The results of pyrolytic gas chromatographic experiments performed with poly[ethylenebis(dimethylsiloxane)] and poly[propylenebis(dimethylsiloxane] samples have been utilized for the evaluation of the mechanism of the thermal degradation of these polymers. All the significant peaks on the pyrograms have been identified and the relative amounts of the pyrolysis products have been determined at different pyrolysis temperatures. According to the experimental results, two types of decomposition reactions occur during pyrolysis, (a) a siloxane-type degradation leading to the elimination of cyclic monomers from the polymer chain and (b a radical-type splitting of the CC or SiC bond in the hydrocarbon segment followed by an intramolecular radical transfer and subsequent β-scission. These two processes occur simultaneously.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry