以均苯四甲酸二酐(PMDA)，4,4′-二氨基二苯醚(ODA)为单体，分别采用N,N-二甲基乙酰胺(DMAc)、DMAc/二甲苯为溶剂，制备了两种PI/SiO2纳米杂化薄膜，并对其微观结构、热稳定性、光学透明性、力学性能进行研究。结果表明：与采用DMAc为溶剂相比，当采用DMAc/二甲苯为溶剂时，SiO2粒子的粒径较小；PI/SiO2纳米杂化薄膜的热稳定性、透光性、强度及韧性均得到提高。
Using pyromellitic dianhydride(PMDA) and 4,4′-diaminodiphenyl ether(ODA) as monomer, N, N-dimethylacetamide(DMAc) and DMAc/dimethyl benzene as solvent respectively, two kinds of polyimide/silica(PI/SiO2) nano-hybrid films were prepared, and their micro structure, thermal stability, transparency and mechanical properties were studied. The results indicate that compared with DMAc as solvent, when using DMAc/dimethyl benzene as solvent, the size of silica particle is smaller, and the thermal stability, transparency, tensile strength and toughness of the PI/SiO2 hybrid film is improved.
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