Thermal degradation kinetics of para-substituted poly (styrene peroxide)s in solution

De, Priyadarsi and Chattopadhyay, Sujay and Madras, Giridhar and Sathyanarayana, DN (2002) Thermal degradation kinetics of para-substituted poly (styrene peroxide)s in solution. In: Journal of Applied Polymer Science, 86 (4). pp. 957-961.

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Abstract

The thermal degradation of three polymeric peroxides of styrene monomers with substituents in the para position was studied at various temperatures (65, 75, 85, and 95°C). A continuous distribution model was used to evaluate the rate coefficients for the random-chain and chain-end scission degradation from the evolution of molecular weight distributions with time. The activation energy determined from the temperature dependence of the rate coefficients was in the range 18-22 kcal mol-1. This result suggests that the thermal degradation of polyperoxide is controlled by the dissociation of the O - O bonds in the polymer backbone. The thermal stability for poly(p-methylstyrene peroxide) lies in between that of poly(p-tert-butylstyrene peroxide) (highest) and poly(p-bromostyrene peroxide) (lowest).

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Wiley Periodicals, Inc., A Wiley Company
Keywords:	polyperoxide;thermal degradation;molecular weight distributions;activation energy
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	14 Jul 2004
Last Modified:	19 Sep 2010 04:13
URI:	http://eprints.iisc.ernet.in/id/eprint/1021

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