Self-healing biobased polybenzoxazine vitrimers for anticorrosion application

Biobased polybenzoxazine vitrimers with self-healing and shape memory properties were fabricated based on the dynamic exchange of disulfide bonds. Bis(4-aminophenyl) disulfide (APDS) was used as a curing agent to prepare cardanol/furfurylamine based polybenzoxazine (PC-f/APDS) vitrimers containing dynamic disulfide bonds. The content of disulfide bonds in the PC-f/APDS vitrimers could be adjusted by changing the amount of curing agent. The results of stress relaxation experiments showed that the dynamic exchange activation energies of the polybenzoxazine vitrimers were in the range of 53.9 to 115.7 kJ/mol. In addition, the polybenzoxazine coatings with dynamic disulfide bonds exhibited favorable hydrophobicity, corrosion resistance and self-healing properties. The scratch on the PC-f/APDS coating could disappear by heating at 120 degrees C. This study provides a design strategy for the development of high-performance polybenzoxazine vitrimers with self-healing properties.