
1.Laboratory of Waterborne Coating, Department of Coatings and Polymeric Materials, School of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
jiangzhong@jxstnu.com.cn (J.Z.)
liangshen@jxstnu.com.cn (L.S.)
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Zi-Jian Li, Jiang Zhong, Mao-Chen Liu, et al. Investigation on Self-healing Property of Epoxy Resins Based on Disulfide Dynamic Links. [J]. Chinese Journal of Polymer Science 38(9):932-940(2020)
Zi-Jian Li, Jiang Zhong, Mao-Chen Liu, et al. Investigation on Self-healing Property of Epoxy Resins Based on Disulfide Dynamic Links. [J]. Chinese Journal of Polymer Science 38(9):932-940(2020) DOI: 10.1007/s10118-020-2406-x.
Self-healing polymers based on dynamic crosslinkers have drawn rapidly increasing interest over the last decade. Here, a self-healable epoxy network with exchangeable disulfide bonds was synthesized by polymerizing two epoxies with an aromatic amine containing a disulfide bond. The bisphenol A diglycidyl ether (DGEBA) and poly(ethylene glycol) diglycidyl ether (DER736) were used as rigid and soft components, respectively. The crosslinking densities of studied polymers decreased with the increasing amount of DER736, resulting in the lower glassy temperature and weaker mechanical strength. The dynamic covalent network character of disulfide bond and its low active energy were also investigated through stress relaxation experiments at various temperatures. The self-healing performance of healable epoxy resins with varied flexibility was measured by tensile tests. The tensile strength of a full-cut sample was restored to 84% (13 MPa) of the initial values (16 MPa) at moderate temperature. Its healed fracture strain was up to 505%. Moreover, the effect of healing time and temperature on the self-healing properties was also studied. A model was proposed to investigate the self-repairing efficiency evolution with healing time, suggesting that hydrogen bonds mainly contributed to the initial sticking or interfacial adhesion while disulfide links and chain interdiffusion assisted time dependent reformation of networks to restore the original mechanical strength.
Self-healingEpoxy resinDisulfide bond
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