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Thermal conductivity and mechanical properties of high density polyethylene composites filled with silicon carbide whiskers modified by cross-linked poly (vinyl alcohol)

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Journal of Materials Science & Technology 2018年第12期34卷 2407-2414页

作者： Jiaming Fan Shiai Xu School of Materials Science and Engineering East China University of Science and TechnologyShanghai 200237China School of Chemical Engineering Qinghai UniversityXining 810016China

A thin layer of poly(vinyl alcohol)(PVA) was coated on the surface of silicon carbide whiskers(SCWs)and crosslinked by glutaraldehyde, and then these modified whiskers(mSCWs) were incorporated into high density polyethylene(HDPE) to prepare HDPE/mSCW composites with a high thermal *** thermal conductivity, mechanical properties, heat resistance, thermal stability and morphology of HDPE/mSCW and HDPE/SCW composites were characterized and compared. The results reveal that the thermal conductivity of both HDPE/SCW and HDPE/mSCW composites increases with the increase of filler loading, and reaches a maximum of 1.48 and 1.69 W/(m K) at 40 wt% filler loading, which is 251.20% and 300.75% higher than that of HDPE, respectively. Significantly, HDPE/mSCW composites have a higher thermal conductivity than their HDPE/SCW counterparts with the same filler loading. In addition, the heat resistance, Young’s modulus and yield strength of both HDPE/SCW and HDPE/mSCW composites are also improved compared with that of HDPE. mSCW can be homogenously dispersed in the HDPE matrix, which contributes to the formation of thermally conductive networks by the inter-connection of mSCWs.

关键词： polyethylene composites Silicon carbide Whisker Thermal conductivity

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Effect of Carbon Fillers in Ultrahigh Molecular Weight polyethylene Matrix Prepared by Twin-Screw Extrusion

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Materials Sciences and Applications 2016年第12期7卷 863-880页

作者： Luiz Felipe M. Rocha Suellem B. Cordeiro Leonardo C. Ferreira Flávio James H. Ramos Maria de Fátima Marques Instituto de Macromoleculas Professora Eloisa Mano Universidade Federal do Rio de Janeiro RJ Cidade Universitaria Centro de Tecnologia Rio de Janeiro Brazil Instituto Militar de Engenharia (IME) Se&ccedil ã o de Engenharia Mecâ nica e Materiais Pra&ccedil a General Tibú rcio Rio de Janeiro Brazil

Oxidized (GO) and expanded (G-Exp) graphite were employed to prepare composites with ultrahigh molecular weight polyethylene (UHMWPE) matrix using masterbatches of polyethylene with different compositions. The materials and a blend of UHMWPE/HDPE were prepared by extrusion and their properties were evaluated. The effect of carbon fillers on the crystalline structure, thermo dynamic-mechanical (DMTA) and thermal properties (melting and crystallization temperatures) of the composites were discussed. The thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) measurements showed that the addition of masterbatch with GO and G-Exp significantly increased the crystallite size of composites, increasing the temperatures of melting, degradation, glass transition and the degree of crystallinity of polyethylene. DMTA analysis indicated the storage and loss moduli of composites in relation to neat UHMWPE, the blend and UHMWPE/composites. SEM micrographs showed a flatter, continuous and uniform surface meaning a compact lamellar structure. The present work resulted in interesting findings on the effects of GO on the crystalline structures, mechanical and thermal properties of UHMWPE, which can lead to generalizations useful for future work.

关键词： Polyolefin Blend Oxidized Graphite Expanded Graphite polyethylene composites

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聚乙烯复合材料老化的物理与化学

聚乙烯复合材料老化的物理与化学

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2010年全国高分子材料科学与工程研讨会

作者：杨睿刘颖于建清华大学化工系高分子研究所

＜正＞将无机填料填充到聚合物中,可以提高强度、耐热性、尺寸稳定性和阻隔性能等,同时大大降低成本。因此,聚合物基复合材料研究一直备受关注。与此同时,无机填料对聚合物的稳定性也会产生较大影响,研究聚合物复合材料的老化稳定性对... 详细信息

＜正＞将无机填料填充到聚合物中,可以提高强度、耐热性、尺寸稳定性和阻隔性能等,同时大大降低成本。因此,聚合物基复合材料研究一直备受关注。与此同时,无机填料对聚合物的稳定性也会产生较大影响,研究聚合物复合材料的老化稳定性对于材料的研制和应用无疑具有重要意义。

关键词： polyethylene composites Aging Tensile property Crystallization

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