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中文摘要：
选用可膨化石墨（EGP）和低密度聚乙烯（LDPE）制备了一种导电复合材料，并系统研究了LDPE／EGP复合材料的电学、力学性能以及正温度系数（PTC）效应。实验结果表明，随着EGP用量的增加，复合材料的拉伸强度升高，弹性形变减少，为保证复合材料的力学性能，EGP的最大填充量应低于40％。加入一定比例的EGP后，纯LDPE电阻率降低了近6个数量级。随着EGP含量的增加，复合材料的PTC强度先增加后降低。当EGP含量介于30％～35％之间时，复合材料的PTC强度达到最大值，最大值约为5．85。选择合适的热处理温度和密炼时间，可获得具有较高PTC强度的复合材料。
英文摘要：
LDPE/EGP electrical conducting composites were prepared using low density polyethylene （LDPE） and expanded graphite （EGP）. The effects of EGP on the electrical and mechanical properties and PTC of the prepared composites were investigated. Results showed that the tensile strength of the composites decreased with the increasing content of EGP, and the EGP content should be lower than 40%. The PTC strength of the composites increases firstly and then decreases along with the increasing EGP content and achieved the maximum value of about 5.85 at 33% of filling content. Moreover, it was found that the PTC strength of the composites was affected by the heat treatment and blending time.
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