使用低温可膨胀石墨，通过“原位膨胀-机械剥离”的方法制备了 PMMA/EG 复合材料，研究了可膨胀石墨含量对其电导率的影响。电导率、SEM、动态流变等测试表明膨胀后的石墨片层在树脂基体中分散良好；从10~20 phr 开始，石墨鳞片相互接触形成网络结构显著地提高电导率，最高达12个数量级。采用原位膨胀法可以制备逾渗阈值较小的导电复合材料，填充少量低温可膨胀石墨就可以大幅度提高 PMMA电导率。
PMMA/EG composite was prepared through the method of “in-situ expansion-mechanical exfoliation”and the influence of low-temperature expandable graphite (LTEG)content on its electrical property was investi-gated in this paper.Electrical conductivity,SEM and dynamic rheology analysis indicated that the layers of ex-panded graphite were well dispersed in resin matrix;when the composite containing 10-20 phr EG,graphite flakes were contacted mutually and formed the conductive network gradually,which increased electrical conduc-tivity obviously (up to a maximum of 10 1 2 ).The method of filling PMMA with LTEG can obtain low threshold value of seepage composite and improve electrical conductivity sufficiently at a low content of LTEG.
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