Self-healable and thiol-ene UV-curable waterborne polyurethane for anticorrosion coating

摘要

Thiol-ene ultraviolet-curable waterborne polyurethane (WPU) crosslinked networks capable of self-healing of cracks were developed for anticorrosion coating application. The healing mechanism is attributed to the rearrangement of the crosslinked networks caused by triethylamine-catalyzed thiol-disulfide exchange reaction proved by high-performance liquid chromatography, gel permeation chromatography, and rheology tests. The crack remendability can be repeated for at least two times as demonstrated by visual inspection. Moreover, the self-healing effect was further demonstrated in terms of corrosion and electrochemical tests. Comparatively, the control specimens without disulfide bonds were not self-healable. The present study provides a simple way for achieving self-healing WPU to conform to the trend of development of high performance and environmental friendly anticorrosive coatings. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47700.