聚酰亚胺/二氧化钛纳米复合薄膜制备与耐电晕性  

Preparation and Corona Resistant of Polyimide/TiO_2 Nanocomposite Films

作　　者：孔宇楠 殷景华[1,2] 铁雯鹭 刘晓旭[1] 宋明歆[1] 雷清泉[2] 

机构地区：[1]哈尔滨理工大学应用科学学院,哈尔滨150080 [2]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080

出　　处：《无机材料学报》2014年第1期98-102,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(51077028);黑龙江省自然科学基金(A201006);黑龙江省青年科学基金(QC2011C106)~~

摘　　要：采用原位聚合法制备不同TiO2组分聚酰亚胺(PI)/纳米TiO2复合薄膜,薄膜厚度50μm。测试结果表明,TiO2呈球状颗粒,直径约为100 nm,聚酰亚胺呈片状,尺寸约为2μm×1μm。随着TiO2含量的增加,复合薄膜介电常数和介电损耗增大,击穿场强先增加后降低;在40 kV/mm电场强度下,复合薄膜耐电晕老化寿命增加,纯PI薄膜寿命为3 h,20wt%TiO2含量薄膜寿命达到25 h;TiO2颗粒耐电晕能力强,与聚合物形成界面相,改变材料陷阱能级,有利于空间电荷的扩散和热量的传输,在薄膜表面形成放电阻挡层,降低局部放电对薄膜内部的侵蚀,显著提高薄膜耐电晕老化寿命。The polyimide （PI）/TiO2 composite films with different component were prepared by in-situ dispersion polymerization. Thickness of the obtained films is about 50 μm. The characterization results show that diameter of spherical TiO2 in the films is about 100 nm and the size of the lamellar polyimide is about 2 μm ×1 μm. With the increase of the TiO2 content, electrical breakdown strength increases firstly and then decreases, while the values of permittivity, dielectric loss, corona resistant lifetime increase. Under the electric field of 40 kV/mm, corona resistant lifetime of pure PI is about 3 h, while the lifetime of composite film with 20wt% TiO2 is about 25 h. TiO2 has a high performance in corona resistance forming interphase with polymer and changing the trapping levels of material, facilitating diffusion of space charge and transmission of heat in material. A large of TiO2 particles can form discharge blocking layer on the surface of films and reduce internal erosion by partial discharge. Therefore, the corona resistant ability of nanocomposite films is significantly improved.

关 键 词：聚酰亚胺 TIO2 复合薄膜 制备 耐电晕 

分 类 号：TM215[一般工业技术—材料科学与工程] TQ323[电气工程—电工理论与新技术]