A 119mSn Mössbauer study of the photochemical degradation of organotin stabilised PVC |
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| Authors: | John S Brooks Richard W Clarkson David W Allen Malcolm TJ Mellor Alfred G Williamson |
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| Institution: | 1. Department of Physics. Sheffield City Polytechnic, Pond Street, Sheffield S1 1WB, Great Britain;2. Department of Chemistry. Sheffield City Polytechnic, Pond Street, Sheffield S1 1WB, Great Britain |
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| Abstract: | Although organotin compounds are widely used as thermal and photochemical stabilisers for PVC, their mode of action and their fate on degradation of the polymer are not yet fully understood. 119mSn Mössbauer spectroscopy has been used to study chemical changes undergone by two commonly used stabilisers, dibutyltinbis(iso-octylthioglycollate) and dibutyltinbis(iso-octylmaleate), during irradiation of stabilised PVC in artificial sunlight. After 1000 hours' exposure, the maleate stabiliser is chemically unchanged, whereas the thioglycollate is rapidly converted to the monochloroester, Bu2SnCl(SCH2CO2C8H17). Prolonged exposure of the thioglycollate stabilised polymer leads to the formation of stannic oxychloride. |
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