γ-Al_2O_3/聚酰亚胺纳米复合薄膜的制备与表征  

PREPARATION AND CHARACTERIZATION OFγ-Al_2O_3/POLYIMIDE NANOCOMPOSITE FILMS

作　　者：周宏[1] 范勇[1] 王晓琳[1] 李娟[1] 陈昊[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150040

出　　处：《硅酸盐学报》2009年第6期932-936,共5页Journal of The Chinese Ceramic Society

基　　金：黑龙江省科技攻关项目(GC04A216);黑龙江省自然科学基金(E2007-29);黑龙江省研究生创新基金(YJSCX2005-235HLJ)资助项目。

摘　　要：采用水热工艺,以异丙醇铝为原料,制备出虫孔状形貌的γ-Al_2O_3溶胶,采用原位生成法合成了网状结构的γ-Al_2O_3/聚酰亚胺(polyimide,PI)纳米复合薄膜。用透射电镜、X射线衍射仪及Fourier红外光谱仪表征了溶胶的形貌及结构。用扫描电镜表征了复合薄膜的形貌。用耐电晕测试装置测试了复合薄膜的耐电晕时间。结果表明:所制备的溶胶呈虫孔状分子筛形貌,其结构中含有氢键;当掺杂质量(下同)高于12%时,复合薄膜中的无机相明显形成连续的网状结构;随着掺量的增加,复合薄膜的耐电晕时间增加,掺杂质量为25%的复合薄膜耐电晕时间是纯PI薄膜的25.4倍。分析了溶胶的形貌、结构对复合薄膜形貌及耐电晕性能的影响。γ-A12O3 sol with a ＂wormhole-like＂ pore structure was prepared from aluminum alkoxide precursor by a hydrothermal process and γ-Al2O3/polyimide （PI） nanocomposite films with a network structure were synthesized by an in situ synthesis process. The sol was characterized by the transmission electron microscope, X-ray diffraction and Fourier transform infrared spectroscopy. The morphologies of the nanocomposite films were characterized by the scanning electron microscope, and the corona resistance time of the nanocomposite films was measured. The results show that the γ-Al2O3 sol is a porous molecular sieve with a ＂wormhole-like＂ pore structure and there are many hydrogen bonds in the chemical structure of γ-Al2O3 particles. A continuous network of inorganic phase is clearly observed in the nanocomposite fills when the γ-Al2O3 mass fraction （the same below） exceeds 12%. With increasing doping content, the corona resistance time of the composite films increases obviously. The corona resistance time of the film with 25% doping concentration is 25.4 times longer than that of the pure PI film. Based on the results, the effects of the morphology and chemical structure of the sol on the morphology and corona resistance time of the composite films were also analyzed.

关 键 词：γ-氧化铝/聚酰亚胺纳米复合薄膜 耐电晕时间 形貌结构 γ-氧化铝溶胶 水热工艺 

分 类 号：TB332[一般工业技术—材料科学与工程]