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Abstract
Thermal decomposition during pyrolysis of poly(vinyl alcohol) (PVA) was investigated using off-line pyrolysis gas chromatography mass spectrometry (Py-GCMS). Observation of a yellow-brown smoke produced when PVA was heated at elevated temperatures indicated that the liquid products may contain highly conjugated chromophores not previously reported. Collection of the resulting pyrolysis mixtures and subsequent analysis by GC-MS confirmed the presence of conjugated, high-molecular-weight compounds in the product mixture. Identification of individual components indicates that the mechanism of degradation involves dehydration followed by random chain scission and eyclization to produce conjugated molecules of moderate to high molecular weight.
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