Accession Number:

ADA281380

Title:

Thermally Stable Organic Polymers

Descriptive Note:

Interim technical rept. 1 Feb 93-15 May 94,

Corporate Author:

LOCKHEED AERONAUTICAL SYSTEMS CO MARIETTA GA

Report Date:

1994-06-01

Pagination or Media Count:

19.0

Abstract:

Environmentally durable high temperature polymer matrix resins are critical in the design of near-term high performance supersonic aircraft. Currently available 6F based polymers are thermally stable, but are expensive and difficulty processable into void-free laminates. 3F polymers have demonstrated equivalent thermal stability and processability, but are amenable to more facile, environmentally acceptable synthetic procedures. In the current program, Semi-Interpenetrating Polymer Network SIPN blends of ethynyl and phenylethynyl terminated 3F polymers have been formulated and evaluated. A series of test panels were fabricated, using dielectric monitoring procedures, from a 11 3F SIPN blend Of phthalic anhydride terminated thermoplastic 3F oligomer with a phenylethynyl terminated thermosetting 3F oligomer. Solution prepregging techniques were used to prepare IM7 fiber prepreg tape. The void content of these laminates was somewhat higher than acceptable, probably due to the high melt viscosity. To address this problem, the remainder of the Program will be devoted to a powder prepreg evaluation by and Virginia Tech.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry
  • Plastics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE