Tc. Chang et al., Organic-inorganic hybrid materials. V-dynamics and degradation of poly(methyl methacrylate) silica hybrids, J POL SC PC, 38(11), 2000, pp. 1972-1980
Citations number
30
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Poly(methyl methacrylate)-silica hybrid materials (PMMA-SiO2) were prepared
by in situ polycondensation of alkoxysilane in the presence of trialkoxysi
lane-functional PMMA. Infrared, differential scanning calorimetry, Si-29 an
d C-13 nuclear magnetic resonance spectroscopy, and thermogravimetric analy
sis were used to study the PMMA-SiO2 hybrids. The effects of the content an
d kind of the alkoxysilane on the dynamics and stability of the PMMA-SiO2 h
ybrids were investigated in this study. The dynamics of SiO2 within hybrids
were investigated with Si-29-H-1 cross-polarization. The spin-diffusion pa
th length was on a nanometer scale estimated with the spin-lattice relaxati
on time in the rotating frame (T-1p(H)). The apparent activation energies f
or the degradation of the hybrids under air and nitrogen were evaluated by
the van Krevelen method. (C) 2000 John Wiley & Sons, Inc.