Accession Number : ADA305011

Title :   Synthesis of Improved Moisture Resistant Polymers.

Descriptive Note : Final rept. 24 Jun 77-24 Aug 78,

Corporate Author : TRW DEFENSE AND SPACE SYSTEMS GROUP REDONDO BEACH CA APPLIED TECHNOLOGY DIV

Personal Author(s) : O'Rell, M. K.

PDF Url : ADA305011

Report Date : 15 MAR 1979

Pagination or Media Count : 52

Abstract : 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% (w/w) after exposure to 100% relative humidity at 344K (l60 F) for 400 hours. (MM)

Descriptors :   *POLYMERS, *MATRIX MATERIALS, *MOISTUREPROOFING, *POLYIMIDE RESINS, AIRCRAFT, AGING(MATERIALS), FIBER REINFORCED COMPOSITES, ANHYDRIDES, AEROSPACE CRAFT, MONOMERS, ABSORPTION, CURING, EPOXY RESINS, REACTANTS(CHEMISTRY), HUMIDITY, CONDENSATION, POLYIMIDE PLASTICS.

Subject Categories : Polymer Chemistry
      Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE