Thermoplastic toughening of PHT's

摘要

Polyhexahydrotriazine (PHT) and polyhemiaminal (PHA) materials chemically modified to include thermoplastic polymer bridging groups, and methods of making such materials, are disclosed. The materials are formed by a process that includes heating a mixture comprising i) a solvent, ii) paraformaldehyde, iii) a diamine monomer comprising two primary aromatic amine groups, and iv) a polymer diamine at a temperature of about 20° C. to less than 150° C. This heating step forms a stable PHA in solution, which can be isolated. The PHA includes covalently bonded thermoplastic polymer groups. The PHA is then heated at a temperature of 150° C. to about 280° C., thereby converting the PHA material to a PHT material that includes covalently bonded thermoplastic polymer groups.

主权项

1. A method, comprising:
forming a polymer diamine mixture having M1 of at least about 1000 g/mole; forming a reaction mixture comprising i) the polymer diamine mixture, ii) a solvent, iii) paraformaldehyde, and iv) a monomer comprising two primary aromatic amine groups and having the general structurewherein L′ is a divalent linking group selected from the group consisting of *—O—*, *—S—*, *—N(R′)—*, *—N(H)—*, *—R″—*, and combinations thereof, wherein R′ comprises at least one carbon and R″ comprises at least one carbon; and
heating the reaction mixture at a temperature of 150° C. to about 280° C., thereby forming a polyhexahydrotriazine (PHT).