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Development of autoclavable addition type polyimides (1974)

Orell, M. K. ; Sheppard, C. H. ; Jones, R. J. ; [et al.]

In: CASI

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Publication Date: 2019-07-13

Description: Two highly promising approaches to yield autoclavable addition-type polyimides were identified and evaluated in the program. Conditions were established for autoclave preparation of Hercules HMS graphite fiber reinforced composites in the temperature range of 473 K to 505 K under an applied pressure of 0.7 MN/m2 (100 psi) for time durations up to four hours. Upon oven postcure in air at 589 K, composite samples demonstrated high mechanical property retention at 561 K after isothermal aging in air for 1000 hours. Promise was shown for shorter term mechanical property retention at 589 K upon exposure in air at this temperature.

Keywords: MATERIALS, NONMETALLIC

Type: NASA-CR-121251 , TRW-21863-6013-RU-00

Format: application/pdf

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