Improved High-Temperature Resistant Matrix Resins.
Final contract rept. 29 Sep 83-29 Mar 85,
TRW SPACE AND DEFENSE SECTOR REDONDO BEACH CA
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A study was performed with the objective of developing matrix resins that exhibit improved thermo-oxidative stability over state of the art high temperature resins for use at temperatures up to 544K 700 deg F and air pressures up to 0.7 MPa 100 psia. The work was based upon a TRW discovered family of polyimides currently licensed to and marketed by Ethyl Corporation as EYMYDR resins. The approach investigated to provide improved thermo-oxidative properties was to use halogenated derivatives of the diamine, 2,2-bis4-4-AMINOPHENOXYPHENYLHEXAFLUOROPROPANE 4-BDAF. Polyimide neat resins and CelionR 12,000 composites prepared from fluorine substituted 4-BDAF demonstrated unexpectedly lower glass transition temperatures Tg and thermo-oxidative stabilities than the baseline 4-BDAFPMDA polymer.