Interfacial interaction in polyimide/silica hybrid composites by fluorescence spectroscopy

Citation
Cs. Ha et al., Interfacial interaction in polyimide/silica hybrid composites by fluorescence spectroscopy, CHEM MATER, 12(3), 2000, pp. 839-844
Citations number
41
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
08974756 → ACNP
Volume
12
Issue
3
Year of publication
2000
Pages
839 - 844
Database
ISI
SICI code
0897-4756(200003)12:3<839:IIIPHC>2.0.ZU;2-4
Abstract
In this paper, we report that the interfacial interaction in polyimide (PI) /silica hybrid composites can be characterized by a fluorescence spectrosco py. We found that silica shows different effects on the fluorescence behavi or of polyimide based on biphenyltetracarboximide (BPDA) depending on the t ype of diamine, that is, whether it is oxydiphenyldiamine (ODA) or phenylen ediamine (PDA). The polyimide/silica hybrid composite films were prepared b y thermal imidization and sol-gel method from tetraethoxy silane (TEOS). Fo r the polyamic acid (PAA)/TEOS solutions, the interfacial interaction was d iscussed in terms of the intermolecular hydrogen bonding between PAA and Si (OH)(4) or complexation between a solvent, N-methylpyrrolidinone (NMP), and PAA. Significant changes in the fluorescence wavelength as well as intensi ty were observed by the presence of silica particles in the. case of BPDA-P DA/silica composite films as compared to the case of BPDA-ODA/silica compos ite films. We found that silica has some interaction with BPDA-PDA but no i nteraction with BPDA-ODA in PI films. The interfacial interaction between s ilica and BPDA-PDA or BPDA-ODA was explained by different electron-donating strength of the diamines, here, PDA and ODA.