Accession Number : ADA307456

Title :   Development of Autoclavable Polyimides

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

Personal Author(s) : O'Rell, M. K. ; Sheppard, C. H. ; Vaughan, R. W. ; Jones, R. J.

PDF Url : ADA307456

Report Date : 21 NOV 1974

Pagination or Media Count : 108

Abstract : A poly(Diels-Alder) (PDA) resin approach was investigated as a means to achieve autoclavability of high temperature resistant resin/fiber composites under mild fabrication procedures. The results of the study were highly promising and program objectives were achieved. Low void content Type A-S graphite reinforced composites were autoclave fabricated from a PDA resin/fiber prepreg prepared from an acetone:methanol:dioxane varnish. Autoclave conditions were 477 deg K (400 deg F) and 0.7 MN/sq meters (100 psi) for up to two hours duration. After postcure at temperatures up to 589 deg K (600 deg F), the composites demonstrated high initial mechanical properties at temperatures up to 561 deg K (550 deg F). The results from isothermal aging studies in air for 1000 hours indicated potential for long-term (>1000 hours) use at 533 deg K (500 deg F) and shorter-term (up to 1000 hours) at 561 deg K (550 deg F).

Descriptors :   *POLYIMIDE RESINS, *AUTOCLAVES, FIBERS, MECHANICAL PROPERTIES, AGING(MATERIALS), POLYMERS, HIGH TEMPERATURE, RESISTANCE, FABRICATION, GRAPHITE, VOIDS, METHANOLS, ACETONES, ISOTHERMS, REINFORCING MATERIALS, VARNISHES, DIOXANES.

Subject Categories : Polymer Chemistry
      Physical Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE