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A study of the mechanism of the oxidative thermal degradation of poly(ethylene oxide) and poly(propylene oxide) using 1H- and 13C-NMR

✍ Scribed by Li Yang; Frank Heatley; Trevor G. Blease; Robert I.G. Thompson

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 946 KB
Volume: 32
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(95)00182-4

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✦ Synopsis

The oxidative thermal degradation of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) at 150°C in air was studied. The weight loss was determined, and the structure of the residual polymer investigated using NMR. In PEO, the only significant structural changes were the formation of formate ester and hydroxy end-groups, the former predominating. In PPO, significant amounts of primary hydroxy end-groups of the structure -OCH(CH,)CH,OH and secondary hydroxy end-groups of the structure -CH,CH(CH,)OH were formed, together with their formate and acetate esters. These structural changes have been interpreted in terms of the decomposition of a peroxy species initially formed by substitution of a backbone hydrogen by a peroxy group.

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