Investigation on Self-healing Property of Epoxy Resins Based on Disulfide Dynamic Links

Zi-Jian Li; Jiang Zhong; Mao-Chen Liu; Jin-Chuang Rong; Kun Yang; Ji-Yong Zhou; Liang Shen; Fei Gao; Hai-Feng He

doi:10.1007/s10118-020-2406-x

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Investigation on Self-healing Property of Epoxy Resins Based on Disulfide Dynamic Links

ARTICLE | Updated：2020-04-27

- Investigation on Self-healing Property of Epoxy Resins Based on Disulfide Dynamic Links
- Chinese Journal of Polymer Science Vol. 38, Issue 9, Pages: 932-940(2020)
- Affiliations：
  
  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
- Author bio：
  
  jiangzhong@jxstnu.com.cn (J.Z.)
  liangshen@jxstnu.com.cn (L.S.)
- Funds：
- DOI：10.1007/s10118-020-2406-x
  CLC：
- Received：14 January 2020，
  
  Revised：2020-2-2，
  
  Accepted：17 February 2020，
  
  Online First：27 April 2020，
  
  Published：2020-09
- Accepted：
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Li, Z. J.; Zhong, J.; Liu, M. C.; Rong, J. C.; Yang, K.; Zhou, J. Y.; Shen, L.; Gao, F.; He, H. F. Investigation on self-healing property of epoxy resins based on disulfide dynamic links. Chinese J. Polym. Sci. 2020, 38, 932–940

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, 2020, 38(9): 932-940.
Li, Z. J.; Zhong, J.; Liu, M. C.; Rong, J. C.; Yang, K.; Zhou, J. Y.; Shen, L.; Gao, F.; He, H. F. Investigation on self-healing property of epoxy resins based on disulfide dynamic links. Chinese J. Polym. Sci. 2020, 38, 932–940 DOI： 10.1007/s10118-020-2406-x.

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, 2020, 38(9): 932-940. DOI： 10.1007/s10118-020-2406-x.

摘要

Abstract

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.

关键词

Keywords

references

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