Simultaneous sol-gel and anionic photopolymerization of 3-(glycidyloxypropyl)trimethoxysilane via photobase catalysis
Résumé
Type II polyether-silica hybrid films were successfully synthesized from 3-(glycidyloxypropyl)trimethoxysilane (GPTMS) through a novel photobase-catalyzed sol-gel and anionic polymerization using an alpha-amino acetophenone derivative as a tertiary amine photogenerator. We report here some characterization evidence establishing that the hybrid precursor undergoes two different polymerization reactions in a single step. FTIR analysis as well as solid-state NMR ((13)C, (29)Si) shed light onto the tandem formation of the silica network and the polyether chains. The prominent role played by alpha-amino acetophenone in the dual catalysis was also highlighted by comparison with other O-acyloxime-based photobase generators.