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, synthesized, and scaled up to quantities amenable to prepregging. Solution prepregging techniques were used by YLA, Inc. to fabricate 12" unidirectional prepreg tape. A series of test panels was fabricated from the IM7 prepreg tape, using dielectric monitoring procedures, from a 1:1 3F SIPN blend of phthalic anhydride terminated thermoplastic 3F oligomer with a phenylethynyl terminated 3F oligomer. Solution prepregging techniques were used to prepare unidirectional IM7 fiber prepreg tape. The primary goals of the program, including conception, synthesis development, scaleup, prepregging and panel fabrication, were all met. The void content of the laminates was somewhat higher than acceptable, probably due to the high melt viscosity and solvent inclusion. A plan, using powder prepregging, was offered to alleviate the void problem. (jg)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1994
- Accession Number
- ADA290755
Entities
People
- James L. McGrath
- Matthew Marrocco
- R. S. Boschan
Organizations
- Lockheed Martin Aeronautics