Development of Autoclavable Addition-Type Polyimides.

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

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Document Details

Document Type
Technical Report
Publication Date
Feb 14, 1974
Accession Number
ADA305432

Entities

People

  • C. H. Sheppard
  • M. K. O'rell
  • R. Jason Jones
  • R. W. Vaughan

Organizations

  • TRW Inc.

Tags

Communities of Interest

  • Advanced Electronics
  • Human Systems
  • Weapons Technologies

DTIC Thesaurus Topics

  • Anhydrides
  • Chemical Synthesis
  • Chemistry
  • Composite Material Fabrication
  • Composite Materials
  • Flexural Properties
  • Flexural Strength
  • Jet Propulsion
  • Magnetic Resonance
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Organic Chemistry

Readers

  • Polymer Science and Engineering.
  • Rocket Propulsion.