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The vacuum and oxidative pyrolysis of poly-p-xylylene

✍ Scribed by Jellinek, H. H. G. ;Lipovac, S. N.

Publisher
Wiley (John Wiley & Sons)
Year
1970
Tongue
English
Weight
696 KB
Volume
8
Category
Article
ISSN
0449-296X

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✦ Synopsis

Abstract

Poly‐p‐xylylene prepared by pyrolysis of di‐p‐xylylene has been degraded under vacuum and in the presence of oxygen as a function of temperature and oxygen pressure. The vacuum pyrolysis is mainly due to “abnormal” structures. Volatiles are initially produced quite slowly, but the reaction accelerates subsequently. Arrhenius equations were derived for various ranges of volatile formation. A mechanism has been formulated consisting of random chain scission followed by depropagation (dimers to pentamers); simulatanously another zip reaction produces hydrogen. The thermal, oxidative degradation has been studied above and below the softening point of the polymer as a function of oxygen pressure. A first‐order reaction of volatile formation due to “abnormal” chain scission is followed by normal chain scission, which is also first order. The postulated mechanism leads initially to hydroperoxide formation. Arrhenius equations for volatile formation are different below and above the softening point. Oxygen consumption also follows a first‐order reaction with an energy of activation of 31.5 kcal/mole.

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