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 polyhexahydrotriazine (PHT), comprising:
a plurality of trivalent hexahydrotriazine groups having the structure a plurality of divalent bridging groups having the structureand
a plurality of divalent thermoplastic polymer groups having the structure *-Q-* each having a molecular weight of at least 1000 g/mole, wherein each starred bond of each hexahydrotriazine group is covalently linked to a starred bond of a divalent bridging group or a starred bond of a divalent polymer group, each starred bond of a given bridging group is linked to a respective starred bond of a hexahydrotriazine group, and each starred bond of a divalent polymer group is linked to a respective starred bond of a hexahydrotriazine group.