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Thermally stable macromolecules.Man-made polymers are compared with certain naturally occurring polymers which have long been used at elevated temperatures. The pyrolysis of model compounds is discussed together with aspects of thermogravimetric analysis, torsional braid analysis, and questions of chemical and radiation stability. Some structure-property relationships are examined, giving attention to asbestos, mica, graphite, and diamond. Questions of bond strengths are investigated along with the stability of ladder polymers and some fundamental concepts in the synthesis of aromatic and heteroaromatic polymers. The substances considered include aromatic single-strand polymers, heteroaromatic polymers, polymers obtained by addition polymerizations, and nonhydrogen-containing polymers. Future trends are also explored.
Document ID
19730045330
Acquisition Source
Legacy CDMS
Document Type
Other - Collected Works
Authors
Pezdirtz, G. F.
Johnston, N. J.
(NASA Langley Research Center Chemistry and Physics Branch, Hampton, Va., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Subject Category
Chemistry
Accession Number
73A30132
Distribution Limits
Public
Copyright
Other

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