A fluorine-containing polyimide(FPI) was synthesized by reacting 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with 2,2'-bis-(trifluoromethyl)-4,4'-diaminobiphenyl (TFDB). A series of polyimide composite films with various contents of nanosilica were prepared by an in situ polymerization technique. The obtained composite materials were analyzed with FTIR and the results showed that the amino groups were completely imidized. The morphology of the composites was characterized with SEM and the results indicated that the nanosilica particles integral dispersed but micro-aggregated in...
