选用石墨微片为填充材料,以PVDF为基体,采用流延法制备PVDF基介电复合薄膜.将热膨胀后的石墨微片进行表面化学改性得到改性石墨微片.将改性石墨微片添加到PVDF基体中,制备了石墨微片/PVDF复合薄膜,对复合薄膜的微观结构、结晶性能、热力学稳定性以及介电性能进行测试,分析了石墨微片对复合薄膜性能的影响.结果表明:石墨微片直径为微米级且能较好的分散在PVDF基体中,石墨微片的引入对PVDF薄膜的相变影响不大.热分析显示,石墨微片的加入提高了复合薄膜的热稳定性.宽频介电谱测试表明,在100 Hz测试频率下,当石墨微片含量≤3％时,复合薄膜的介电常数最高为36.当石墨微片含量提高至5％时,复合薄膜的介电常数突增至6.5×105.
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