Accession Number : ADA305432

Title :   Development of Autoclavable Addition-Type Polyimides.

Descriptive Note : Contractor rept.,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

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

PDF Url : ADA305432

Report Date : 14 FEB 1974

Pagination or Media Count : 150

Abstract : 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 deg K (390 deg F) to 505 deg K (450 deg F) under an applied pressure of 0.7 MN/sq m (100 psi) for time durations up to four hours. Upon oven postcure in air at 589 deg K (600 deg K), composite samples demonstrated high mechanical property retention at 561 deg K (550 deg F) after isothermal aging in air for 1000 hours. Promise was shown for shorter term mechanical property retention at 589 deg K upon exposure in air at this temperature. jg p2

Descriptors :   *ADDITION REACTIONS, *POLYIMIDE RESINS, *AUTOCLAVES, TEMPERATURE, MECHANICAL PROPERTIES, AGING(MATERIALS), FIBER REINFORCED COMPOSITES, CARBON FIBERS, SAMPLING, ISOTHERMS.

Subject Categories : Polymer Chemistry
      Laminates and Composite Materials
      Plastics
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE