Abstract
The results of comparative thermo-gravimetric analysis of the thermal degradation of polyarylalkylsilsesquioxanes (PAAS) in a vacuum show that the process in question takes place at an appreciable rate above 400° and consists of several parallel reactions: depolymerization, leading to the formation of low molecular cyclosilsesquioxanes, degradation of organic groups surrounding the polysilsesquioxane skeleton, and the formation of crosslinks in the polymer. The share of depolymerization in the overall degradation depends on the number of groups other than phenyl groups in the polymer, and on their type. When the number of alkyl groups is increased, the relative significance of the depolymerization reaction is enhanced. The thermal degradation of PAAS is influenced by the amount of reactive ionic centres present in the polymer, by the degree of supermolecular order and also, apparently, by the existence of various defects in the polymer chain.
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