Thermally Stable Organic Polymers
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 1:1 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1994
- Accession Number
- ADA281380
Entities
People
- James L. McGrath
- Matthew Marrocco
- R. H. Boschan
Organizations
- Lockheed Martin Aeronautics