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以异丙醇铝为原料,用水热工艺合成了勃姆铝石溶胶,并通过原位生成法将勃姆铝石溶胶与聚酰亚胺复合,制备了勃姆铝石/聚酰亚胺纳米复合薄膜。利用X射线衍射、扫描电镜、热重分析及耐电晕性能测试分别对勃姆铝石溶胶和勃姆铝石/聚酰亚胺纳米复合薄膜进行了表征。结果表明:勃姆铝石晶体的粒度为20～30nm,勃姆铝石在聚酰亚胺基体中以纳米尺度分散,无团聚现象。纳米勃姆铝石的加入提高了复合薄膜的热稳定性及耐电晕时间。当勃姆铝石含量为9%时,复合薄膜的耐电晕时间是纯聚酰亚胺薄膜的13倍。
Using isopropylaluminum as raw material, the boehmite sol was synthesized by a hydrothermal process and the boehmite sol and the polyimide were compounded by the in-situ method to prepare the boehmite / polyimide nanometer Composite film. The properties of boehmite sol and boehmite / polyimide nanocomposite films were characterized by X-ray diffraction, scanning electron microscopy, thermal gravimetric analysis and corona resistance test. The results show that the particle size of the boehmite crystal is 20 ~ 30nm, and the boehmite is dispersed in the polyimide matrix on a nanometer scale with no agglomeration. The nano-boehmite added to improve the composite film thermal stability and corona resistance time. When the boehmite content is 9%, the corona-resistant time of the composite film is 13 times that of the pure polyimide film.