ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Influence of metal stearates on thermal stability of poly(vinyl chloride). 3. Zinc stearate

J. Oremusová, P. Šimon, L. Valko, and P. Kovařík

Department of Physical Chemistry, Faculty of Chemical Technology, Slovak Technical University, CS-812 37 Bratislava

Abstract: Influence of zinc stearate on the kinetics of thermal dehydrochlorination of poly(vinyl chloride) (PVC) is studied. The study is completed by viscosimetric determination of the relative molecular mass of the samples thermally stressed. A reaction mechanism of the PVC dehydrochlorination in the presence of zinc stearate is proposed and the rate constants of individual reaction steps are determined by comparing the experimental and theoretical kinetic curves. The results obtained show that zinc stearate is a very efficient scavenger of hydrogen chloride. Considering the accelerating effect of zinc compounds on PVC dehydrochlorination, it is found that only Zn-Cl bonds formed as the product of stabilizer decay exhibit this effect.

Full paper in Portable Document Format: 453a379.pdf

Chemical Papers 45 (3) 379–388 (1991)