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Thermal degradation of polystyrene and polyethylene. Part III

Thermal degradation of polystyrene and polyethylene. Part III An apparatus has been constructed which enables one to follow continuously the formation of monomer during degradation in vacuum. Experimental results are presented on the degradation of fractionated and unfractionated polystyrene over a range of temperatures from 340–400°C. in vacuum. A mechanism has been proposed which accounts satisfactorily for the apparent zero‐order reaction and for the dependence of the rate of degradation on chain length. This mechanism allows one to estimate relative number average molecular weights and the number of weak points per original chain. The influence of a platinum surface on degradation has been indicated. The degradation of poly‐alpha‐methylstyrene has been investigated over a range of temperatures from 281 to 363°C. in vacuum. The mechanism of the degradation of branched polymer chains has been discussed. The degradation of cross‐linked polystyrene containing various amount of m‐divinylbenzene has been studied at 364°C. in vacuum. The reaction shows long induction periods depending on the amount of m‐divinylbenzene and on the presence of benzoyl peroxide during polymerization. The degradation of polyethylene shows this polymer to be more heat resistant than polystyrene. Various grades of different average molecular weight have been investigated over a range of temperatures from 375 to 436°C. in vacuum. The energy of activation has been found dependent on chain length. A mechanism has been suggested to account for the observed experimental results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Polymer Science Part A Polymer Chemistry Wiley

Thermal degradation of polystyrene and polyethylene. Part III

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Publisher
Wiley
Copyright
Copyright © 1949 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0887-624X
eISSN
1099-0518
DOI
10.1002/pol.1949.120040102
Publisher site
See Article on Publisher Site

Abstract

An apparatus has been constructed which enables one to follow continuously the formation of monomer during degradation in vacuum. Experimental results are presented on the degradation of fractionated and unfractionated polystyrene over a range of temperatures from 340–400°C. in vacuum. A mechanism has been proposed which accounts satisfactorily for the apparent zero‐order reaction and for the dependence of the rate of degradation on chain length. This mechanism allows one to estimate relative number average molecular weights and the number of weak points per original chain. The influence of a platinum surface on degradation has been indicated. The degradation of poly‐alpha‐methylstyrene has been investigated over a range of temperatures from 281 to 363°C. in vacuum. The mechanism of the degradation of branched polymer chains has been discussed. The degradation of cross‐linked polystyrene containing various amount of m‐divinylbenzene has been studied at 364°C. in vacuum. The reaction shows long induction periods depending on the amount of m‐divinylbenzene and on the presence of benzoyl peroxide during polymerization. The degradation of polyethylene shows this polymer to be more heat resistant than polystyrene. Various grades of different average molecular weight have been investigated over a range of temperatures from 375 to 436°C. in vacuum. The energy of activation has been found dependent on chain length. A mechanism has been suggested to account for the observed experimental results.

Journal

Journal of Polymer Science Part A Polymer Chemistry – Wiley

Published: Feb 1, 1949

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