Thermal Degradation Kinetics Of Para-substituted Poly (styrene Peroxide)s In Solution

Content Provider	Indian Institute of Science (IISc)
Author	De, Priyadarsi Chattopadhyay, Sujay Madras, Giridhar Sathyanarayana, D. N.
Copyright Year	2002
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 95ÀC). 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).
File Format	PDF
Journal	PeerReviewed
Language	English
Publisher	Wiley Periodicals Inc A Wiley Company
Publisher Date	2002-01-01
Access Restriction	Authorized
Subject Keyword	Inorganic & Physical Chemistry Chemical Engineering
Content Type	Text
Resource Type	Article