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Self-healing bio-based polybenzoxazine vitrimers for anticorrosion coatings
A novel coating system based on bio-based polybenzoxazine vitrimers combines hydrophobicity, corrosion resistance, and self-healing through dynamic disulphide bonds.
A Chinese research team has developed bio-based polybenzoxazine vitrimers with self-healing and shape memory properties. The coatings are based on the dynamic exchange of disulphide bonds, introduced via the curing agent bis(4-aminophenyl) disulphide (APDS) into a cardanol/furfurylamine-derived polybenzoxazine network.
The disulphide bonds allowed the tuning of coating properties by adjusting the curing agent content. Stress relaxation experiments revealed dynamic exchange activation energies ranging from 53.9 to 115.7 kJ/mol. The coatings exhibited strong hydrophobicity and notable corrosion resistance.
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Heat-induced self-healing
A key advantage of the developed systems lies in their self-healing capability: scratches on the PC-f/APDS coatings disappeared completely after heating to 120 °C. The study thus introduces a promising design strategy for high-performance, sustainable anticorrosive coatings with intrinsic self-repairing functionality.
Source: Wang, F., Lu, X. & Xin, Z., Self-healing biobased polybenzoxazine vitrimers for anticorrosion application. Prog. Org. Coat. 203, 109168 (2025).
