Fe2O3 nanorod/polyaniline/CNT gel framework for high performance anodes towards supercapacitors
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Zhaokun Yang, Aidong Qiu, Jun Ma, Mingqing Chen Thick-electrode design toward high energy density per device is of particular importance for supercapacitors to store large amount of energy, but this remains a seemingly insurmountable challenge due to sluggish electron transport. The challenge is addressed herein by developing an electrically and ionically conducting framework which consists of α-Fe2O3 nanorods, multi-walled carbon nanotubes (CNTs) and polyaniline (PANi) hydrogel. The interconnecting composite framework is ...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Competing mechanisms in the unfolding failure in composite laminates
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): J.M. González-Cantero, E. Graciani, B. López-Romano, F. París Highly-curved laminates are prone to fail by delamination when they are loaded under a bending moment which tries to flatten the laminate. This failure, commonly called unfolding failure, has been traditionally associated with the tensile interlaminar stresses which appear in the laminate, due to its high curvature. However, some specimens failing by unfolding present a maximum interlaminar tensile stress, at the failure instant, much lower than o...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Dispersion of nanoparticles in polymer matrices with well-designed ligands as dispersant/emulsifier/comonomer
In this study, cationic ligand and anionic ligand were designed to serve as dispersant, emulsifier and comonomer in different stages of nanocomposites preparation. Commercial BaTiO3, TiO2, Ag and Al2O3 nanoparticles were incorporated and dispersed uniformly in polystyrene (PS) and polymethyl methacrylate (PMMA) matrices by designed cationic/anionic ligand. As dispersants, the sizes of nanoparticles aggregates were reduced from thousands of nanometers to dozens of nanometers by cationic/anionic ligand. Then ligands served as emulsifiers to prepare polymer nanocomposites. At the end of emulsion polymerization, the ligands co...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Thermoelectric and mechanical properties of PLA/Bi0 ·5Sb1·5Te3 composite wires used for 3D printing
Publication date: 22 March 2018 Source:Composites Science and Technology, Volume 157 Author(s): Jizhe Wang, Hongze Li, Rongxuan Liu, Liangliang Li, Yuan-Hua Lin, Ce-Wen Nan Thermoelectric (TE) composite wires with polylactic acid (PLA) as the matrix and Bi0·5Sb1·5Te3 (BST) as the filler are synthesized by extruding. The effects of silane coupling agent KH570, plasticizer ATBC, and conductive additive multi-walled carbon nanotubes (MWCNTs) on the composition, TE, and mechanical properties of the composite wires are systematically studied. It is necessary to add KH570 into the composite wires to make the actua...
Source: Composites Science and Technology - January 16, 2018 Category: Science Source Type: research

Toward biomimetic porous poly( ε-caprolactone) scaffolds: Structural evolution and morphological control during solid phase extrusion
Publication date: 1 March 2018 Source:Composites Science and Technology, Volume 156 Author(s): Hua-Mo Yin, Yan-Fei Huang, Yue Ren, Peng Wang, Baisong Zhao, Ji-Hua Li, Jia-Zhuang Xu, Zhong-Ming Li Two-dimensional oriented scaffolds bear spatial limitation to regenerate three-dimensional (3D) tissues despite showing the ability to guide cell alignment and elongation. By combining solid phase extrusion (SPE) of co-continuous blends with phase removal, we prepared an interconnected 3D porous poly(ε-caprolactone) (PCL) scaffold with oriented pores. To better regulate structure of these distinctive scaffolds, structural...
Source: Composites Science and Technology - January 10, 2018 Category: Science Source Type: research