Donor Acceptor Polymerization Chemistry as a Vehicle to Low Energy Cure of Matrix Resins: Evolution of the 2-Tg Concept to Produce High Tg Polymers at Ambient Temperatures

摘要

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 on site airfoil repair. The research described herein 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. Meeting our first objective required the synthesis of the necessary donor and acceptor monomers, and consequently we examined a variety of synthetic approaches to create these compounds. In the case of donor monomers, we selected a palladium assisted vinyl exchange reaction as the best route. Using this chemistry we successfully prepared 15 monomers based on vinyl ether chemistry. Keywords: Donor acceptor polymerization, Bismaleimides, Vinyl ethers, Net work polymers, Maleimide vinylether, Copolymers. (MJM)