Journal
POLYMER DEGRADATION AND STABILITY
Volume 98, Issue 1, Pages 109-114Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2012.10.021
Keywords
Poly(dimethylsiloxane); Octavinyl POSS; Thermal stability; Mechanism; Crosslink
Categories
Funding
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
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The effects of octavinyl polyhedral oligomeric silsesquioxane (Vi-POSS), silica (SiO2), and octaphenyl POSS (Ph-POSS) on the thermal stability of poly(dimethylsiloxane) (PDMS) were studied using thermal gravimetric analysis. The decomposition mechanism of the PDMS/Vi-POSS composite was proposed by crosslinking density measurement, decomposition residues and volatiles analysis. The results showed that the Vi-POSS had significant effect on enhancing the thermal stability of PDMS. The decomposition mechanism of PDMS was changed by the chemical incorporation of Vi-POSS, but SiO2 and Ph-FOSS had few effects on the polymer decomposition process, because they were mixed by simple physical blending. The cyclic depolymerization of PDMS, which produced many cyclic oligomers at relatively low temperature, was suppressed by the heavily crosslinked network in the PDMS/Vi-POSS composite. The scissions of carbon-carbon, silicon-carbon and carbon-hydrogen bonds took place at higher temperature, releasing hydrogen, methane, ethylene and ethane, left behind siliconoxycarbide and some free carbon at 800 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
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