溶胶-凝胶法制备可溶性聚酰亚胺/二氧化硅纳米复合材料的研究──Ⅰ.溶胶一凝胶转变过程和反应机理的研究  

Studies on Soluble Polyimide/Silica Nanocomposites via Sol-gel Process──I. Studies on Sol-gel Transition and Reaction Mechanisms

作　　者：杨勇[1] 朱子康[1] 漆宗能[2] 

机构地区：[1]上海交通大学化学化工学院,上海200240 [2]中国科学院化学所工程塑料国家重点实验室,北京100080

出　　处：《功能材料》1999年第1期78-81,共4页Journal of Functional Materials

摘　　要：选取可溶性聚酰亚胺（PI）作为有机高聚物基体．通过正硅酸四乙酯（TEOS）在聚酰胺酸（PAA的N-甲基-2-吡咯烷酮（NMP）溶液中进行溶胶-凝胶反应．制备出新型的聚酰亚胺／二氧化硅（PI／SiO2）纳米复合材料。并用UV－Vis、XPS、IR和SEM等方法对其溶胶-凝胶转变过程和水解-缩合反应机理进行了研究。结果表明，在水解-缩合反应过程中，TEOS与聚酰胺酸发生反应，生成较为稳定的中间产物；在高温亚胺化的同时完成溶胶-凝胶转变，原位（in－situ）生成SiO2凝胶网络，最终制得PI／SiO2纳米复合材料。A new class of soluble polyimide/silica hybrid films or solutions were poepared by the sol-gel reaction starting from tetraethoxyilane(TEOS) in the solution of polyamic acid in N- methyl-2-pyrrolidone. The hybrid films were obtained by the hydroysispolycondensation of TEOS in the polyamic acid solution, followed by heating st 270℃. UV-Vis, XPS, IR and SEM were employed tocharcterize the process and mechanism of sol-gel transition. The results obtained indente that the polycondensation of silica gel and imidization of polyamic acid are accomplished simultaneously. Before heated with high temperature, there exists a relative stableintermediate status, which mates the sol-gel route more flexible to prepare organic-inorganic nanocomposites.

关 键 词：聚酰亚胺 二氧化硅 纳米复合材料 溶胶-凝胶 

分 类 号：TB332[一般工业技术—材料科学与工程]