Influence of softening on the kinetics of thermodegradation of polyimides

It is shown that degradation of polyimides takes place more rapidly in the softened than in the vitrified state, and that softening is accompanied by an abrupt rise in the effective activation energy. Equations have been derived to relate the magnitude of this jump in the activation energy to the co...

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Bibliographic Details
Published in:Polymer science USSR 1986, Vol.28 (11), p.2674-2681
Main Authors: Laius, L.A., Dergacheva, Ye.N., Zhukova, T.I., Bessonov, M.I.
Format: Article
Language:English
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Summary:It is shown that degradation of polyimides takes place more rapidly in the softened than in the vitrified state, and that softening is accompanied by an abrupt rise in the effective activation energy. Equations have been derived to relate the magnitude of this jump in the activation energy to the coefficient of thermal expansion and compressibility of the polymer, as well as to its heat capacity.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(86)90304-7