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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。
EGP and LDPE were used to prepare a kind of conductive composites. The electrical and mechanical properties and the positive temperature coefficient (PTC) effects of LDPE / EGP composites were systematically investigated. The experimental results show that with the increase of the amount of EGP, the tensile strength and the elastic deformation of the composites increase. In order to ensure the mechanical properties of the composites, the maximum loading of EGP should be less than 40%. After adding a certain proportion of EGP, pure LDPE resistivity decreased by nearly 6 orders of magnitude. With the increase of EGP content, the PTC strength of the composite first increases and then decreases. When the EGP content is between 30% ~ 35%, the PTC reaches its maximum strength and the maximum value is about 5.85. Select the appropriate heat treatment temperature and mixing time, can be obtained with higher PTC strength of the composite material.