Molecular ordering of polypyromellitimide on heating to the temperature of thermolysis

Solid-body and wide-line high resolution 13C NMR methods have been used to investigate the effect of high temperature heating of films, fibres and powder of polypyromellitimide on the structure of the macromolecules and orientational properties of the fibres. It is shown that structural ordering ind...

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Published in:Polymer science USSR 1989, Vol.31 (11), p.2492-2497
Main Authors: Gribanov, A.V., Grebenkin, A.N., Yelkin, A.Yu, Kol'tsov, A.I., Sazanov, Yu.N.
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Language:English
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container_end_page 2497
container_issue 11
container_start_page 2492
container_title Polymer science USSR
container_volume 31
creator Gribanov, A.V.
Grebenkin, A.N.
Yelkin, A.Yu
Kol'tsov, A.I.
Sazanov, Yu.N.
description Solid-body and wide-line high resolution 13C NMR methods have been used to investigate the effect of high temperature heating of films, fibres and powder of polypyromellitimide on the structure of the macromolecules and orientational properties of the fibres. It is shown that structural ordering induced by high temperature heating affects the diphenyl oxide part of the macromolecule. The orientation factor of the fibres on heating rises significantly. On subsequent thermolysis the macromolecules draw nearer as a result of their crosslinkage.
doi_str_mv 10.1016/0032-3950(89)90268-2
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title Molecular ordering of polypyromellitimide on heating to the temperature of thermolysis
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