Design of acetylene-modified bio-based tri-functional benzoxazine and its copolymerization with bismaleimide for performance enhancement

Developing of high-performance thermosets with outstanding thermal properties has attracted increasing attention. Herein, a combined strategy, acetylene modification and copolymerization with bismaleimide, has been utilized for a novel bio-based tri-functional benzoxazine monomer. The monomer (RES-pa) was successfully synthesized using biomass resources, resveratrol, as raw material. Three systems with different ratios (RES-pa: bismaleimide = 1:0, 1:1, 1:2) were designed. The thermal derived polymerization of three systems was monitored by DSC and in situ FT-IR. Thermal stability of derived thermosets was systemically investigated in detail by dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). Specially, poly(RES-pa- co -DDM-BMI-1/1) is found to show a high T g value of 374 °C and Td 10 of 387 °C. Promisingly, the combined strategy used in the work may grant efficient way for design and preparation of high-performance thermosets.