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Organic–inorganic hybrid materials. V. Dynamics and degradation of poly(methyl methacrylate) silica hybrids

✍ Scribed by T. C. Chang; Y. T. Wang; Y. S. Hong; Y. S. Chiu

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
213 KB
Volume
38
Category
Article
ISSN
0887-624X

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✦ Synopsis

Poly(methyl methacrylate)-silica hybrid materials (PMMA-SiO 2 ) were prepared by in situ polycondensation of alkoxysilane in the presence of trialkoxysilanefunctional PMMA. Infrared, differential scanning calorimetry, 29 Si and 13 C nuclear magnetic resonance spectroscopy, and thermogravimetric analysis were used to study the PMMA-SiO 2 hybrids. The effects of the content and kind of the alkoxysilane on the dynamics and stability of the PMMA-SiO 2 hybrids were investigated in this study.The dynamics of SiO 2 within hybrids were investigated with 29 Si-1 H cross-polarization. The spin-diffusion path length was on a nanometer scale estimated with the spin-lattice relaxation time in the rotating frame (T 1 H ). The apparent activation energies for the degradation of the hybrids under air and nitrogen were evaluated by the van Krevelen method.

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