Effects of TriSilanolIsobutyl-POSS on thermal stability of methylsilicone resin |
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Authors: | Y.R. Liu L. Liu |
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Affiliation: | Polymer Materials and Engineering Division, Department of Applied Chemistry, P.O. Box 410, Faculty of Science, Harbin Institute of Technology, Harbin 150001, PR China |
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Abstract: | 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 (FT-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 29Si 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. |
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Keywords: | TriSilanolIsobutyl-POSS Methylsilicone resin Thermal stability Thermogravimetric analysis (TGA) |
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