Abstract
The effect of silica and siloxane on thermo-oxidative degradation of a series of hydrogen-bonded acidic fluorinated poly(amide-imide-silica) hybrids was investigated by TGA, IR and OIT tests. Silica was proved to enhance the first stage thermo-oxidative decomposition of the hybrids without siloxane segments from the values of the first stage weight loss and activation energy. However, the effect of siloxane was more dominant than that of silica when a flexible siloxane segment was incorporated, proved by lower glass transition temperatures from DSC examination. Silica and siloxane effect were also confirmed by the difference of IR intensity ratios of the degraded hybrids. Moreover, the results of oxidative induction time (OIT) test were consistent with the sequence of the first stage activation energy.
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