iPP/HDPE/CB三元导电复合材料的导电与流变行为

利用界面能原理使CB选择性分布于HDPE中成为复合导电相,固定CB在HDPE中的质量分数(20 wt％),控制CB/HDPE导电相在iPP中的含量,制备出一系列三元(iPP/HDPE/CB)导电复合材料,并研究其导电逾渗和流变逾渗行为.结果表明,在复合导电相含量为20 wt％时复合材料内即形成导电网络,在复合导电相含量30 wt％时出现流变网络.只有当复合导电相在材料中形成连续相时(60 wt％),损耗因子在频率扫描中才出现峰值.

CONDUCTIVE AND RHEOLOGICAL BEHAVIORS OF iPP/HDPE/CB TERNARY COMPOSITES

The electrical and rheological percolations in the iPP/HDPE/CB ternary composites are reported.The CB particles are selectively located in the HDPE phase.The HDPE/CB phase is conductive with 20 wt% CB.When the contents of HDPE/CB phase in the matrix of iPP increases,the conductive and rheological networks of the iPP/HDPE/CB ternary composites can be found.The results show that the electrical percolation appears when the HDPE/CB content reaches 20 wt%,and the percolation content of the HDPE/CB phase in the iPP matrix is 30 wt% obtained by dynamic rheology.The loss tangent does not show a peak in the frequency sweep until the HDPE/CB phase becomes a continuous phase in the material.This finding indicates that the role of loss tangent peak is not able to give enough information about the formation of the filler network in the ternary system.This may be due to the fact that the relaxation of the phase covers the relaxation of the filler network.We proposed a way to determine the existence of the filler network in the ternary composites.First,determine whether the filler particles form a network in the filler-rich phase by a frequency sweep on this component.Second,use the power-law relationship to determine whether the filler-rich phase forms a network in the ternary composites.