摘要
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。
PVDF-based dielectric composite films were prepared by tape casting method from graphite micro sheet and PVDF. The graphite micro sheet was modified by surface chemical etching after thermal expansion, and the graphite micro sheet/PVDF composite films were prepared by adding the modified graphite micro sheet to PVDF matrix. Their microstructure, crystallization properties, thermodynamic stabil- ity, and dielectric property were tested, and the effect of graphite micro sheet on their properties was ana- lyzed. The results show that the graphite sheet is micron-sized, and it can well disperse in the PVDF matrix. The addition of graphite micro sheet has little effect on the phase change of the PVDF films and increases their thermal stability. The broadband dielectric spectroscopy test results show that when the doping amount of graphite micro sheet is no more than 3%, the highest dielectric constant of the composite films is 36 at 100 Hz. When the doping amount is up to 5%, the dielectric constant of the composite film sharply increases to 6.5×10^5.
出处
《绝缘材料》
CAS
北大核心
2016年第8期21-25,共5页
Insulating Materials
基金
国家自然科学基金项目(51177030)
黑龙江省自然科学基金项目(E201224)
关键词
石墨微片
PVDF
流延法
电性能
graphite micro sheet
PVDF
tape casting method
dielectric property
