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Quantitative analysis of PMR-15 polyimide resin by HPLCThe concentration of individual components and of total solids of 50 wt pct PMR-15 resin solutions was determined using reverse-phase HPLC to within + or - 8 percent accuracy. Acid impurities, the major source of impurities in 3,3', 4,4'-benzophenonetetracarboxylic acid (BTDE), were eliminated by recrystallizing the BTDE prior to esterification. Triester formation was not a problem because of the high rate of esterification of the anhydride relative to that of the carboxylic acid. Aging of PMR-15 resin solutions resulted in gradual formation of the mononadimide and bisnadimide of 4,4'-methylenedianiline, with the BTDE concentration remaining constant. Similar chemical reactions occurred at a reduced rate in dried films of PMR-15 resin.
Document ID
19870061040
Document Type
Reprint (Version printed in journal)
Authors
Roberts, Gary D. (NASA Lewis Research Center Cleveland, OH, United States)
Lauver, Richard W. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Journal of Applied Polymer Science
Volume: 33
ISSN: 0021-8995
Subject Category
CHEMISTRY AND MATERIALS (GENERAL)
Distribution Limits
Public
Copyright
Other