The analysis of tin stabilisers used in poly(vinyl chloride) compositions

Abstract

Schemes are described for the analysis of commercial tin stabilisers commonly used in poly(vinyl chloride) compositions. Methods are given for the chemical breakdown of a sample and subsequent separation and identification of the breakdown products, which may include dialkyltin oxides, alcohols, thiols, carboxylic acids and thioacids. Separations are carried out by precipitation, solvent extraction and thin-layer chromatographic techniques, and the components identified by gas-chromatographic, infrared, nuclear magnetic resonance and mass-spectroscopic methods.

Manual and potentiometric titration procedures for quantitative examination together with recommended methods for the determination of tin are either described in this paper or in the literature cited, and methods for identification of additives and procedures for identification of tin stabilisers in the presence of excess of plasticiser, by means of column chromatography and ion-exchange procedures, are also included.