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Improved PMR Polyimides For Heat-Stable LaminatesSecond-generation PMR-type polyimides (PMR-II polyimides) of enhanced thermo-oxidative stability prepared by substitution of para-aminostyrene (PAS) end caps for nadic-ester (NE) end caps used in prior PMR-II polyimides. Laminates unidirectionally reinforced with graphite fibers and made with PAS-capped resins exhibited thermo-oxidative stabilities significantly greater than those of similar laminates made with NE-capped PMR-II resins. One new laminate exhibited high retention of weight and strength after 1,000 h of exposure to air at 371 degrees C.
Document ID
19940000191
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Vannucci, R. D. (Case Western Reserve Univ.)
Malarik, D. C. (Case Western Reserve Univ.)
Papadapoulos, D. S. (Case Western Reserve Univ.)
Waters, John F. (Case Western Reserve Univ.)
Date Acquired
August 16, 2013
Publication Date
April 1, 1994
Publication Information
Publication: NASA Tech Briefs
Volume: 18
Issue: 4
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
LEW-15303
Accession Number
94B10191
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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