Thermal stability and kinetics of decomposition of polyphenylsilsesquioxanes and some related polymers

The thermal stability and the mechanism and kinetics of decomposition of the ladderlike polymer polyphenylsilsesquioxane (PPS) and some related polyorganosiloxanes were studied by means of thermal analysis, pyrolysis GC, GC-MS, and other methods. The experimental results show that ladderlike PPS is...

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Bibliographic Details
Published in:Polymer degradation and stability 1988, Vol.20 (2), p.157-172
Main Authors: Zhang, X, Shi, L, Li, S, Lin, Y
Format: Article
Language:English
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Summary:The thermal stability and the mechanism and kinetics of decomposition of the ladderlike polymer polyphenylsilsesquioxane (PPS) and some related polyorganosiloxanes were studied by means of thermal analysis, pyrolysis GC, GC-MS, and other methods. The experimental results show that ladderlike PPS is thermally more stable than the analogous single chain polymer PDPS. Above 505°C, PPS decomposes by mechanisms of phenyl group elimination and carbonization. The apparent activation energy of the decomposition of PPS is about 270 kJ/mol, which is much higher than those of other polyorganosiloxanes studied. Copolymers of PPS with PDPS and PDMS have intermediate thermal properties. MW and MWD have a negligible effect on the stability of PPS while chlorination lowers the heat-resistant properties significantly.
ISSN:0141-3910
1873-2321
DOI:10.1016/0141-3910(88)90084-5