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Abstract
119mSn Mössbauer studies of the thermal degradation of PVC containing the stabilisers dibutyltinbis (isooctylthioglycollate) (1.2% by weight of the polymer), dioctyltinbis (isooctylthioglycollate (4% by weight of the polymer) and dibutyltinbis (isooctylmaleate) (2% by weight of the polymer) indicate that in each case the stabiliser is converted into the dialkylmonochlorotin ester R2SnCl(X) (X SCH2CO2C8H17 or O2C.CH CHCO2C8H17), and not into the dialkyltin dichloride, R2SnCl2, as recently suggested by other workers. Comparison of the Mössbauer data for organotin-stabilised PVC samples prepared by both hot-milling and room temperature solvent casting processes indicates that there is little degradation of the polymer (and stabiliser) during the initial hot-milling process.
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