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

Kinetic Study of Effect of Irganox E Antioxidants on Thermal Degradation of Poly (Vinyl Chloride)

E. Klein, P. Kovařík, and L. Valko

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

E-mail: klein@chtf.stuba

Abstract: The effect of three Irganox E-type antioxidants (E 17, E 120, and E 201), based on alpha -tocopherol, on poly(vinyl chloride) thermal degradation rate at 180°C has been studied. Fifteen film samples, which consisted of suspension poly(vinyl chloride), lubricant, and antioxidant, were prepared. Four samples contained a Ca/Zn stabilizer system with an epoxy co-stabilizer and Irganox E 201. Degradation in real atmosphere was followed by continuous potentiometry. The time of thermal stability tau and gradient of degradation dn_HCl/dt values were evaluated from the measured kinetic curves. Values of tau in the case of samples containing Ca/Zn stabilizer system did not overlap 90 min, their colour stability is approximately 25-30 min. Calculations of the kinetic parameters have shown that the studied antioxidants from the Irganox E group do not cause the polyene sequences growth termination.

Full paper in Portable Document Format: 552a67.pdf

Chemical Papers 55 (2) 67–70 (2001)