Thermal degradation of poly[alkenebis(dimethylsiloxanes)] : I. By pyrolytic gas chromatography

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