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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Study on filler content dependence of the onset of positive temperature coefficient (PTC) effect of electrical resistivity for UHMWPE/LDPE/CF composites based on their DC and AC electrical behaviors
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Study on filler content dependence of the onset of positive temperature coefficient (PTC) effect of electrical resistivity for UHMWPE/LDPE/CF composites based on their DC and AC electrical behaviors

机译：基于直流和交流电行为的UHMWPE / LDPE / CF复合材料的电阻率正温度系数（PTC）效应开始时填料含量的相关性研究

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摘要

Composites of carbon fibers (CF) filled with ultrahigh molecule weight polyethylene/low density polyethylene blend matrix (UHMWPE/LDPE) were prepared by kneading method. The positive temperature coefficient (PTC) effect of electrical resistivity of UHMWPE/LDPE/CF composites was investigated by direct current (DC) and alternating current (AC) measurements over the frequency range of 10~0-10~(6.5) Hz from 30 to 150 ℃. The onsets of PTC effect were found to be strongly depended upon the CF content even the melting behaviors were almost same for all composites. To interpret this phenomenon, a master curve of temperatureefrequencyeresistivity superposition was constructed for composites with different CF contents based on the AC resistivity. The CF content dependence of correlation length was related to the onset of PTC effect. The transitions of conductore-insulator were studied quantitatively by complex planes of AC impedance, and the calculated capacitances and resistances showed a similar PTC effect under DC. Based on the analysis of AC capacitance, the average distances between CFs were calculated using a plane capacitance model which varied with CF concentration and temperature, and the tendency was consistent to the PTC effect.
机译：通过捏合法制备了填充有超高分子量聚乙烯/低密度聚乙烯共混物基质（UHMWPE / LDPE）的碳纤维（CF）复合材料。通过在10〜0-10〜（6.5）Hz的频率范围（30）上通过直流（DC）和交流（AC）测量来研究UHMWPE / LDPE / CF复合材料的电阻率的正温度系数（PTC）效应至150℃。发现PTC效应的起效很大程度上取决于CF含量，即使所有复合材料的熔融行为几乎相同。为了解释这种现象，基于交流电阻率，针对具有不同CF含量的复合材料构建了温度-频率-电阻率叠加主曲线。相关长度的CF含量依赖性与PTC效应的发生有关。通过复杂的交流阻抗平面对导体-绝缘体的过渡进行了定量研究，计算得出的电容和电阻在直流下显示出相似的PTC效应。在对交流电容进行分析的基础上，利用平面电容模型计算出CF之间的平均距离，该电容随CF浓度和温度的变化而变化，其趋势与PTC效应一致。

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