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Effect of solution concentration and aging conditions on PMR-15 resinHigh performance liquid chromatography is utilized to evaluate the effect of temperature, solution concentration, and aging time on PMR-15 resin solutions. Fifty- and 70-wt percent PMR-15 resin solutions were prepared from the mixture of 5-norbornene-2,3-dicarboxylic ester (NE) acid, 4.4'-methylenedianiline (MDA), methanol, and 3,3',4.4.-benzophenonetetracarboxylic dimethyl ester (BTDE) acid solution. It is observed that in PMR-15 resin solution aged for 35 days at room temperature NE and MDA react to form amide and imide intermediates. The precipitation data reveal that in the 70-wt percent solution precipitation occurs after 12 days and in the 50-wt percent solution after 20 days; however, at lower temperatures (-11 C, and 2 C) no precipitation is detected. It is concluded that storage of resin solutions and powders at reduced temperatures extends shelf life by reducing the rate of imide formation.
Document ID
19860048375
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Roberts, G. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Vannucci, R. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1986
Publication Information
Publication: SAMPE Journal
Volume: 22
ISSN: 0091-1062
Subject Category
Nonmetallic Materials
Accession Number
86A33113
Distribution Limits
Public
Copyright
Other

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