Polyhemiaminal and polyhexahydrotriazine materials from 1,4 conjugate addition reactions

摘要

Polyhemiaminal (PHA) and polyhexahydrotriazine (PHT) materials are modified by 1,4 conjugate addition chemical reactions to produce a variety of molecular architectures comprising pendant groups and bridging segments. The materials are formed by a method that includes heating a mixture comprising solvent(s), paraformaldehyde, aromatic amine groups, aliphatic amine Michael donors, and Michael acceptors, such as acrylates. The reaction mixtures may be used to prepare polymer pre-impregnated materials and composites containing PHT matrix resin.

主权项

1. A method of producing a composite article, comprising:
forming a mixture comprising a solvent, paraformaldehyde, an aromatic amine, a Michael addition donor, and a Michael addition acceptor; heating the mixture to a first temperature to produce a mixture of a first viscosity; coating a work piece with the mixture of the first viscosity to produce a prepreg; heating the prepreg to a second temperature to produce a B-stage prepreg of a second viscosity; cooling the B-stage prepreg; forming an article from the B-stage prepreg; and heating the article at a temperature from about 150° C. to about 280° C. to form a cured composite containing polyhexahydrotriazine.