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

Kinetic Study of Action of Additives in Poly(Vinyl Chloride) Stabilizer Systems. 1. Sterically Hindered Phenolic Antioxidants

P. Kovařík, E. Klein, and L. Valko

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

Abstract: The action of two antioxidants from the sterically hindered phenol group - Irganox 1010 and Topanol CA - has been studied. Twenty-five film samples, which consisted of poly(vinyl chloride), antioxidant, and heat stabilizer systems, have been prepared. The additives used were nontoxic and without ecological hazards. Degradation in real atmosphere was followed potentiometrically. The time of thermal stability tau and the gradient of degradation degree dx/dt were evaluated from the measured kinetic curves. Kinetic models were proposed for the antioxidant as sole additive and for the antioxidant-CaO system to calculate the corresponding rate constants, which allow to compare the effectiveness of the antioxidant and to prove the synergism between CaO and Irganox 1010. Two composite stabilizer systems for long-time stabilization have been found.

Full paper in Portable Document Format: 515a245.pdf

Chemical Papers 51 (5) 245–251 (1997)