NASA NTRS · 19940000191
Improved PMR Polyimides For Heat-Stable Laminates
Abstract
Second-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.
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Vannucci, R. D., Malarik, D. C., Papadapoulos, D. S., Waters, John F.. 1994-04-01. Improved PMR Polyimides For Heat-Stable Laminates. https://ntrs.nasa.gov/citations/19940000191
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