期刊
POLYMER DEGRADATION AND STABILITY
卷 91, 期 11, 页码 2731-2738出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2006.04.031
关键词
TriSilanolIsobutyl-POSS; methylsilicone resin; thermal stability; thermogravimetric analysis (TGA)
Methylsilicone resin/polyhedral oligomeric silsesquioxane (POSS) composites with various proportions of POSS monomer were synthesized by the reaction of functionalized TriSilanolIsobutyl-POSS macromonomer with hydroxyl-terminated methylsilicone resin. The structures of the obtained hybrid polymers were characterized with Fourier-transformed infrared (FIF-IR) and transmission electron microscopy (TEM). The FT-IR spectra suggested successful bonding of TriSilanolIsobutyl-POSS and methylsilicone resin. TEM analysis showed that POSS can dissolve in methylsilicone resin at the molecular level. The influences of TriSilanolIsobutyl-POSS on the thermal stability and degradation behavior of methylsilicone resin were studied by thermogravimetric analysis (TGA), solid-state Si-29 NMR and X-ray photoelectron spectroscopy (XPS). All these techniques showed that TriSilanolIsobutyl-POSS incorporation results in increased decomposition temperatures and oxidation resistance, primarily by reducing the effect of silanol end groups on the thermolysis through condensation reaction of Si-OH groups and partial loss of isobutyl followed by the formation of an inorganic SiO2 layer to prevent methylsilicone from further degradation. (c) 2006 Elsevier Ltd. All rights reserved.
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