Organic-inorganic hybrid materials. I. Characterization and degradation ofpoly(imide-silica) hybrids

Poly(imide-silica) hybrid materials with covalent bonds were prepared by (3 -aminopropyl)methyldiethoxysilane (APrMDEOS) terminated amic acid, water, a nd tetramethoxysilane (TMOS) via a sol-gel technique. Infrared (IR), Si-29 and C-13 CP/ MAS nuclear magnetic resonance (NMR) spectroscopy, and thermog ravimetric analysis (TGA) were used to study hybrids containing various pro portions of TMOS and hydrolysis ratios. The microstructure and chain mobili ty of hybrids were investigated by proton spin-spin relaxation T-2 measurem ents. The apparent activation energy E-a for degradation of hybrids in air was studied by the van Krevelen method. (C) 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 2275-2284, 1999.