Hybrid polysiloxane/polyacrylate/nano-SiO2 emulsion for waterborne polyurethane coatings
Publication date: Available online 16 September 2019Source: Polymer TestingAuthor(s): Weibin Jiang, Anqi Dai, Tao Zhou, Huasheng XieAbstractA hybrid polysiloxane/polyacrylate/nano-SiO2 emulsion, as a component in the formula of waterborne polyurethane coatings, was synthesized by multi-step modification. The hybrid emulsion was characterized by Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric analysis (TGA), particles size distribution analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The water absorption and hardness of films were investigated. The results showed t...
Source: Polymer Testing - September 18, 2019 Category: Chemistry Source Type: research

The polymeric ionic liquids/mesoporous alumina composites: Synthesis, characterization and CO2 capture performance test
Publication date: Available online 14 September 2019Source: Polymer TestingAuthor(s): Yingying Zhou, Mingfeng Chang, Xiyu Zang, Lan Zheng, Yuqi Wang, Le Wu, Xiaolong Han, Yuqing Chen, Yunsong Yu, Zaoxiao ZhangAbstractThe CO2 capture materials and technology have received much attention in recent years due to the environmental deterioration caused by the greenhouse gas emissions. Several imidazolium polymeric ionic liquids (PILs) were synthesized and immobilized on mesoporous γ-Al2O3 (MA) using ultrasonic immersion method. The prepared adsorbents were characterized by FT-IR, 1H NMR, EA, TGA, SEM, XRD, BET and TEM, ind...
Source: Polymer Testing - September 15, 2019 Category: Chemistry Source Type: research

Hydrolytic degradation and lifetime prediction of poly(lactic acid) modified with a multifunctional epoxy-based chain extender
Publication date: Available online 14 September 2019Source: Polymer TestingAuthor(s): Wanwarang Limsukon, Rafael Auras, Susan SelkeAbstractThe effect of adding chain extender (Cex) during the production of poly (lactic acid) (PLA) films on the hydrolytic degradation of the films was evaluated at temperatures from 40 to 95 °C. The hydrolytic degradation of PLA–Cex film estimated using the Pan model was significantly lower than that of neat PLA film (PLA–Con) at all temperature conditions. The Vogel-Tammann-Fulcher and Williams-Landel-Ferry models were used to study the hydrolytic degradation of the PLA fil...
Source: Polymer Testing - September 15, 2019 Category: Chemistry Source Type: research

A comparative study of two graphene based elastomeric composite sensors
Publication date: Available online 11 September 2019Source: Polymer TestingAuthor(s): Sensen Han, Qingshi Meng, Aron Chand, Shuo Wang, Xiaodong Li, Hailan Kang, Tianqing LiuAbstractFlexible and stretchable multifunctional electronics is expected to be one of the most active research areas in the next decade. In this work, we fabricate graphene based flexible film sensors using two different matrices; polydimethylsiloxane (PDMS) and epoxy. A graphene platelet (GnP) refers to a nanosheet that consists of a few stacked graphene layers, mostly below ∼10 nm in thickness. The mechanical, electrical and thermal properties o...
Source: Polymer Testing - September 13, 2019 Category: Chemistry Source Type: research

Magneto-elastic properties of isotropic MR elastomers with a tri-modal particle size distribution
This study provides a convenient approach for the investigation of the mechanical properties and behavior of such soft magnetic composites for use in engineering applications. (Source: Polymer Testing)
Source: Polymer Testing - September 13, 2019 Category: Chemistry Source Type: research

Fabrication of a novel hierarchical fibrous scaffold for breast cancer cell culture
Publication date: Available online 11 September 2019Source: Polymer TestingAuthor(s): Honglin Luo, Teng Cui, Deqiang Gan, Miguel Gama, Quanchao Zhang, Yizao WanAbstractScaffolds combining nano- and submicro-fibers closely mimicking extracellular matrix (ECM) have been poorly exploited for in vitro cancer cell culture. Herein, a combined electrospinning and modified in situ biosynthesis method has been developed to fabricate a novel scaffold consisting of bacterial cellulose (BC) nanofibers and electrospun cellulose acetate (CA) submicrofibers to mimic the fibrillar structure of natural ECM. The CA/BC nano/submicrofibrous s...
Source: Polymer Testing - September 13, 2019 Category: Chemistry Source Type: research

Effect of high pressure laminate residue on the mechanical properties of recycled polypropylene blends
Publication date: Available online 10 September 2019Source: Polymer TestingAuthor(s): Pamela Galera Prestes Pires, Amanda Alves Domingos Maia, Jane Maria Faulstich de PaivaAbstractBlends using raw materials from industrial waste were molded. As thermoplastic matrix was used recycled polypropylene (PP), a type of residue containing thermosetting powder from high-pressure laminate (HPL) was used as filler and epoxidized soybean oil (ESO) was also utilized. In order to evaluate the mechanical and thermal properties were performed tensile, flexural, Charpy impact tests, softening point temperature (Vicat), heat deflection temp...
Source: Polymer Testing - September 11, 2019 Category: Chemistry Source Type: research

A new approach for the shaping up of very fine and beadless UV light absorbing polycarbonate fibers by electrospinning
Publication date: Available online 7 September 2019Source: Polymer TestingAuthor(s): Thomas Baby, Tomlal Jose E, Gejo George, Vinitha Varkey, Shijo K. CherianAbstractAn innovation will be recognized as successful only if it satisfies all phases of product development; i.e. from the specification to mass production. Therefore, a cost-effective production by keeping the best possible characteristics is vital in any Industry. Large scale production of polymer fibers with ultrafine morphology is such a challenge to in the field of nanotechnology. The idea proposed here utilizes the versatile electrospinning technology for the ...
Source: Polymer Testing - September 8, 2019 Category: Chemistry Source Type: research

A sterile self-assembled sericin hydrogel via a simple two-step process
In this study, a novel self-assembled sericin hydrogel was prepared by a simple-two-step process containing milling and high temperature and high pressure. It is worthwhile pointing out that the sericin with high extraction rate (95%) for fabricating sericin hydrogel was isolated from fibroin-deficient mutant silk cocoons. The hydrogel was formed under a mild condition without introducing any other toxic or harmful substances and its gelling time could be controlled by sericin concentration, temperature or pH values. Moreover, as long as the sericin solution is kept in a bioclean circumstance, the sterile sericin hydrogel ...
Source: Polymer Testing - September 8, 2019 Category: Chemistry Source Type: research

Surface response and photodegradation performance of bio-based polyurethane-forest derivatives foam composites
In this study, four different forest-based wastes (wood, bark, kraft lignin and paper sludge) were incorporated into rigid PU foams and their surface response and photodegradation resistance were investigated. The rigid foams were prepared via free rise pouring method and later aged by UV radiation. Their colour and specular gloss were evaluated according to the CIELab method. Contact angle measurements and morphological characterization by optical (OM) and scanning electron microscopy (SEM) were also carried out. The forest-based fillers induced different colour patterns on the rigid foams and their photodegradation yield...
Source: Polymer Testing - September 7, 2019 Category: Chemistry Source Type: research

Influence of sodium bicarbonate treatment on the aging resistance of natural fiber reinforced polymer composites under marine environment
Publication date: Available online 5 September 2019Source: Polymer TestingAuthor(s): V. Fiore, C. Sanfilippo, L. CalabreseAbstractAim of the current study is to investigate how an innovative and eco-friendly chemical treatment based on sodium bicarbonate solution (10 wt%) can improve the aging resistance in marine environment of epoxy based composites, reinforced with flax and jute fibers. To this scope, treated and untreated fiber reinforced composites were manufactured through vacuum infusion technique. The resulting composites were then exposed to salt-fog spray conditions up to 60 days, according to ASTM B117 standar...
Source: Polymer Testing - September 6, 2019 Category: Chemistry Source Type: research

Investigation on dielectric breakdown behavior of thermally aged cross-linked polyethylene cable insulation
Publication date: Available online 5 September 2019Source: Polymer TestingAuthor(s): Chonung Kim, Pingkai Jiang, Fei Liu, Songchol Hyon, Myong-guang Ri, Yongmyong Yu, Myongsong HoAbstractWith the rapid development of industry and the increasing demand of power supply, the rated voltage class and current-carrying capacity of power cables become higher and higher, causing the severer service and testing conditions for high voltage (HV) power cables. Therefore, the requirement of the quality of cable insulating materials also becomes increasingly higher. The dielectric breakdown strength is one of the most important indices c...
Source: Polymer Testing - September 6, 2019 Category: Chemistry Source Type: research

Effect of phenyl content, sample thickness and compression on damping performances of silicone rubber: A study by dynamic mechanical analysis and impact damping test
Publication date: Available online 6 September 2019Source: Polymer TestingAuthor(s): Fengmei Yu, Ai Lu, Junliang Lu, Zhiyong Wang, Qian Zhang, Chengzhen Geng, Zhongming LiAbstractThe relaxation behaviors and impact damping effects of phenyl silicone rubber were investigated using dynamic mechanical analysis (DMA) and a home-designed impact damping test. The effects of rubber phenyl content, sample thickness and compression on the damping performance were evaluated. DMA results over a broad temperature and frequency range indicate that silicone rubber with higher phenyl content would overall exhibit better damping capacity ...
Source: Polymer Testing - September 6, 2019 Category: Chemistry Source Type: research

Creep deformation behavior of polymer materials with a 3D random pore structure: Experimental investigation and FEM modeling
This study investigates the creep deformation behavior of polyvinylidene difluoride (PVDF) with a 3D random pore structure. The test sample was a hollow fiber polymeric membrane with sub-micron-sized pores and an open cellular structure, which plays a critical role for water purification. Uniaxial tensile test was carried out for the polymeric membrane and it was found that the membranes underwent elasto-plastic deformation and creep deformation. In order to establish a numerical model, the finite element method (FEM) was employed. Using the Surface Evolver software, a 3D random pore structure was created in the representa...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Photorheology of bioadhesive dendrimer polycaprolactone composites
Publication date: Available online 3 September 2019Source: Polymer TestingAuthor(s): Gautama Wicaksono, Ivan Djordjevic, Ankur Shah, Terry W.J. SteeleAbstractToxicity, low adhesion strength, and complexity of application are the major challenges that prevent utilization of synthetic surgical adhesives. To address this challenge, a platform of fully synthetic UVA curing bioadhesive composites are evaluated on the binary composites consisting of polyamidoamine (PAMAM) grafted with aryl-diazirine (PAMAM-g-diazirine, PDz) and multi-arm polycaprolactone triols (PCLT). PCLT is chosen as a bioresorbable polymer matrix that serves...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Extraction of plasticizers: An entire and reproducible quantification method for historical cellulose acetate material
Publication date: Available online 3 September 2019Source: Polymer TestingAuthor(s): Benjamin Kemper, Dirk Andreas LichtblauAbstractPlasticizers from historical artefacts made of cellulose acetate were extracted and quantified. In compare to common procedures the presented method led to an entire and reproducible extraction which can even be performed in a much shorter time. The success of the improved procedure is based on the use of ultrasonic sound, methanol as solvent and multiple extraction steps for a complete removal of the plasticizers. The procedure was developed for small amounts of different types of products ma...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Development of a rapid micro-Raman spectroscopy approach for detection of NIAS in LDPE pellets and extruded films for food packaging applications
Publication date: Available online 3 September 2019Source: Polymer TestingAuthor(s): Chiara Portesi, Davide Visentin, Francesca Durbiano, Maria Cesarina Abete, Marco Rizzi, Valter Maurino, Andrea Mario RossiAbstractIdentification and quantification of Non Intentionally Added Substances (NIAS) at low concentrations and eventually their distribution on Low Density Polyethylene (LDPE) films is an important issue. As Raman spectroscopy techniques are innovative and sensitive analytical methods and do not require pretreatment and manipulation of the sample, these were used for the identification of NIAS in LDPE pellet and films...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

A hybrid mathematical modeling strategy for controlling the mechanical performance of polyethylene/poly(ethylene-co-vinyl acetate)/Nanoclay cast films
Publication date: Available online 26 August 2019Source: Polymer TestingAuthor(s): Reza Ghasemi, Farkhondeh Hemmati, Alireza Shadman, Mohammad Reza Saeb, Jamshid Mohammadi-Roshandeh, Tara Farizeh, As'ad ZandiAbstractA mathematical modeling approach based on the capabilities of response surface methodology (RSM) and desirability function (DF) was applied in the extrusion of polyethyelene (PE)/ethylene-vinyl acetate copolymer (EVA)/nanoclay (NC) cast films to optimize the mechanical performance with multiple targets. On the basis of RSM, a series of experiments were designed and the effects of material parameters and process...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Distributed fiber-optic strain sensing with millimeter spatial resolution for the structural health monitoring of multiaxial loaded GFRP tube specimens
Publication date: Available online 27 August 2019Source: Polymer TestingAuthor(s): Dorit Munzke, David Kraus, René Eisermann, Stefan Kübler, Marcus Schukar, Lukas Nagel, Stefan Hickmann, Volker TrappeAbstractDue to their high strength-to-weight ratio and excellent fatigue resistance, glass fiber reinforced polymers (GFRP) are used as a construction material in a variety of applications including composite high-pressure gas storage vessels. Thus, an early damage detection of the composite material is of great importance. Material degradation can be determined via measuring the distributed strain profile of the G...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Dielectric relaxation and AC conductivity behaviour of Se80Te15Bi5/PVA nanocomposite film
Publication date: Available online 27 August 2019Source: Polymer TestingAuthor(s): Rakhi Nangia, Neeraj K. Shukla, Ambika Sharma, DeepikaAbstractAn analytical approach has been applied to investigate the dielectric properties and ac conductivity behaviour of a new polymer nanocomposite (PNC) of polyvinyl alcohol (PVA) doped with nanocolloids of Se80Te15Bi5 glass over a frequency range of 100 Hz–5 MHz for temperatures ranging from 298 K to 448 K. An increase in dielectric constant and relaxation time for PNC has been seen as compared to pure PVA. The Cole-Cole model of relaxation shows good agreement with expe...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Morphology and mechanical properties of micro injection molded polyoxymethylene tensile rods
Publication date: Available online 28 August 2019Source: Polymer TestingAuthor(s): Matthieu Fischer, Pascal Pöhlmann, Ines KühnertAbstractMicro injection molding is a key process in the high-volume production of systems with small-scale parts, as it enables the production of consistent high-quality parts. Depending on the materials used, however, the properties of the parts may be strongly dependent on the processing conditions. Semi-crystalline materials, in particular, exhibit process-dependent structural evolution. To evaluate the impact of processing conditions on the morphology of polyoxymethylene (POM), thi...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Investigation on the bending and tensile performances of the T-shaped hook-connected structure made of laminated composites and TC4 alloy
Publication date: Available online 30 August 2019Source: Polymer TestingAuthor(s): Hongjian Zhang, Junhua Guo, Weidong Wen, Haitao CuiAbstractIn this work, a T-shaped hook-connected structure was designed, formed by hooking a T-shaped plate made of TC4 alloy and a bottom plate made of laminated composites. As a simulator of blade-casing connection structure, its bending and tensile properties are very important. Therefore, experiments on these two properties of this structure were performed, and the experimental loads were applied on the web of the T-shaped plate. Experimental results showed that the delamination damage ex...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Evaluation of the creep behaviour of the carbon fibre in an unidirectional pultruded reinforced composite using nano-indentation technique
Publication date: Available online 31 August 2019Source: Polymer TestingAuthor(s): Zhenxue Zhang, Santiago Corujeira Gallo, Xiaoying Li, Hanshan Dong, Dimitrios Dragatogiannis, Costas CharitidisAbstractThe interfacial strength (IFS) between carbon fibres and polymeric matrices has important implications for the mechanical properties of composite materials, which can be evaluated by a push-out method using an instrumented nano-indentation machine to assess the fibre's movement under increasing load and constant load (creep). In this paper, the nano-creep behaviour and time-dependent properties of carbon fibres in a reinforc...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

The structure-hydrolysis relationship of poly(3-hydroxybutyrate)
Publication date: Available online 1 September 2019Source: Polymer TestingAuthor(s): František Kučera, Josef Petruš, Josef JančářAbstractThe influence of the structure of different poly (3-hydroxybutyrate) (PHB) materials on the water diffusion and the extent of non-catalyzed/catalyzed hydrolytic degradation was investigated in the presence of>99% moisture. The change of the structure during the hydrolytic degradation was evidenced by Fourier transform infrared spectroscopy (FTIR). Melt volume rate measurement (MVR) and oscillatory rheological tests proved the enhanced rate of acid/alkali-catalyz...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Surface roughness of polyamide 12 parts manufactured using selective laser sintering
Publication date: Available online 1 September 2019Source: Polymer TestingAuthor(s): Sean Petzold, James Klett, Andrew Schauer, Tim OsswaldAbstractSelective laser sintering (SLS) is an additive manufacturing technique that has become increasingly prevalent in today's rapidly advancing production industries. SLS utilizes a layer-by-layer processing technique that allows for complex geometries to be produced without expensive tooling or molding. Because of the technology's widespread use in fulfilling functional demands, parts produced by SLS should have a good surface quality. However, parts manufactured via SLS have a comp...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Effects of Kevlar pulp on the enhancement of cryogenic mechanical properties of polyurethane foam
In this study, Kevlar pulp was added to PUF as a reinforcement material. Various experiments, specifically microstructural analysis (SEM and computed tomography), material performance tests (compressive strength and thermal conductivity), and spectroscopic analysis (XRD and FTIR), were conducted to confirm the effect of the Kevlar additive. Finding the optimum weight-percentage range is important to obtain a valid result because mechanical properties of experimental insulation are adjusted by controlling the quantity of the additive. The results of this study show that adding 0.8 wt% Kevlar pulp achieves the best improve...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Reinforcing effect of aramid fibers on fatigue behavior of SBR/aramid fiber composites
Publication date: December 2019Source: Polymer Testing, Volume 80Author(s): Lianpeng Yin, Zongtao Zhou, Zhu Luo, Jincheng Zhong, Peng Li, Bo Yang, Le YangAbstractThis paper investigates the correlation between fatigue performance and static tensile behavior of fiber reinforced rubber materials and presents change of fiber reinforced effect during fatigue process. A rough aramid fiber (AF) surface, which is helpful for combining AF and rubber matrix, was achieved by etching AF in NaOH/CH3CH2OH solution via the hydrolysis of amide bonds on the fiber. Then, the treated fiber was coated with an epoxy-functionalized silane (&ga...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

Experimental analysis of off-axis mechanical behaviors of PVC coated fabrics subjected to cyclic loading
Publication date: December 2019Source: Polymer Testing, Volume 80Author(s): Junhao Xu, Yingying Zhang, Meng Wu, Yushuai ZhaoAbstractThis paper investigates the off-axis mechanical behaviors of PVC coated fabrics under cyclic loading. Based on the cyclic loading tests with different off-axis angles, stress amplitude, and loading rate, the ratcheting behaviors and the strain decomposition in the cyclic loading test were studied. The results show that the mechanical behaviors of PVC coated fabrics are anisotropic viscoelastic, which is mainly associated with the stress state of internal yarns. After the first unloading, the m...
Source: Polymer Testing - September 4, 2019 Category: Chemistry Source Type: research

X-ray and terahertz imaging as non-destructive techniques for defects detection in nanocomposites foam-core sandwich panels containing carbon nanotubes
Publication date: October 2019Source: Polymer Testing, Volume 79Author(s): Iman Taraghi, Przemyslaw Lopato, Sandra Paszkiewicz, Elżbieta PiesowiczAbstractIn this article, we have studied the effects of carbon nanotubes on the state-of-the art non-destructive (NDT) techniques (X-ray radiography and terahertz imaging methods) for the inspection of defects in the polymeric foam-core sandwich panels. The aforementioned non-destructive techniques have been applied to visualize different types of defects such as holes, notches, inclusion (Teflon) that have been embedded in the polymeric foam core of sandwich panels. The results...
Source: Polymer Testing - August 31, 2019 Category: Chemistry Source Type: research

Enhanced water uptake of PHBV scaffolds with functionalized cellulose nanocrystals
Publication date: October 2019Source: Polymer Testing, Volume 79Author(s): Thaís Larissa do Amaral Montanheiro, Larissa Stieven Montagna, Viorica Patrulea, Olivier Jordan, Gerrit Borchard, Renata Guimarães Ribas, Tiago Moreira Bastos Campos, Gilmar Patrocínio Thim, Ana Paula LemesAbstractSuper hydrophilic scaffolds of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with 3 wt % of acetylated (CNC-Ac) and PEGylated (CNC-PEG) cellulose nanocrystals (CNC) were prepared. PHBV, PHBV/CNC-Ac, and PHBV/CNC-PEG scaffolds were characterized with respect to their morphology by scanning electron microscopy (S...
Source: Polymer Testing - August 31, 2019 Category: Chemistry Source Type: research

An experimental study on intraply fiber hybridization of filament wound composite pipes subjected to quasi-static compression loading
Publication date: October 2019Source: Polymer Testing, Volume 79Author(s): Özkan Özbek, Ömer Yavuz Bozkurt, Ahmet ErkliğAbstractThis paper aimed to explore the failure modes and crashworthiness characteristics of intraply hybridized fiber reinforced pipes (FRP) made of basalt and glass fiber reinforcements subjected to quasi-static compression loading. Experimental investigations were performed on various fiber orientation angles (±40°, ±55°, and ±70°) of the basalt FRP, glass FRP and hybridized basalt/glass FRP, fabricated by filament winding technique. Fracture mechanisms ...
Source: Polymer Testing - August 31, 2019 Category: Chemistry Source Type: research

Experimental investigation of a circumferential crack in a PMMA cylindrical shell using caustics
Publication date: October 2019Source: Polymer Testing, Volume 79Author(s): Wei Liu, Zhongwen Yue, Guoliang YangAbstractIn this paper, the optical method of transmitted caustics is extended to study the stress singularity at the tip of a circumferential crack in a PMMA cylindrical shell. First, a new theoretical analysis of light path is presented based on local deformations around the circumferential crack tip and geometry condition of the cylindrical shell. Second, governing equations of transmitted caustics are established, and the effects of material properties, radius of curvature, shell thickness and crack length on t...
Source: Polymer Testing - August 31, 2019 Category: Chemistry Source Type: research

A unique Microfiltration membrane derived from the poly(ethylene-co-methyl acrylate)/Poly(vinylidene fluoride) (EMA/PVDF) biphasic blends and surface modification for antifouling application
Publication date: October 2019Source: Polymer Testing, Volume 79Author(s): Sanjay Remanan, Narayan Chandra DasAbstractA new polymeric blend system is developed from the EMA and PVDF by melt-mixing at various blend compositions. Different techniques characterize the prepared blends, and especially, optical microscopy, XRD, and SAXS analyses study the blend crystallization. A microporous structure is prepared by selective solubilization of PVDF from the EMA/PVDF blends can be used as a membrane filter. The membrane prepared at various blend compositions from 90/10 to 60/40 ratio and tested in the cross-flow filtration cell. ...
Source: Polymer Testing - August 29, 2019 Category: Chemistry Source Type: research

Creep deformation simulation of adhesively bonded joints at different temperature levels using a modified power-law model
Publication date: Available online 26 August 2019Source: Polymer TestingAuthor(s): M.A. Saeimi Sadigh, B. Paygozar, L.F.M. da Silva, F. Vakili TahamiAbstractAdhesively bonded joints are widely used in engineering domains due to their capability to withstand different thermal and mechanical loads. In this paper, creep deformations of double lap adhesive joints under mechanical and thermal loads are investigated experimentally and numerically. For this aim, specimens of bulk adhesive are utilized in order to investigate the creep behavior and constitutive parameters of the material. The Power-law model is improved and used t...
Source: Polymer Testing - August 28, 2019 Category: Chemistry Source Type: research

A concise model to comprehension the transfer and output characteristics of polymeric field-effect transistors
Publication date: Available online 26 August 2019Source: Polymer TestingAuthor(s): Liu ChangshiAbstractTo obtain more quantitative electrical information of polymeric field-effect transistors, PFETs, this paper discuss a very important topic of the polymeric FETs modeling, and proposes a drain current-drain voltage, ISD-VSD, modeling approach only with two parameters for the PFETs. To validate the availability of the concise model proposed in the paper, experimental ISD-VSD curves data of four different PFETs are tested, simulation results show that the proposed models are accurate, effective and simple models for PFETs. A...
Source: Polymer Testing - August 26, 2019 Category: Chemistry Source Type: research

Effect of coating with novel bio nanocomposites of cationic starch/cellulose nanocrystals on the fundamental properties of the packaging paper
Publication date: Available online 26 August 2019Source: Polymer TestingAuthor(s): Khashayar Vaezi, Ghasem Asadpour, Hassan SharifiAbstractIn this research, an environmentally friendly and biodegradable cationic starch (CS)/nanocrystalline cellulose (NCC) nanocomposite coating was produced and it was applied to improve the mechanical, barrier and physical properties of packaging kraft paper via surface coating. The mechanical and barrier properties of the paper were affected by the CS/NCC nanocomposite coating and it was the subject of investigation. CS/NCC nanocomposites were prepared by the solvent method. Structural and...
Source: Polymer Testing - August 26, 2019 Category: Chemistry Source Type: research

Synergistic enhanced yield strength, tensile ductility and impact toughness of polydicyclopentadiene nanocomposites by introducing low loadings of di-functionalized silica
In this study, the reinforced tensile and impact properties of polydicyclopentadiene (PDCPD) composites are acquired via addition of ethyl,vinyl-functionalized silica (E,V–SiO2) with reasonably small particle size of 500 nm and uniform size distribution. It is interestingly noted that the tensile ductility of E,V–SiO2/PDCPD composites is dramatically improved by 862% through incorporation of 0.2 wt% E,V–SiO2. More significantly, the maximum tensile strength and impact toughness are enhanced by 22% and 99% via addition of E,V–SiO2. Excellent dispersion of E,V–SiO2 in the matrix, efficacious...
Source: Polymer Testing - August 23, 2019 Category: Chemistry Source Type: research

Editorial Board
Publication date: September 2019Source: Polymer Testing, Volume 78Author(s): (Source: Polymer Testing)
Source: Polymer Testing - August 23, 2019 Category: Chemistry Source Type: research

Blast responses of pultruded GFRP fluted-core sandwich panels: Testing and analyzing
Publication date: Available online 21 August 2019Source: Polymer TestingAuthor(s): Bei Zhang, Huguang He, Qiang Zhou, Hualin FanAbstractPultruded glass fiber reinforced polymer (GFRP) fluted-core sandwich panel is easily made and may be a lightweight construction for protective structures. Blast resistance of the GFRP fluted-core sandwich panels are investigated by explosion testing. In current research, when the scaled distance is larger than 1.494 m/kg1/3, the panel exhibits excellent anti-blast ability without any damage. Decreasing the scaled distance to 1.357 m/kg1/3, fluted-core shear damage is observed. Decreasi...
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Evaluation of invitro degradation of commercially available breast implants
This study investigated the mechanical and physicochemical properties of breast implants from five manufactures. Surface morphology, chemical composition, thermal behavior, cross-linking degree and mechanical properties were monitored on samples as received and after submitted to degradation in acidic and basic conditions. All samples demonstrated changes in chemical structure after degradation experiments, and parameters such as cross-linking degree and chemical composition seems to play important role on material performance. (Source: Polymer Testing)
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Influence of different types of antioxidants on the aging behavior of carbon-black filled NR and SBR vulcanizates
Publication date: Available online 20 August 2019Source: Polymer TestingAuthor(s): Katja Osswald, Katrin Reincke, Marcus Schossig, Selin Sökmen, Beate LangerAbstractBackgroundof this work were results of former investigations of carbon-black filled SBR and NR materials [1]. These results showed clear differences in the degradation behaviour of the used antioxidant during an artificial weathering of the vulcanizates based on SBR and NR. Further, changing material properties were observed with increasing aging time, but this could not be attributed to a decomposition process of the polymer network. For this reason, thre...
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Effect of silica particle size on the microstructure and physical properties of microporous poly(L-lactic acid) produced by uniaxial stretching
Publication date: Available online 20 August 2019Source: Polymer TestingAuthor(s): Yunjing Chen, Lijing Han, Lisong DongAbstractThe microporous poly(l-lactic acid) (PLLA) materials were prepared by uniaxial stretching PLLA/20 wt% silica (SiO2) composites. The SiO2 fillers with particle size of 15 nm, 200 nm, 500 nm, 1 μm, 2 μm, and 5 μm were selected to investigate the effect of particle size of fillers on the microstructures and physical properties of the microporous PLLA materials. Micropores were formed due to the debonding at the interface between PLLA and SiO2. The composites with SiO2 particle ...
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Design and characterisation of bicomponent polyamide 6 fibres with specific locations of each flame retardant component for enhanced flame retardancy
Publication date: Available online 21 August 2019Source: Polymer TestingAuthor(s): A. Richard Horrocks, Ahilan Sitpalan, Baljinder K. KandolaAbstractBicomponent filaments of polyamide 6 (PA6) were produced with core/sheath geometries containing aluminium diethyl phosphinate (AlPi), and/or a montmorillonite nanoclay located individually or together in the sheath or core. A characterisation protocol based on thermogravimetric analysis (TGA) under both flowing air and nitrogen and pyrolysis combustion flow calorimetry (PCFC) enabled the effects of AlPi, clay and atmospheric oxygen to be assessed on PA6 thermal degradation. Kn...
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Off-line TLC-IR (UATR) characterization of additives in EPDM rubber
Publication date: Available online 21 August 2019Source: Polymer TestingAuthor(s): Lidia Mattos Silva Murakami, Milton Faria Diniz, Leandro Mattos Silva, Natalia Beck Sanches, Rita de Cássia Lazzarini DutraAbstractSulfur donor accelerators and vulcanization agents, such as peroxides, due to their chemical characteristics and good thermal stability properties in rubber formulations, are essential to provide solutions in different sectors, such as aerospace and automotive, since they reduce the polymer degradation process (reversal), which can influence the performance of the elastomeric material. In this way, the use...
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Super-tough poly(lactic acid) thermoplastic vulcanizates with heat triggered shape memory behaviors based on modified natural Eucommia ulmoides gum
Publication date: Available online 21 August 2019Source: Polymer TestingAuthor(s): Yan Wang, Jinhui Liu, Lin Xia, Mei Shen, Zhenxiang XinAbstractTo take full advantage of renewability and environmental friendliness of poly(lactic acid) (PLA) and natural Eucommia ulmoides gum (EUG), PLA was used with epoxidized natural Eucommia ulmoides gum (EEUG) to prepare novel bio-based TPVs via a dynamic vulcanization method. The PLA/EEUG TPVs exhibited not only super toughness but also excellent shape memory behaviors, which might provide a new approach for the industrialization of super-toughened and bio-based shape memory TPVs. It w...
Source: Polymer Testing - August 22, 2019 Category: Chemistry Source Type: research

Optimizing creep lifetime of friction stir welded PMMA pipes subjected to combined loadings using rheological model
Publication date: Available online 19 August 2019Source: Polymer TestingAuthor(s): Farid Vakili-Tahami, Mohammad Reza Adibeig, Soran HassanifardAbstractThe most important feature of the polymeric pipes is that they creep even at room temperature. Therefore, investigating the creep behavior of the polymers and their welded joints is a major concern in the mechanical engineering. The aim of this research is to estimate the creep lifetime of the friction stir welded Polymethyl Methacrylate (PMMA) pipes which operate under combined loading. To develop the creep constitutive equations for both weld zone and parent material, cre...
Source: Polymer Testing - August 20, 2019 Category: Chemistry Source Type: research

Adapted measuring sequence for the determination of directional-dependent dynamic material properties using a bending resonance method
Publication date: Available online 19 August 2019Source: Polymer TestingAuthor(s): Martin Dannemann, Klaudiusz Holeczek, Jana Leimert, Stefan Friebe, Niels ModlerAbstractWithin this work, an adapted bending resonance method is presented, which is especially suitable to determine the elastic and damping material properties of composite materials. Since the properties of these material group depend among others on frequency and reinforcement direction, a large number of individual tests are required for a sufficient characterisation. Therefore, a new approach for an automatic data acquisition and analysis is developed and pr...
Source: Polymer Testing - August 20, 2019 Category: Chemistry Source Type: research

A method to predict the dynamical behaviors of carbon black filled natural rubber at different temperatures
Publication date: Available online 20 August 2019Source: Polymer TestingAuthor(s): Xiaoling Hu, Ruizhi He, Youjian Huang, Boyuan Yin, Wenbo LuoAbstractIn the tire industry, the Payne effect and hysteresis loss of carbon black (CB) filled rubber under cyclic loading are two kinds of most concerned issues. In this paper, effects of temperature ranging from −30 °C to 50 °C on the Payne effect and hysteresis loss of the CB filled natural rubber are investigated. Experimental results show that the amplitudes of the Payne effect are improved with the decreasing of temperature, especially, at −30 °C,...
Source: Polymer Testing - August 20, 2019 Category: Chemistry Source Type: research

Possibility of artocarpus heterophyllus latex as an alternative source for natural rubber
Publication date: Available online 20 August 2019Source: Polymer TestingAuthor(s): Sambhu Bhadra, Nitin Mohan, Gaurang Parikh, Sujith NairAbstractNatural rubber (NR) has much application in rubber product manufacturing industries, which cannot be replaced by synthetic rubber. At present, Hevea rubber tree is the only economical and commercially viable source of NR. Therefore, the objective of the present research was to find alternative source of NR. NR mainly comprise of cis-1,4 polyisoprene. Artocarpus heterophyllus latex (jackfruit latex) was collected and analyzed to investigate if it can be considered as alternative s...
Source: Polymer Testing - August 20, 2019 Category: Chemistry Source Type: research

Alginate membrane dressing toughened by chitosan floccule to load antibacterial drugs for wound healing
Publication date: Available online 17 August 2019Source: Polymer TestingAuthor(s): Lian Xing, Ye Ma, Huaping Tan, Guoliang Yuan, Shengke Li, Jianliang Li, Yang Jia, Tianle Zhou, Xiaohong Niu, Xiaohong HuAbstractTransparent and flexible alginate-based membranes containing antibacterial drugs were prepared by a casting/solvent evaporation method from alginate solution mixed with chitosan floccule (CSF) and oxidized sodium alginate (OAlg). To improve the properties of the membranes, CSF and OAlg were added to the alginate solution in different ratios. The mechanism of membrane formation is attributed to two aspects: Schiff-ba...
Source: Polymer Testing - August 19, 2019 Category: Chemistry Source Type: research