Abstract
The stabilisation of poly(vinyl chloride) (PVC) by dibutyltin dilaurate (DBTDL) has been studied. Results show that the products of oxidative degradation of PVC are negligible in the presence of DBTDL, which corresponds to a secondary antioxidant effect. There is no correlation between polymer stability and residual tin-content. The influence of DBTDL on the change in molecular weight of PVC has been determined by GPC. The molecular weight of unstabilised PVC decreases slowly early in the degradation, and then increases, which is in contrast to stabilised PVC in which the molecular weight remains unchanged early in the degradation. The molecular weight distribution increases later. On the basis of the experiments, it is suggested that the mechanism of stabilisation is a free radical process. It is proposed that the allyllic chlorine atoms in PVC are substituted by the carboxylate groups of DBTDL in a radical process. A kinetic equation for the stabilisation of PVC has been deduced.
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