Synthesis and properties of a novel bio-based benzoxazine resin with excellent low-temperature curing ability

A novel bio-based benzoxazine resin (diphenolic acid/furfurylamine benzoxazine resin, PDPA-F-Boz) was prepared by using bio-based diphenolic acid, furfurylamine and paraformaldehyde as raw materials. The structure of DPA-F-Boz monomer was characterized by Fourier transform infrared spectroscopy, H-1 NMR and C-13 NMR, and then its curing reaction and the thermal stability of the cured PDPA-F-Boz were analyzed. Compared with the traditional fossil-based benzoxazine (bisphenol A/aniline benzoxazine, BPA-A-Boz) and the bio-based benzoxazine (diphenolic acid/aniline benzoxazine, DPA-A-Boz), DPA-F-Boz monomer showed the lowest curing temperature, and PDPA-F-Boz had the highest residual char ratio at 800 degrees C and the lowest degradation rate at the peak temperature. Meanwhile, the total heat release, peak heat release rate and heat release capacity of PDPA-F-Boz were much lower than those of PBPA-A-Boz and PDPA-A-Boz. Thus, PDPA-F-Boz showed excellent low-temperature curing ability and thermal stability. (c) 2019 Society of Chemical Industry