2013•Polymer ChemistryRequires access

Self-healing systems based on disulfide–thiol exchange reactions

Mark P. F. Pepels, Ivo A. W. Filot, Bert Klumperman, Han Goossens

Abstract

New thermoset systems based on disulfide bonds were synthesized with self-healing capabilities. The self-healing 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.

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Key concepts: Thiol, Disulfide bond, Chemistry, Stress relaxation, Curing (chemistry), Thermosetting polymer, Relaxation (psychology), Polymer chemistry