New thermoset systems based on disulfide bonds were synthesized with self-healing capabilities. The selfhealing mechanism is not related to disulfide–disulfide exchange reactions, but to thiol–disulfide exchange reactions that are pH-dependent. Stress relaxation experiments showed large relaxation for systems having PTM2 as a curing agent, which indicates that the system can rearrange its molecular structure as a mechanism to release stress. However, relaxation rates decreased for samples tested longer after production. This indicates the disappearance of thiol-groups probably caused by thiol–thiol oxidation.
Pepels, M. P. F., Filot, I. A. W., Klumperman, B., & Goossens, J. G. P. (2013). Self-healing systems based on disulfide-thiol exchange reactions. Polymer Chemistry, 4(18), 4955-4965. https://doi.org/10.1039/c3py00087g