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Polyimides containing pendent trifluoromethyl groupsSeveral new polyimides containing trifluoromethyl groups were prepared from the reaction of various aromatic dianhydrides and two new diamines containing trifluoromethyl groups, 4,4'-bis(3-amino-5-trifluoromethylphenoxy)biphenyl and l,4-bis(3-amino-5-trifluoromethylphenoxy)benzene. The diamines were prepared from the aromatic nucleophilic displacement of the disodium salts of 4,4'-biphenol or hydroquinone with 3,5-dinitrobenzotrifluoride followed by hydrogenation of the resultant dinitro compounds. The thermally cured polyimides exhibited glass transition temperatures between 186 and 262 C. By thermogravimetric analysis, the polyimides exhibited 5 percent weight losses at 484-527 C in nitrogen and 452-506 C in air.
Document ID
19930058202
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Havens, S. J.
(Lockheed Engineering and Sciences Co. Hampton, VA, United States)
Hergenrother, P. M.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: High Performance Polymers
Volume: 5
Issue: 1
ISSN: 0954-0083
Subject Category
Nonmetallic Materials
Accession Number
93A42199
Distribution Limits
Public
Copyright
Other

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