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Kinetic Study of Action of Additives in Poly(Vinyl Chloride) Stabilizer Systems - II. Sterically Hindered Phenolic Antioxidants: Influence of Degradation Atmosphere

P. Kovařík, E. Klein, and M. Schwarzová

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 - and a composite stabilizer system based on calcium/zinc compounds has been studied. Fifty film samples with various amounts and combinations of additives have been prepared. The additives used were nontoxic, suitable for food packaging materials. Degradation in the inert nitrogen atmosphere has been followed potentiometrically. The time-of thermal stability and the gradient of degradation degree dx/dt have been evaluated from the measured kinetic curves and a composite stabilizer system for long-time stabilization has been found. Calculations of the rate constants have shown ability of the antioxidants to terminate growth of polyene sequences and their weak ability to act as HCl trappers.

Full paper in Portable Document Format: 523a175.pdf

 

Chemical Papers 52 (3) 175–177 (1998)

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