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Thermally induced double-positive temperature coefficients of electrical resistivity in combined conductive filler-doped polymer composites

机译:组合导电填料聚合物复合材料中电阻率的热诱导的双正温度系数

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摘要

Polymer composites of low-density polyethylene/polypropylene/graphite/vanadium dioxide (LDPE0.8/PP0.2/Gr(0.4)/VO2) are prepared by classical melt-mixing technology and show a notable double positive temperature coefficient of electric resistivity (PTC), which originates from the combined effect of highly conductive Gr and VO2 with a thermal phase transition. When the weight ratio of VO2 is 8 wt %, the positive temperature coefficient intensity (PTCI) for the composites reaches 3.85 orders of magnitude. The model system demonstrates the reason for the improvement in the PTC performance of the polymer composites by analyzing the construction of the conductive networks. Therefore, the addition of phase-transition compounds may be a promising path to improving PTC materials. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44876.
机译:通过经典熔融混合技术制备低密度聚乙烯/聚丙烯/石墨/石墨/石墨/钒/钒/钒的聚合物复合材料(LDPE0.8 / PP0.2 / GR(0.4)/ VO2),并显示出显着的双正温度系数电阻率( PTC),其源自高导电GR和VO2的综合效应具有热相转变。 当VO2的重量比为8wt%时,复合材料的正温度系数强度(PTCI)达到3.85幅度。 模型系统通过分析导电网络的结构,演示了聚合物复合材料的PTC性能的原因。 因此,添加相转移化合物可以是改善PTC材料的有望的途径。 (c)2017 Wiley期刊,Inc.J.Phill。 聚合物。 SCI。 2017,134,44876。

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