Journal of Polymer Science Polymer Chemistry Edition · 1981 · 25 citations · 14 references
Natural SciencesChemical EngineeringChemistryPolymer ChemistryPolymer MaterialsThermal AnalysisPolymer AnalysisPolymer CharacterizationPolymer DegradationPolymer StabilityPolymer ThermodynamicsThermogravimetric AnalysisGas Chromatography-mass SpectrometryPolymer Degradation AnalysisPolymer Degradation KineticsPolymer PyrolysisPolymer Thermal DegradationPyrolysisThermal Degradation ProductsThermal Degradation Studies
Abstract For the purpose of studying the mechanism of thermal degradation of poly[(tetramethyl‐p‐silphenylene) Siloxane] (poly TMPS) a series of polymers with silphenylene and siloxane bonds in the main chain were prepared and subjected to thermogravimetry (TG) and pyrolysis study. Analyses of products from poly TMPS degradation (in vacuum at a constant temperature) by gas chromatography (GC), infrared (IR), nuclear magnetic resonance (NMR) spectroscopy, and gas chromatography‐mass spectrometry (GC–MS) revealed that degradation occurs at the silphenylene bonds. The TG curves obtained in He for heating rates of 1,2,2.5,7.5, and 10°C/min were analyzed by the Ozawa method; activation energies of 39 ± 1 and 45 ± 2 kcal/mol were obtained respectively for the initial cleavage of the methyl side group and the later‐stage scission of the main‐chain silphenylene bond which leads to a major weight loss. The results agree with those obtained for other structurally similar polymers.
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