Synthesis of Improved Moisture Resistant Polymers.
Final rept. 24 Jun 77-24 Aug 78,
TRW DEFENSE AND SPACE SYSTEMS GROUP REDONDO BEACH CA APPLIED TECHNOLOGY DIV
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The use of difluoromaleimide-capped prepolymers to provide improved moisture resistant polymers was investigated. Six different prepolymer formulations were prepared by two different methods. One method utilized the PMR approach to polyimides and the second method employed the normal condensation route to provide fully imidized prepolymers. Polymer spec mens cured at 505K 4500F exhibited adequate long-term stability in air at 477K 400 F. Moisture absorption studies were conducted on one polymer formulation. Neat polymer specimens exhibited weight gains of up to 2 ww after exposure to 100 relative humidity at 344K l60 F for 400 hours. MM
- Polymer Chemistry
- Laminates and Composite Materials