| Abstract
| - In this paper, we report that the interfacial interaction in polyimide (PI)/silica hybridcomposites can be characterized by a fluorescence spectroscopy. We found that silica showsdifferent effects on the fluorescence behavior of polyimide based on biphenyltetracarboximide(BPDA) depending on the type of diamine, that is, whether it is oxydiphenyldiamine (ODA)or phenylenediamine (PDA). The polyimide/silica hybrid composite films were prepared bythermal imidization and sol−gel method from tetraethoxy silane (TEOS). For the polyamicacid (PAA)/TEOS solutions, the interfacial interaction was discussed in terms of theintermolecular hydrogen bonding between PAA and Si(OH)4 or complexation between asolvent, N-methylpyrrolidinone (NMP), and PAA. Significant changes in the fluorescencewavelength as well as intensity were observed by the presence of silica particles in the caseof BPDA−PDA/silica composite films as compared to the case of BPDA−ODA/silica compositefilms. We found that silica has some interaction with BPDA−PDA but no interaction withBPDA−ODA in PI films. The interfacial interaction between silica and BPDA−PDA orBPDA−ODA was explained by different electron-donating strength of the diamines, here,PDA and ODA.
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