High Performance Poly(amide-co- benzoxazine) Copolymers via New Route

摘要

Benzoxazine resins are a recently developed class of thermosetting polymers. The diversity of their applications comes from their unique properties that include excellent mechanical and thermal properties, low water absorption, rich molecular design flexibility, and near-zero shrinkage upon polymerization [1]. Classical benzoxazine monomers, as the first generation of polybenzoxazine precursors have been synthesized using amine, phenol, and formaldehyde to afford the monomer which then undergoes ring- opening polymerization to form the benzoxazine resins [2]. Polybenzoxazine derived via this approach are brittle due to the competition between the propagation of polymer chains and intramolecular hydrogen bonding. This leads to termination and branching of the network structure, resulting in low crosslinking density. To overcome these problems, main chain type benzoxazine polymer has been developed as a new precursor for polybenzoxazines. The final properties of the main chain type are a combination of the advantages of thermoplastic and thermosetting polymers. This unique class of thermoplastic/thermosetting crossover polymers would be attractive for many applications, such as aerospace, electronic packaging, printed circuit board, and membranes [3].