Add time:08/04/2019         Source:sciencedirect.com

The thermal decomposition of DIOCTYLTIN (cas 15231-44-4) maleate (DOTM) and a blend of PVC and DOTM has been studied in air, nitrogen and under vacuum. TG was used to examine the effect of different amounts of DOTM on stability. The PVC/DOTM mixture shows delayed dehydrochlorination in both the air and inert environment compared with PVC. The blend shows more thermal stability in an inert atmosphere than in air. The decomposition products from a blend containing a high loading of DOTM were investigated using Thermal Volatilisation Analysis (TVA) and Subambient Thermal Volatilisation Analysis (SATVA). Gas, liquid and tar fractions were separated and analysed by IR spectroscopy, on-line mass spectrometry or GC-MS. High molecular weight polycyclic aromatic hydro-carbons (PAH) found in the pyrolysis of pure PVC were not found from the blend. The pyrolysis in the presence of air rather than inert atmosphere does not change the nature of the products, although the relative amounts may be different. Traces of oxygen-containing volatile products are formed from the blend, while most of the oxygen-containing groups formed in the polymer pass into the tar as large fragments split from the crosslinked network. Dioctytin dichloride is the most important product apart from HCl from the pyrolysis of the PVCDOTM mixture.

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