Preparation of high performance bio-based benzoxazine resin through a green solvent-free strategy for shape memory application

Preparing high performance shape memory bio-based benzoxazine resin through a green solvent-free strategy is an interesting issue with great challenge. Herein, a green solvent-free strategy is setup to synthesize bio-based benzoxazine monomer ( VFA-atpe ) from amine-terminated polyether and bio-based benzoxazine monomer containing aldehyde group; moreover, cured bio-based benzoxazine resin coded as poly(VFA-atpe) was prepared, of which the integrated performances were studied. Results show that poly(VFA-atpe) not only has high glass transition temperature (280 °C), but also exhibits ultra-high storage modulus (4.2 GPa) and tensile strength (90.4 ± 3.2 MPa), which are much higher than those of all bio-based benzoxazine resins reported so far. In addition, poly(VFA-atpe) shows good shape memory property, its shape recovery efficiency reaches 98%, and thus becomes the first bio-based benzoxazine resin with shape memory ability. These unique integrated performances of poly(VFA-atpe) are attributed to its special structure that simultaneously owns rigid segments and tough polyether.