Add time:09/09/2019         Source:sciencedirect.com

Investigations were made on the effects of alkyl(aryl)tin salts of maleic and thioglycolic acids and their esters upon the rate of dehydrochlorination and crosslinking, and on the absorption spectrum of PVC during degradation in vacuum at 190°. It was shown that these stabilizers cause dehydrochlorination of PVC to be eight times less than the rate of polymer degradation in vacuo with removal of HC1. The stabilizers are arranged according to their stabilizing powers. The interaction of the stabilizers with 2-chlorobutane (a model for normal units of PVC) was studied at 180°. According to the rate of this interaction, the compounds are arranged in inverse order compared with that for the stabilizing efficiency. Thermal degradations of the stabilizers themselves were investigated. Experimental data concerning the thermal degradation of PVC in the presence of organo-tin salts were considered from the point of view of simultaneous reactions of the stabilizers with HC1, chloroallylic fragments and normal units of the macromolecules.

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