Accession Number:

ADA190119

Title:

Donor Acceptor Polymerization Chemistry as a Vehicle to Low Energy Cure Matrix Resins

Descriptive Note:

Interim rept. Feb 1986-Apr 1987

Corporate Author:

AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Report Date:

1987-11-01

Pagination or Media Count:

51.0

Abstract:

A recent study conducted by the National Materials Advisory Board has identified a need for matrix resins that can be prepared at ambient or near ambient room temperatures for onsite airfoil repair. This research project focuses on this problem through the synthesis of network polymers using donor acceptor polymerization chemistry. The di and tetrafunctional donors used in this study are based on vinyl ether chemistry, and di and tetrafunctional maleimides are the acceptors. Our first objective has been the synthesis of necessary donor and acceptor monomers and so we have proceeded to study a variety of synthetic approaches to create these needed compounds. In the case of donor monomers we have selected a palladium-assisted vinyl exchange reaction as the best route. Using this chemistry we have been able to successfully prepare 15 monomers based on vinyl ether chemistry. We have also synthesized an equal number of maleimides using a conventional synthetic chemistry, that being reaction of maletic anaydride with amine, followed by condensation of the maleimic acid to the maleimide itself. This chemistry requires a great deal of patience, yet if done properly, yield the necessary monomers in high purity. Keywords Donor acceptor polymerization, Bismaleimides, Vinyl ethers, Net work polymers, Maleimides vinylether, Copolymers.

Subject Categories:

  • Polymer Chemistry
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE