Multifunctional graphene oxide paper embodied structural dielectric capacitor based on carbon fibre reinforced composites
In this study, the multifunctionality of structural dielectric capacitor made by integrating graphene oxide paper into carbon fibre reinforced composite has been investigated. The study is based on an earlier work on the use of graphene oxide for dielectric material in the structural dielectric capacitor, in which electrical properties have been characterized. In this work, an in-depth study on electrical and mechanical properties of this kind of structural dielectric capacitor have been carried out. In addition, the multifunctional efficiency of structural dielectric capacitors were evaluated and compared with existing st...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Evolution of structural, electrical, and mechanical response of 3D robust network and conducting mechanically modified glass fabric-polyester composites with devisable 1D VGCNF
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): T. Senthil, Nidhin Divakaran, Jianlei Wang, Rui Wang, Lixin Wu 3D robust network unsaturated polyester-glass fabric composites modified with varying amount VGCNF are prepared through combined hand lay-up techniques followed by a filtering membrane vacuum-assisted method. The electro-thermal-mechanical behaviors of the nanocomposites are studied. Critical nanofiller weight fraction is observed at which thermal and mechanical properties showed maximum enhancement. On the other hand, no such critical nanofiller weight fraction for ...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Stretchable and compressible strain sensor based on carbon nanotube foam/polymer nanocomposites with three-dimensional networks
In this study, a flexible strain sensor based on nanocomposites filled with three-dimensional carbon nanotube (CNT) foam was developed. CNT sample was prepared by using melamine-formaldehyde foam as a template, and the prepared material showed hydrophobic properties and the ability to spontaneously adsorb uncured polymer (polydimethylsiloxane) with excellent structural stability, thus ultimately eliminating the problems associated with the dispersion and re-agglomeration of CNTs in a polymer matrix. The flexible nanocomposite sensor showed excellent piezoresistivity under both compression and tension strain with high sensi...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Green lightweight lead-free Gd2O3/epoxy nanocomposites with outstanding X-ray attenuation performance
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Ly B.T. La, Christopher Leatherday, Yee-Kwong Leong, Harry P. Watts, Lai-Chang Zhang This work describes the design, preparation, and characterization of an environmentally friendly, clinically safe, and lightweight Gd2O3/epoxy nanocomposite (Gd nanocomposite) that can provide an alternative to traditional toxic lead (Pb)-based materials for diagnostic X-ray protection. Based on the effect of inter-particle forces, the adsorption of sodium dodecyl sulphate (SDS) surfactant on the surface of ultrafine ball milled Gd2O3 reduces th...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Mechanical properties of gelatin/polyacrylamide/graphene oxide nanocomposite double-network hydrogels
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Xiaoqiang Yan, Jia Yang, Feng Chen, Lin Zhu, Ziqing Tang, Gang Qin, Qiang Chen, Guangming Chen Gelatin/polyacrylamide/graphene oxide nanocomposite double-network hydrogels (Gelatin/PAAm/GO NC-DN gels) were prepared by in situ free radical polymerization. Their structure and properties were systematically characterized by X-ray diffraction (XRD), Raman spectroscopy, swelling experiments, scanning electron microscopy (SEM) and tensile tests. The results reveal that the GO nanosheets are significantly exfoliated in the gel matrix, ...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Determination of the strain-energy release rate of a composite laminate under high-rate tensile deformation in fibre direction
This study employed compact tension specimens consisting of IM7/8552 for dynamic testing on a split-Hopkinson tension bar system. Data reduction was based on the area method. The obtained strain-energy release rate for testing under high-rate conditions was determined to G I c , d y n f + = 82.0 ± 20.8 k J / m 2 , exhibiting a salient drop compared to its counterpart obtained under quasi-static loading ( G I c , Q S f + = 195.8 ± 18.0 k J / m 2 ). Analysis of the strain field surrounding the crack tip using digital image correlation (DIC) suggested a more extensive damage zone for testing under quasi-static t...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Mechanical properties of polypropylene by diversely compatibilizing with titanate whiskers in composites
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Xuechun Wang, Renfeng Song, Yinjie Chen, Yunhui Zhao, Kongying Zhu, Xiaoyan Yuan Isotactic polypropylene (PP)/titanate whisker composites were tailored by two component blends, in which PP and the titanate fillers were processed with maleic anhydride-grafted polypropylene (PP-g-MAH) and maleic anhydride-grafted polyethylene (PE-g-MAH) as compatibilizing agents, respectively. The whiskers modified with silica and 3-aminopropyl triethoxysilane ensured the hybrid interfacial conceivement, and the usages of the diverse compatibili...
Source: Composites Science and Technology - May 26, 2018 Category: Science Source Type: research

Fabrication and mechanical properties of CFRP composite three-dimensional double-arrow-head auxetic structures
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Xin-Tao Wang, Bing Wang, Zhi-Hui Wen, Li Ma In recent years, 3D structures with negative Poisson's ratio (auxetic) have attracted great interest. Many polymer and metal 3D auxetic structures have been manufactured using additive manufacturing technology, however composite 3D auxetic structures are rarely reported. Auxetic structures are normally of low stiffness which causes limitations on the structural applications of them. The specific stiffness and strength of auxetic structures can be significantly improved by making them...
Source: Composites Science and Technology - May 25, 2018 Category: Science Source Type: research

A novel stiffener skeleton strategy in catalytic carbonization system with enhanced carbon layer structure and improved fire retardancy
In this study, a stiffener skeleton strategy combined with catalyzing carbonization was proposed to improve the flame retardancy of polycarbonate (PC). The synergistic effect of nanosized carbon black (CB)/Ni2O3 on carbon yield and combustion properties of PC were investigated. An improvement with 31.4% in LOI, V0 in UL-94, and 50% reduction for PHRR in cone calorimeter test was achieved. According to char morphology and structure analysis, the flame retardancy mechanism was attributed to the enhanced barrier effect of carbon layer with interconnected structure and self-supporting capacity, which was promoted by the format...
Source: Composites Science and Technology - May 25, 2018 Category: Science Source Type: research

Aging resistant TiO2/silicone rubber composites
In this study, we are showing how to improve the resistance of the rubbers to extreme environmental aging by embedding TiO2 micro-particles. Molecular dynamics (MD) simulations were conducted to determine the combined effect of TiO2 and different concentrations of hydrophobic PDMS methyl groups on surface hydrophobicity of a TiO2/PDMS composite. In addition, the effects of both TiO2 and silica on the diffusivities of LV aqueous salt components in the PDMS were predicted and related to unique interfacial interactions between the particles and the methyl groups of the PDMS. Rutile TiO2 reoriented methyl groups away from the ...
Source: Composites Science and Technology - May 25, 2018 Category: Science Source Type: research

Anti-icing and de-icing coatings based Joule's heating of graphene nanoplatelets
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): O. Redondo, S.G. Prolongo, M. Campo, C. Sbarufatti, M. Giglio Epoxy coatings doped with graphene nanoplatelets (GNP) with average thickness close to 200 μm have been manufactured on glass fibre laminate substrate. Their electrical conductivity was close to 0.001–0.01 S/m because the GNP percentages added (8–12 wt% GNP) were higher than the electrical percolation threshold of this GNP/epoxy system. The electrical current increases exponentially with the applied voltage due to the self-heating of the samples...
Source: Composites Science and Technology - May 25, 2018 Category: Science Source Type: research

Self-healing, recoverable epoxy elastomers and their composites with desirable thermal conductivities by incorporating BN fillers via in-situ polymerization
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Xutong Yang, Yongqiang Guo, Xian Luo, Nan Zheng, Tengbo Ma, Jiaojun Tan, Chunmei Li, Qiuyu Zhang, Junwei Gu Thiol-epoxy elastomers were firstly prepared by thiol-epoxide nucleophilic ring-opening reaction, and the micron boron nitride (mBN) fillers were then introduced into the above system via in-situ polymerization, finally to prepare the highly thermally conductive, self-healing and recoverable mBN/thiol-epoxy elastomer composites by hot-pressing method. Results revealed that the thiol-epoxide reaction was highly efficient ...
Source: Composites Science and Technology - May 25, 2018 Category: Science Source Type: research

A bioinspired multilayer assembled microcrack architecture nanocomposite for highly sensitive strain sensing
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Zhenming Chen, Xuehui Liu, Shuman Wang, Xinxing Zhang, Hongsheng Luo Despite the wide applications of strain sensor in wearable devices and electronic skins, the poor flexibility, low sensitivity and repeatability, as well as the utilization of noxious agents dramatically restrict its large-scale application. Herein, a simple and efficient strategy is demonstrated to fabricate flexible, ultrahigh sensitive and reproducible strain-sensing platforms via an eco-friendly water-based layer-by-layer assembly method. Specifically, re...
Source: Composites Science and Technology - May 24, 2018 Category: Science Source Type: research

Synthesis of anhydrous manganese hypophosphite microtubes for simultaneous flame retardant and mechanical enhancement on poly(lactic acid)
In this study, a facile solvothermal approach for preparing anhydrous manganese hypophosphite (A-MnHP) microtubes was demonstrated for the first time by using manganese chloride and hypophosphorous acid in mixed solvents, followed by fabricating A-MnHP-based poly(lactic acid) (PLA) composites via a melt-blending method. Owing to the unique morphology of A-MnHP, the tensile strengths of the PLA composites with 1 wt%, 5 wt% and 10 wt% A-MnHP are approximately 17%, 7% and 3% higher than those of neat PLA, respectively. Compared to neat PLA, PLA composite containing 15 wt% A-MnHP (PLA/A-MnHP15) exhibited lower peak hea...
Source: Composites Science and Technology - May 24, 2018 Category: Science Source Type: research

Compatibilization of multicomponent composites through a transitioning phase: Interfacial tensions considerations
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): J.Justin Koh, Xiwen Zhang, Junhua Kong, Chaobin He A novel interfacial compatibilization technique for incompatible polymer blends or composites is proposed, in which a transitioning layer was introduced between the matrix and the dispersed phase of the otherwise incompatible components. The transitioning phase should have good interactions with both the components, resulting in lower interfacial energy between the phases. Theoretically, it is hypothesized that if the sum of the interfacial tension between the transitioning ph...
Source: Composites Science and Technology - May 23, 2018 Category: Science Source Type: research

Failure load prediction for fiber-reinforced composites based on acoustic emission
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Markus G.R. Sause, Stefan Schmitt, Sinan Kalafat In the design and quality control of fiber-reinforced structures, testing on coupon level and structure level are frequently carried out. In order to accept or reject a final product or material charge, means of quality control are carried out. In safety relevant structures, this is often based on holding a certain proof load. Acoustic emission is already used for the monitoring during proof load testing, but is only used for simple accept/reject diagnosis. For the accepted comp...
Source: Composites Science and Technology - May 23, 2018 Category: Science Source Type: research

Thermal, optical, interfacial and mechanical properties of titanium dioxide/shape memory polyurethane nanocomposites
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Shuang Shi, Dongya Shen, Tao Xu, Yuqing Zhang To further understand effects of titanium dioxide (TiO2) nanoparticles on thermal, optical, microstructural, interfacial and mechanical properties of shape memory polyurethane (SMPU), TiO2/SMPU nanocomposites with different TiO2 contents were synthesized. Then various properties of TiO2/SMPU nanocomposites were characterized. Results indicate that the melting temperature of soft segments in SMPU can be used as the shape memory transition temperature of TiO2/SMPU nanocomposites. TiO...
Source: Composites Science and Technology - May 23, 2018 Category: Science Source Type: research

Flexible and self-assembly anisotropic FeCo nanochain-polymer composite films for highly stretchable magnetic device
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Jie Yuan, Zhi-Quan Liu Magnetic field induced self-assembly is used to successfully fabricate flexible and anisotropic FeCo nanochain-PDMS composite films. The embedded nanochains are controllable in average length (<200 μm) and width (<2 μm) through optimizing the filler mass fraction and the magnetic field intensity, and an ultra-high aspect ratio of 150 can be achieved. In-situ observations on the growth of a 600 μm long nanochain verify the connection and coarsening mechanism. The composite fil...
Source: Composites Science and Technology - May 23, 2018 Category: Science Source Type: research

A novel approach to align carbon nanotubes via water-assisted shear stretching
Publication date: 18 August 2018 Source:Composites Science and Technology, Volume 164 Author(s): Yingying Yu, Changhao Zhao, Qingwen Li, Jianying Li, Yuntian Zhu Floating catalyst chemical vapor deposition (FCCVD) can produce buckypaper, a kind of CNT film, at large-scale with low cost. However, individual CNTs in the buckypaper are mostly randomly oriented, which significantly limits their electrical and mechanical properties. Here we report an innovative approach, water-assisted shear stretching (WASS), which can significantly improve CNT alignments and consequently enhance the electrical and mechanical properties. In a...
Source: Composites Science and Technology - May 23, 2018 Category: Science Source Type: research

Synchrotron X-ray scattering and IR-mapping studies of wet-spun lignin-derived carbon fibre precursor
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Azam Oroumei, Peter Lynch, Mark Tobin, Minoo Naebe Lignin in a blend with polyacrylonitrile (PAN) was wet-spun in various processing conditions with the aim of identifying the most influential wet-spinning parameters on the properties of lignin/PAN fibres. Morphological, chemical, and structural properties of wet-spun lignin/PAN fibres were investigated by Scanning Electron Microscopy (SEM), synchrotron Infrared Microspectroscopy (IR-mapping), and synchrotron Wide-Angle X-ray Scattering (WAXS). Although the highest concentration...
Source: Composites Science and Technology - May 18, 2018 Category: Science Source Type: research

Mechanical properties of polypropylene composites reinforced by hydrolyzed and microfibrillated Kevlar fibers
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Sirui Fu, Bowen Yu, Wei Tang, Mao Fan, Feng Chen, Qiang Fu As a traditional general plastic, polypropylene (PP) has been widely used in daily life. Glass fibers are often used to further reinforce the properties of PP for its application in engineering area. However, there are still some drawbacks existing for glass fibers filled polypropylene composites, such as high filler content, easy fracture of glass fibers and damage to the machines during processing. Therefore, organic fibers are considered as an ideal candidate to repla...
Source: Composites Science and Technology - May 18, 2018 Category: Science Source Type: research

Cellulose-carbon nanotube composite aerogels as novel thermoelectric materials
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Minoj Gnanaseelan, Yian Chen, Jinji Luo, Beate Krause, Jürgen Pionteck, Petra Pötschke, Haisong Qi Thermoelectric materials based on cellulose/carbon nanotube (CNT) nanocomposites have been developed by a facile approach and the effects of amount (2–10 wt%) and types of CNTs (single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs)) on the morphology (films and aerogels) and the thermoelectric properties of the nanocomposites have been investigated. Composite films based on SWCNTs show...
Source: Composites Science and Technology - May 18, 2018 Category: Science Source Type: research

Smart composites of piezoelectric particles and shape memory polymers for actuation and nanopositioning
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Hairong Chen, Hong Xia, Yiping Qiu, Zhenzhen Xu, Qing-Qing Ni To combine the piezoelectric effect and shape memory effect, various kinds of smart composites are developed through compounding lead zirconate titanate (PZT) particles with average diameters of 400 nm and shape memory polyurethane (SMPU) matrices. Compared with pristine SMPU, the resulting composites are enhanced by more than 133% in the maximum recovery stresses. Additionally, the film actuators made from these composites can generate 1 nm resolution displacemen...
Source: Composites Science and Technology - May 18, 2018 Category: Science Source Type: research

Effect of functional groups on the agglomeration of graphene in nanocomposites
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Zheling Li, Jingwen Chu, Cheng Yang, Sijia Hao, Mark A. Bissett, Ian A. Kinloch, Robert J. Young A base wash procedure was used to partially remove the oxygen functional groups from the graphene oxide (GO) flakes to prepare the base-washed GO (BwGO). It is found that the base wash treatment does not alter the physical properties (size, thickness etc.) of the GO significantly but the chemical composition is changed. Nanocomposites were prepared by incorporating the BwGO flakes obtained in a poly(vinyl alcohol) (PVA) matrix. It wa...
Source: Composites Science and Technology - May 18, 2018 Category: Science Source Type: research

Analyzing effects of interfaces on recovery rates of shape memory composites from the perspective of molecular motions
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Hairong Chen, Hong Xia, Yiping Qiu, Qing-Qing Ni Over recent years, researchers have noticed that recovery rates of shape memory composites (SMCs) would vary due to the addition of fillers. So far, although several superficial reasons are discussed, a thorough analysis has not been presented yet probably due to the absence of a microscopic mechanism of SMCs. Here, a molecular mechanism of SMCs is clarified by identifying the differences lying in molecular motions of shape memory polymers and SMCs. On the basis of the molecular m...
Source: Composites Science and Technology - May 18, 2018 Category: Science Source Type: research

Electrospun nanofibres as a tool for controlling the gas bubble size distribution in fibre/thermoset-matrix composites
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): R. Polanský, P. Prosr, M. Zemanová, J. Pihera, T. Džugan, J. Chvojka The influence of electrospun nanofibres made from polyamide 6 (PA6) on the gas bubble size distribution by volume in fibre/thermoset-matrix systems cured without a vacuum was comprehensively studied via various methods. An analysis of the microstructural, thermal and dielectric properties proved that the unique structure of PA6 electrospun nanofibres can withstand the curing conditions required for fibre/thermoset-matrix systems and that the over...
Source: Composites Science and Technology - May 17, 2018 Category: Science Source Type: research

Largely enhanced dielectric and thermal conductive properties of novel ternary composites with small amount of nanofillers
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Weiyan Li, Zhongqian Song, Jing Qian, Zhongyang Tan, Huiying Chu, Xianyou Wu, Wei Nie Polymer-based composites with excellent dielectric and thermal conductive properties attract ever-increasing attentions from researchers due to the irreplaceable role in energy storage system and electrical devices. Herein, poly(vinylidene fluoride) (PVDF)-based ternary composites were fabricated by adding small amount of poly(dopamine) coated boron nitride (DBN) and electrochemical exfoliated graphene (EEG) into PVDF matrix. Due to the high de...
Source: Composites Science and Technology - May 14, 2018 Category: Science Source Type: research

Styrenic block copolymer/sulfonated graphene oxide composite membranes for highly bendable ionic polymer actuators with large ion concentration gradient
In this study, sulfonated graphene oxide (sGO) with a large enhanced sulfonation degree of 1.65 mmol g−1 was simultaneously introduced as a highly ion conduction-activating carbonaceous filler for ionic polymer–metal composite (IPMC) actuator. The nanostructured styrenic block copolymer/sGO/ionic liquid (IL) composite membrane actuators revealed much larger actuation performance than top-ranked polyelectrolyte/IL actuators ever reported so far in terms of bending strain (0.88% under 2 V dc), initial strain rate (0.312% min−1), and charge-specific displacement (276.4 mm C−1). Moreover, SSPB...
Source: Composites Science and Technology - May 12, 2018 Category: Science Source Type: research

Dielectric response of nano aluminium tri-hydrate filled silicone rubber
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Chao Wu, Xidong Liang, Leonard A. Dissado, Nikola M. Chalashkanov, Stephen J. Dodd, Yanfeng Gao, Sen Xu The dielectric response of a nano-ATH (Aluminium Tri-hydrate) filled silicone rubber is investigated over the frequency range 10−4 to 103 Hz and compared with that of the micro-ATH composite. An equivalent circuit has been used to decompose the dielectric response into: a loss peak process, a quasi-dc (Q-DC) process, a dc-conductance and constant high frequency capacitance. It was found that the Q-DC and loss peak were...
Source: Composites Science and Technology - May 11, 2018 Category: Science Source Type: research

Synergistic effect of flame retardants and carbon nanotubes on flame retarding and electromagnetic shielding properties of thermoplastic polyurethane
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Xiaoying Ji, Dayong Chen, Qingwen Wang, Jiabin Shen, Shaoyun Guo Thermoplastic polyurethane (TPU)-based composites filled with carbon nanotubes (CNTs) and intumescent flame retardants (IFRs) were fabricated through melt compounding method. For comparison, TPU/IFR and TPU/CNT composites with different filling proportions were prepared, respectively. The results presented that the addition of 1 wt% CNTs and 10 wt% IFRs into TPU could achieve good flame retarding and electromagnetic interference (EMI) shielding properties simul...
Source: Composites Science and Technology - May 11, 2018 Category: Science Source Type: research

Methodology for macro-modeling of bio-based composites with inelastic constituents
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Liva Pupure, Janis Varna, Roberts Joffe Methodology for development of a macro-scale model (with strain as an input) for Regenerated Cellulose fiber (RCF) composites with highly non-linear (viscoelastic (VE) and viscoplastic (VP)) constituents is presented and demonstrated. The VE is described by Schapery's models and Zapas' model is used for VP. For a purely VE constituent the model can be identified from stress relaxation in constant strain tests. In the presence of VP the constant strain test does not render VE stress relaxat...
Source: Composites Science and Technology - May 11, 2018 Category: Science Source Type: research

Effects of degree of chemical interaction between carbon fibers and surface sizing on interfacial properties of epoxy composites
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Qing Wu, Ruyi Zhao, Quansheng Ma, Jianfeng Zhu This paper offers a simple approach to increase the interfacial bonding strength of carbon fiber/epoxy composites by optimizing the degree of chemical interaction among functional groups of fiber surface, sizing agent and resin via heat treatments on carbon fibers. 130 °C treatment on CF1 and 150 °C treatment on CF2 results respectively 71.1% and 15.1% improvements on interfacial shear strength (IFSS), as compared with untreated CF1 and CF2 composites. Variations of IFSS...
Source: Composites Science and Technology - May 11, 2018 Category: Science Source Type: research

Enhanced interfacial and mechanical properties of high-modulus carbon fiber composites: Establishing modulus intermediate layer between fiber and matrix based on tailored-modulus epoxy
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Peng Xu, Yunhua Yu, Dawei Liu, Mei He, Gang Li, Xiaoping Yang Tailored-modulus epoxy matrix was designed on basis of surface analysis of high-modulus carbon fibers (HMCF), and the effects of modulus intermediate layer on interfacial and mechanical properties of HMCF composites were investigated. Narrow grooves and active functional groups were detected on HMCF surface. The modulus of epoxy was tuned by stiff organic molecular structure of cycloaliphatic epoxy (CE) and amide acid (AA). Modulus intermediate layer was established a...
Source: Composites Science and Technology - May 11, 2018 Category: Science Source Type: research

Modelling the electrical resistance change in a multidirectional laminate with a delamination
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Francesco Panozzo, Michele Zappalorto, Lucio Maragoni, Stefan Klaus Nothdurfter, Axel Rullo, Marino Quaresimin In this work, the electrical response of a multidirectional symmetric composite laminate with a delamination is studied analytically, numerically and experimentally. An analytical model is initially developed to predict the electrical resistance of the composite laminate as a function of the delamination extent. The model was first validated against the results of a bulk of finite element analyses, considering different ...
Source: Composites Science and Technology - May 10, 2018 Category: Science Source Type: research

Bridging the segregated structure in conductive polypropylene composites: An effective strategy to balance the sensitivity and stability of strain sensing performances
In this study, the design of a segregated carbon black (CB) conductive network was demonstrated to be crucial for preparing polypropylene (PP)-based strain sensors with fine recoverability and stability, but a low sensitivity. The incorporation of carbon fibers (CFs) with large aspect ratio into the segregated CB/PP was utilized to build a bridged-segregated structure, leading to a synergistic conductive network. As a result, an improved sensitivity as well as a good stability was both achieved for the CF/CB/PP composite. The origin of these results was further explained on the basis of the tunneling model proposed by Simm...
Source: Composites Science and Technology - May 10, 2018 Category: Science Source Type: research

The use of a pilot-scale continuous paper process for fire retardant cellulose-kaolinite nanocomposites
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): D.O. Castro, Z. Karim, L. Medina, J.-O. Häggström, F. Carosio, A. Svedberg, L. Wågberg, D. Söderberg, L.A. Berglund Nanostructured materials are difficult to prepare rapidly and at large scale. Melt-processed polymer-clay nanocomposites are an exception, but the clay content is typically below 5 wt%. An approach for manufacturing of microfibrillated cellulose (MFC)/kaolinite nanocomposites is here demonstrated in pilot-scale by continuous production of hybrid nanopaper structures with thickness of around 10...
Source: Composites Science and Technology - May 8, 2018 Category: Science Source Type: research

Multi-scale design of electromagnetic composite metamaterials for broadband microwave absorption
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Yixing Huang, Wei-Li Song, Changxian Wang, Yuannan Xu, Weiyi Wei, Mingji Chen, Liqun Tang, Daining Fang The microwave absorbing composites embedded with magnetic-dielectric lossy components including spherical carbonyl iron (CI) and multi-wall carbon nanotubes (MWCNT) were fabricated by a two-step molding method. By manipulating the content of CI and MWCNT for adjusting complex permittivity and permeability, the as-prepared composites were used to optimize the electromagnetic composite metamaterials (ECMs) for broadband absorptio...
Source: Composites Science and Technology - May 8, 2018 Category: Science Source Type: research

Self-reinforced biodegradable Mg-2Zn alloy wires/polylactic acid composite for orthopedic implants
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Hong Cai, Yue Zhang, Xuan Li, Jiao Meng, Feng Xue, Chenglin Chu, Li Tao, Jing Bai Biodegradable composite rods with polylactic acid as matrix and Mg-2Zn wires as the reinforcement body were prepared by hot press and hot drawn method in this article. The main purpose is to improve the mechanical properties based on the strengthen and toughness effect of the directionally distributed Mg-2Zn wires in PLA matrix and the improved interfacial bonding strength by MAO treated Mg-2Zn wires as well as the self-reinforcement effect of PLA a...
Source: Composites Science and Technology - May 8, 2018 Category: Science Source Type: research

Nonlinear viscoelasticity of pre-compressed layered polymeric composite under oscillatory compression
In this study, we utilize two methods, Fourier transform and geometrical nonlinear analysis, to quantitatively characterize the nonlinear viscoelasticity of a pre-compressed layered polymeric composite under oscillatory compression. We discuss the influences of pre-compression, dynamic loading, and the inner structure of polymeric composite on the nonlinear viscoelasticity. Furthermore, we reveal the nonlinear viscoelastic mechanism by combining with other experimental results from quasi-static compressive tests and microstructural analysis. From a methodology standpoint, it is proved that both Fourier transform and geomet...
Source: Composites Science and Technology - May 8, 2018 Category: Science Source Type: research

Controlling the structure of arborescent carbon nanotube networks for advanced rubber composites
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Kazufumi Kobashi, Seisuke Ata, Takeo Yamada, Don N. Futaba, Kenji Hata We propose a method for controlling the arborescent structure of long carbon nanotubes (CNTs) to harness their intrinsic properties in advanced rubber composites. Our method of structural control was based on a wet-jet mill to vary the shear forces (20–150 MPa) applied to aligned single-wall CNTs in solution. As the pressure of jet mill increased, the resulting suspended CNTs changed from agglomerates of bundled “trunk”-like structures to ...
Source: Composites Science and Technology - May 8, 2018 Category: Science Source Type: research

Smart-fabric sensor composed of single-walled carbon nanotubes containing binary polymer composites for health monitoring
Publication date: 28 July 2018 Source:Composites Science and Technology, Volume 163 Author(s): Shahid Aziz, Seung-Hwan Chang A smart-fabric sensor for health monitoring has been fabricated using composite of single-walled carbon nanotubes (SWCNTs)-filled binary polymer of poly vinylidene fluoride/poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PVDF/PEDOT:PSS). The response curves and working principle were investigated, and sensors were fabricated to achieve a highly linear and stable response for a wide range of temperatures (25–100 °C) and bending angles. The sensors show a stable and nearly linea...
Source: Composites Science and Technology - May 8, 2018 Category: Science Source Type: research

BaTiO3@carbon/silicon carbide/poly(vinylidene fluoride-hexafluoropropylene) three-component nanocomposites with high dielectric constant and high thermal conductivity
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Xianhong Zhang, Cheng Tan, Yuhong Ma, Fang Wang, Wantai Yang This work reports a new three-component composite which is consisted of dielectric carbon coated barium titanate hybrid particles (BT@C), thermal conductive silicon carbide nanoparticles (SiC NPs), and flexible poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP). The BT@C is synthesized via hydrothermal reaction of BT nanoparticles with glucose and further carbonized at 800 °C. The TEM images and Raman spectra reveal that the structure of carbon coating layer...
Source: Composites Science and Technology - May 7, 2018 Category: Science Source Type: research

Magnet-induced aligning magnetorheological elastomer based on ultra-soft matrix
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Junru Yao, Youyi Sun, Yan Wang, Qiang Fu, Zhiyuan Xiong, Yaqing Liu A novel magnet-induced aligning magnetorheological elastomer (MIMRE) based on ultra-soft polymeric matrix was prepared through an innovative synthetic approach, enables the magnetic particles to mobile and align in elastomer matrix under magnetic field at room temperature. The effect of polymeric matrix modulus on the formation of MIMRE was investigated in detail. It was found that the MIMRE showed excellent magnetorheological (MR) effect, and the absolute and re...
Source: Composites Science and Technology - May 6, 2018 Category: Science Source Type: research

Novel carbon-poly(silacetylene) composites as advanced thermal protection material in aerospace applications
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Lei Kong, Xiaobiao Zuo, Shipeng Zhu, Zhongping Li, Jianjun Shi, Long Li, Zhihai Feng, Dahai Zhang, Daiying Deng, Jijun Yu In the present work, a new class of 2.5D woven carbon-poly(silacetylene) composites derived from three novel poly(silacetylene) resins has been developed by VARTM process and evaluated to determine the potential for serving as advanced thermal protection material. TG analysis, PGC-MS analysis, Ar arc plasma ablation test, microstructural analysis and a ATCM have been employed to investigate the effects of chem...
Source: Composites Science and Technology - May 6, 2018 Category: Science Source Type: research

Anisotropic meanfield modeling of debonding and matrix damage in SMC composites
Publication date: 16 June 2018 Source:Composites Science and Technology, Volume 161 Author(s): Malte Schemmann, Johannes Görthofer, Thomas Seelig, Andrew Hrymak, Thomas Böhlke This paper presents an anisotropic, micromechanical damage model for sheet molding compound (SMC) composites, that is a thermoset matrix reinforced with long ( ≈ 25 mm ) glass fibers. The model captures the dominant damage mechanisms – matrix damage and fiber-matrix interface debonding – in a Mori-Tanaka homogenization framework. Matrix damage is modeled as a phase-averaged isotropic stiffness degradation. The interface d...
Source: Composites Science and Technology - May 3, 2018 Category: Science Source Type: research

Dispersion of graphene in chlorosulfonated polyethylene by slurry compounding
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Zhijun Yang, Zongchao Xu, Liqun Zhang, Baochun Guo It remains a huge challenge to realize the homogeneous graphene dispersion in elastomer matrix by a simple and general compounding method. Herein, we develop a straightforward slurry compounding method for preparation of rubber/graphene composites with well-dispersed graphene. Specifically, TPG (tea polyphenol reduced graphene)/ethanol slurry was first collected by solvent exchange after the reduction of graphene oxide by tea polyphenol and then directly melt compounded with chlo...
Source: Composites Science and Technology - May 2, 2018 Category: Science Source Type: research

Identifying interphase properties in polymer nanocomposites using adaptive optimization
The objective is to minimize the difference between the predicted bulk property of a nanocomposite with that from the experiment data. A Gaussian Process (GP) model is built as a surrogate of the objective function with quantification of prediction uncertainty. An adaptive sampling strategy is applied to effectively navigate the complex search space by iteratively selecting the next sampling point based on an expected improvement function. The surrogate model and the optimal solution evolve until the desired objective is achieved. The approach is tested on both the simulations of dielectric and viscoelastic properties in n...
Source: Composites Science and Technology - May 2, 2018 Category: Science Source Type: research

Synergistic effect of chitin nanocrystals and orientations induced by solid-state drawing on PLA-based nanocomposite tapes
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Anshu Anjali Singh, Jiayuan Wei, Natalia Herrera, Shiyu Geng, Kristiina Oksman Uniaxial solid-state drawing was used to orientate plasticized polylactic acid (PLA) and its nanocomposite tapes with 1 and 5 wt% chitin nanocrystals (ChNC). Microscopy studies confirmed the orientation and formation of a ‘shish-kebab’ morphology in the drawn tapes. The mechanical properties demonstrated that the drawing led to stronger and tougher nanocomposites compared to plasticized PLA. The tensile strength increased from 41 MPa to...
Source: Composites Science and Technology - May 1, 2018 Category: Science Source Type: research

Self-assembled montmorillonite –carbon nanotube for epoxy composites with superior mechanical and thermal properties
Publication date: 7 July 2018 Source:Composites Science and Technology, Volume 162 Author(s): Shaohua Zeng, Mingxia Shen, Lu Yang, Yijiao Xue, Fengling Lu, Shangneng Chen A hybrid nanostructure consisting of montmorillonite−multi-walled carbon nanotube (Mt−MWCNT) was designed and assembled, and further used as reinforcing nanofillers for preparing epoxy-based composites. It was found that Mt could efficiently resist microcrack extension and hinder thermal transfer while MWCNTs anchored on the Mt nanosheets could facilitate the stress and heat transfers and provide mechanical interlocking with the epoxy matrix....
Source: Composites Science and Technology - May 1, 2018 Category: Science Source Type: research

Natural rubber particle modified fabrics with catalytic activity and hydrophobicity
We report a novel and facile approach to fabricate functional fabrics using environment-friendly waterborne natural rubber latex (NRL) containing in-situ synthesized gold nanoparticles (AuNPs). AuNPs were prepared and decorated on the surface of the natural rubber particles (NRPs) by heating, forming a dual-scale hierarchical architecture. The hybrid particles of NRPs and AuNPs (AuNP@NRP) were coated on cotton and hydrophilic polyester fabric surfaces, endowing the fabrics with catalytic and hydrophobic features. The treated fabrics with low loadings of AuNP@NRP exhibited high catalytic activity for the reduction of 4-nitr...
Source: Composites Science and Technology - May 1, 2018 Category: Science Source Type: research