By Prepolymer Process

the polyfunctional thiol terminated polyurethane oligomer was prepared with polyfunctional polyether polyols

isophorone diisocyanate(IPDI)

and by adding an end-capping reagent-mercaptoethanol. The crosslinked polyurethane containing disulfide bonds was then polymerized by oxidative coupling of the thiol moieties using sodium iodide/hydrogen peroxide.The resultant polymers were characterized by FT-IR. The effect of self-healing condition

self-healing efficiency

the function of disulfide bond and hydrogen bond in self-healing process were analyzed by means of tensile test and contrast test

etc. The results showed that the crosslinked polyurethane containing aliphatic disulfide bonds can achieve efficient self-healing at room temperature

and does not require additional catalyst and external stimulus.After being cut in half with a razor blade and simple contact

the samples were exposed to natural light for 48 hours

the tensile strength can be restored to 95% of the original

and the elongation at break can be restored to 100% of original. which hydrogen bonds among urethane moieties contributed up to about 30% of the healing efficiency.