SiO2/聚酰胺酰亚胺纳米复合材料的介电与热性能  

Dielectric and Thermal Properties of SiO2/Polyamide-imide Nanocomposites

作　　者：杨书宇 范勇[1] 陈昊[1] 杨瑞宵[1] 郭佳 YANG Shu-yu;FAN Yong;CHEN Hao;YANG Rui-xiao;GUO Jia(School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院

出　　处：《哈尔滨理工大学学报》2019年第3期123-129,共7页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51277044)

摘　　要：采用微乳化-相转变法制备纳米SiO2分散液,与聚酰胺酰亚胺树脂机械共混并流延成膜,制成不同纳米含量的复合材料。采用透射电子显微镜(TEM)和傅里叶变换红外光谱(FTIR)对材料进行表征,按照IEC60343的标准测试了材料的耐电晕寿命和其它介电性能,并进行了热重分析。结果表明,纳米粒子在PAI基体中分散均匀且反应完全;加入纳米粒子提高了材料的热稳定性;随纳米粒子含量的增加,电导率、介电常数和介质损耗均发生有规律的变化,PAI复合材料的耐电晕寿命随SiO2含量的增加而增加,纳米粒子含量达到20%时,耐电晕寿命为17.35 h,是纯PAI材料的8倍以上;击穿强度随纳米粒子含量的增加而减小。The nano-SiO 2 dispersions were prepared by microemulsification-phase transformation method and mechanically blended with polyamide-imide resin,and then cast into films with different nano-contents.Nanocomposite films were characterized by transmission electron microscopy(TEM)and Fourier transform infrared spectroscopy(FT-IR).The corona resistance life and other dielectric properties of the material were tested in accordance with the IEC60343 standard and thermogravimetric analysis was carried out.The results show that nano SiO 2 particles are uniformly dispersed in PAI matrix and materials reacted completely.The thermal stability of the composites are enhanced by adding nano particles.With the increase of SiO 2 content,the electrical conductivity,dielectric constant and dielectric loss changes regularly.Compared with pure PAI,the corona resistance life of nanocomposite with 20%SiO 2 is 17.35 h,which increases more than eight times.However,the breakdown strength of nanocomposites is a little lower with increase of nano-SiO 2 loading.

关 键 词：聚酰胺酰亚胺 纳米SIO2 介电性能 热性能 

分 类 号：TM215[一般工业技术—材料科学与工程]