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Composites science and technology 29건

  1. [해외논문]   Editorial Board  


    Composites science and technology v.162 ,pp. ii - ii , 2018 , 0266-3538 ,

    초록

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  2. [해외논문]   High performance proton-conducting composite based on vanadium-substituted Dawson-type heteropoly acid for proton exchange membranes  

    Wu, Han (Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China ) , Wu, Xuefei (Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China ) , Wu, Qingyin (Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China ) , Yan, Wenfu (State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China)
    Composites science and technology v.162 ,pp. 1 - 6 , 2018 , 0266-3538 ,

    초록

    Abstract Proton exchange membranes (PEMs) are the key parts in proton exchange membrane fuel cells (PEMFCs). In this work, a proton-conducting composite membrane rGO-P 2 W 16 V 2 @SPEEK was synthesized from vanadium-substituted Dawson-type heteropoly acid (H 8 P 2 W 16 V 2 O 62 •20H 2 O, abbreviated as P 2 W 16 V 2 ), sulfonated polyether ether ketone (SPEEK) and reduced graphene oxide (rGO). Characterizations proved the integrity of the Dawson-structure heteropoly acids (HPAs) in composites and the uniform inorganic-organic hybrid distribution. The membrane shows excellent proton conductivity of 7.90 × 10 −2 S cm −1 at 50 °C and the proton conduction was proved to comply with the Grotthuss mechanism. Up to now, this is the first time that a Dawson-type HPA was reported for the application of PEMs and this work extended the application of polyoxometalate-based materials in the field of fuel cells.

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  3. [해외논문]   Synergetic enhancement of thermal conductivity by constructing hybrid conductive network in the segregated polymer composites  

    Wang, Zhi-Guo (College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China ) , Gong, Feng (School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China ) , Yu, Wan-Cheng (College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China ) , Huang, Yan-Fei (College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China ) , Zhu, Lei (Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106-7202, United States ) , Lei, Jun (College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China ) , Xu, Jia-Zhuang (College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China ) , Li, Zhong-Ming (College of Polymer Science and E)
    Composites science and technology v.162 ,pp. 7 - 13 , 2018 , 0266-3538 ,

    초록

    Abstract Effectively thermal conduction pathways are essential for the thermal conductivity of polymer-based composites. In this contribution, we proposed a facile and feasible strategy to improve the thermal conductivity of polymer composites through constructing a segregated structure and hybrid conductive network. Boron nitride (BN) and aluminium nitride (AlN) were mechanically wrapped upon ultrahigh-molecular-weight polyethylene (UHMWPE) granules and then high-pressure consolidated. Morphology observation revealed that in the typical segregated pathways, polyhedral AlNs were in tandem with adjacent BN plates. A significantly synergistic enhancement in the thermal conductivity was achieved by the hybrid conductive network. At the total filler content of 50 wt%, the BN/AlN/UHMWPE composite with a filler ratio of 6:1 showed the thermal conductivity of 7.1 Wm -1 K −1 , outperforming BN/UHMWPE and AlN/UHMWPE composites by 35.1% and 613%, respectively. Infrared thermal images further demonstrated that the composites with hybrid segregated structure had strongest capability to dissipate the heat against the counterparts with single segregated structure. Based on the percolation effect with an effective medium approach, the theoretical calculation suggested that AlN played a bridge role to interconnect the BN platelets in the segregated conductive pathways, leading to the formation of the more effective thermally conductive pathways. The obtained results offer valuable fundamentals to design and fabricate the highly thermal-conductive polymer composites as advanced thermal management materials.

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  4. [해외논문]   Synthesis of highly-stretchable graphene – poly(glycerol sebacate) elastomeric nanocomposites piezoresistive sensors for human motion detection applications  

    Yan, Yi (School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia ) , Potts, Michael (School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia ) , Jiang, Zhengyi (School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia ) , Sencadas, Vitor (School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia)
    Composites science and technology v.162 ,pp. 14 - 22 , 2018 , 0266-3538 ,

    초록

    Abstract Strain sensors capable of monitoring human motion are highly desirable not only to monitor in real time complex body parts movement but also to assess the patients' health condition. In this work, highly stretchable elastomeric nanocomposite strain sensors were developed by synthesis of poly(glycerol sebacate) (PGS) prepolymer, followed by incorporation of the graphene flakes (fG) during the curing procedure of the PGS elastomeric matrix. The PGS had Young's modulus ( E ) of 69 ± 6 kPa, while the sample with 10 wt% fG had a E of 501 ± 28 kPa, which is as soft as human skin. Moreover, the incorporation of the fG filler led to an increase of the matrix cross-linking density, from 8.0 ± 0.6 mol/m 3 , up to 35.5 ± 1.4 mol/m 3 , recorded for the pure matrix and for the sample with 10 wt% fG, respectively. The electromechanical behavior of the nanocomposite samples showed that the resistance changes linearly with the applied strain, until a maximum strain of 50%, and is independent of the stroke speed or applied strain. The nanocomposite sensor sensibility was calculated through the gauge Factor (GF), and a value of ∼2 was obtained for all the processed strain gauges. Furthermore, the developed sensors showed a remarkable capability to monitor the bending movement of the finger. Finally, the performance revealed by the synthetized piezoresistive sensors will contribute to the next generation of highly stretchable smart materials for sensing and control human motion with minimum discomfort.

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  5. [해외논문]   High-performing multi-walled carbon nanotubes/silica nanocomposites for elastomer application  

    Kong, Linghan (State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China ) , Li, Feng (State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China ) , Wang, Fanghui (State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China ) , Miao, Ye (State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China ) , Huang, Xidai (State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China ) , Zhu, Hong (State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China ) , Lu, Yonglai (State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P.R.)
    Composites science and technology v.162 ,pp. 23 - 32 , 2018 , 0266-3538 ,

    초록

    Abstract Elastomer composites with high comprehensive performance have been the focus of the studies in the rubber industry. Especially, the multicomponent nanocomposites as fillers in the rubber matrix have attracted global attention. In the present work, silica nanoparticles (SiO 2 ) were assembled with multi-walled carbon nanotubes (CNTs), and the resulting CNTs/SiO 2 nanocomposites were incorporated into solution-polymerized styrene butadiene rubber/butadiene rubber (SSBR/BR) to fabricate CNTs/SiO 2 -SSBR/BR elastomer composites. The morphologies and structures of CNTs/SiO 2 and CNTs/SiO 2 -SSBR/BR were characterized, and the performances of CNTs/SiO 2 -SSBR/BR composites were measured. The results showed that the SiO 2 with small particle size (10–15 nm) could be tightly anchored on the surface of CNTs through covalent bonds, and the resulting CNTs/SiO 2 nanocomposites were highly compounded with SSBR/BR in a uniformly dispersed status. With the increasing weight percentage of CNTs in CNTs/SiO 2 nanocomposites, both the tensile strength and elongation at break of CNTs/SiO 2 -SSBR/BR is increased to 23.6 MPa and 603.9%, respectively. These results clearly illustrate the high reinforcement effect of CNTs/SiO 2 nanocomposites to SSBR/BR. Meanwhile, compared with that of commercial Zeosil 1165MP highly-dispersed nano-SiO 2 (Zeosil 1165MP)-SSBR/BR, the tan δ of the 2% CNTs/SiO 2 -SSBR/BR (2 wt% CNTs in CNTs/SiO 2 ) is 17.1% higher at 0 °C and 17.3% lower at 60 °C, indicating the endowed high wet skid resistance and low rolling resistance of CNTs/SiO 2 -SSBR/BR. Also, the heat build-up and wear resistance exhibit significantly decline at the low weight percentages of CNTs. The enhanced comprehensive performances demonstrate the utilizability of CNTs/SiO 2 as a reinforcing filler for the application of high performance green tire.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Broadband radar absorption and mechanical behaviors of bendable over-expanded honeycomb panels  

    Wang, Peng (PLA Laboratory of Protective Materials and Structures, State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China ) , Zhang, Yichen (PLA Laboratory of Protective Materials and Structures, State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China ) , Chen, Hailong (PLA Laboratory of Protective Materials and Structures, State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China ) , Zhou, Yinzhi (PLA Laboratory of Protective Materials and Structures, State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China ) , Jin, Fengnian (PLA Laboratory of Protective Materials and Structures, State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China ) , Fan, Hualin (Research Center of L)
    Composites science and technology v.162 ,pp. 33 - 48 , 2018 , 0266-3538 ,

    초록

    Abstract When over-expanded, the hexagonal honeycomb (HH) turns to bendable quadrilateral honeycomb. The over-expanded honeycomb (OH) is anisotropic. In-plane crushing behaviors of the OH were revealed by experiments. Compressed along arm-chair direction, the OH has three deformation modes, turning from quadrilateral honeycomb, re-entrant hexagonal honeycomb to triangular honeycomb. The Poisson's ratio turns from zero, negative to positive. Compressed along the beeline direction, the OH is crushed at shear buckling band. The equivalent strength and modulus change with the compression direction and consistently predicted by structural models. Coated with carbon powder based absorbing material, the OH turns to a multifunctional material. The microwave absorbing behavior changes with the relative density and the thickness of the OH. Oblique incidence promotes the microwave absorption and it is suggested that the incident angle should not be larger than 45°. Pasting GFRC skin, the OH-core sandwich panel still has excellent radar absorption but it will be decreased when the skin is thickening. Through the research, radar absorbing OH has the capabilities of load bearing and electromagnetic energy absorbing. Furthermore, the OH is bendable along arm-chair direction and convenient to make cylindrical sandwich shell.

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  7. [해외논문]   Improving thermal, electrical and mechanical properties of fluoroelastomer/amino-functionalized multi-walled carbon nanotube composites by constructing dual crosslinking networks  

    Gao, Wei (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Guo, Jianhua (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Xiong, Junbin (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Smith, Andrew T. (Department of Chemical & Biomolecular Engineering and Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA ) , Sun, Luyi (Department of Chemical & Biomolecular Engineering and Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA)
    Composites science and technology v.162 ,pp. 49 - 57 , 2018 , 0266-3538 ,

    초록

    Abstract Carboxylic functionalized multi-walled carbon nanotubes (MWCNTs-COOH) were modified by using ethylenediamine (EDA) to prepare amino-functionalized multi-walled carbon nanotubes (MWCNTs-A). MWCNTs-A were characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Fluoroelastomer (FKM) was reinforced by incorporation of MWCNTs-COOH and MWCNTs-A, respectively. The thermal, electrical and mechanical properties of the FKM/MWCNT composites were studied. The results indicated that a more homogeneous dispersion of nanotubes and a stronger interfacial interaction in FKM/MWCNTs-A composites were achieved than in FKM/MWCNTs-COOH ones. As a result, the thermal, electrical and mechanical properties of the FKM/MWCNTs-A composites were higher than that of the FKM/MWCNTs-COOH composites due to the participation of MWCNTs-A in the crosslinking process to form dual crosslinking networks in the FKM matrix.

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  8. [해외논문]   Hybrid core-shell nanofibers as moisture sensors for human breath monitoring  

    Lv, Ruihua (Corresponding author.) , Li, Shuai , Jin, Tianxiang , Na, Bing , Zhou, Haiying , Liu, Hesheng
    Composites science and technology v.162 ,pp. 58 - 63 , 2018 , 0266-3538 ,

    초록

    Abstract This study reports moisture sensors for monitoring human breath process. The sensors are assembled from hybrid core-shell nanofibers with electrospun poly (acrylonitrile) nanofibers as the mechanical core and thin polyaniline shells as the moisture sensing material, respectively. The polyaniline shells are coated on the electrospun nanofibers via in situ polymerization. The sensors are sensitive to moisture breathed out from both mouth and nose; and their response is determined by the loading and morphology of polyaniline as well as the amount of moisture. In combination with high porosity and mechanical flexibility, the sensors can be readily integrated with textiles to fabricate wearable electronics.

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  9. [해외논문]   A review of flammability of natural fibre reinforced polymeric composites  

    Kim, N.K. (Corresponding author.) , Dutta, S. , Bhattacharyya, D.
    Composites science and technology v.162 ,pp. 64 - 78 , 2018 , 0266-3538 ,

    초록

    Abstract Susceptibility to damage from heat and flame is one of the major issues for utilisation of natural fibre reinforced polymeric composites in practical applications. Thus, the knowledge of thermal decomposition and flammability of the bio-based fibres, polymers and their composites is highly required for the materials selection and the development of composite products. Moreover, suitable flame retardant treatments on these composites have shown to effectively enhance their thermal stability and fire resistance. This article provides a review of research on thermal behaviour and flammability of natural fibres, such as cellulose and protein based fibres, and polymers along with composites filled with these materials. Furthermore, eco-friendly flame retardant treatments to overcome the environmental impact of conventional flame retardants are introduced with the combined effects of natural fibres on composites' fire performance. In addition, a review of studies on the predictive models regarding thermal response and structural damages of composites in fire is also included with their advantages and limitations.

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  10. [해외논문]   Extension of Puck's inter fibre fracture (IFF) criteria for UD composites  

    Gu, Jiefei (Corresponding author.) , Chen, Puhui
    Composites science and technology v.162 ,pp. 79 - 85 , 2018 , 0266-3538 ,

    초록

    Abstract Puck's action plane failure criteria have already proven their capability in the first and second world-wide failure exercises (WWFE-I and WWFE-II). However, Puck and his co-workers have only recommended inclination parameters for GFRP/Epoxy and CFRP/Epoxy. These UD composites generally have high transverse compressive-to-tensile strength ratios Y C / Y T , and are regarded by them as intrinsically brittle materials. Therefore, Puck's inter fibre fracture (IFF) criteria might not be directly applied to other types of UD composites with low Y C / Y T ratios. In particular, Puck's original IFF criteria will result in unrealistic predictions if Y C /Y T is extremely low. In the present study, Puck's original IFF criteria are extended to all types of UD composite materials to solve the problem. Composites are divided into three categories, namely semi-brittle materials, brittle materials, and intrinsically brittle materials. Depending on the material category, three different algorithms are proposed for determination of the two parameters in Puck's IFF criteria, namely the resistance of the action plane against transverse tensile stressing, R ⊥ A t , as well as the inclination parameter of contour lines of the fracture body, p ⊥ ⊥ . The present criteria are theoretically evaluated for composites with low Y C /Y T ratios, while the predictions of the present criteria are compared with the test results of composites with high Y C /Y T ratios such as thermoset GFRP and CFRP. Theoretical and experimental assessment demonstrates the reasonableness of the extension of Puck's IFF criteria.

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    Fig. 1 이미지

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