纳米Mg(OH)_2-ZnO/聚酰亚胺复合薄膜的介电和热性能

Dielectric and thermal properties of nano Mg(OH)_2-ZnO/polyimide composite film

采用反向沉淀法制备了Mg(OH)_2-ZnO纳米粒子,通过原位聚合和热亚胺化的方法成功制备了不同纳米Mg(OH)_2-ZnO粒子质量分数的纳米Mg(OH)_2-ZnO/聚酰亚胺(PI)复合薄膜,通过SEM、热重分析、介电谱测试仪和击穿场强测试仪对薄膜的表面形貌、热稳定性、介电性能和击穿强度进行表征和测试。结果表明:Mg(OH)_2-ZnO纳米粒子均匀地分散在PI基体中,Mg(OH)_2-ZnO/PI热稳定性下降,介电常数、介电损耗和电导率增加,击穿场强随纳米粒子增加先增加后减小,在纳米粒子含量为2%时,达到最大值296kV/mm。

Nano Mg（OH）2-Zn（OH）2 particles were prepared by reverse precipitation method,nano Mg（OH）2-ZnO/polyimide（PI）composite films with different mass contents of Mg（OH）2-ZnO were successfully prepared by in-situ polymerization and thermal imidization.The surface morphology,thermal stability,dielectric properties and breakdown strength of the films were characterized by SEM,TG,dielectric spectrum tester and breakdown strength tester.The results show that the Mg（OH）2-ZnO nanoparticles are homogeneously dispersed in the PI matrix,thermal stability decreases,dielectric constant,dielectric loss and electrical conductivity have been increased,the breakdown strength of nano Mg（OH）2-ZnO/PI composite films increases first and then decreases with the increasing of nanoparticles,and reaches a maximum value of 296 kV/mm at nanoparticle content of 2%.