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Journal of Materials Science

, Volume 54, Issue 11, pp 8262–8275 | Cite as

Self-healing isocyanate microcapsules for efficient restoration of fracture damage of polyurethane and epoxy resins

  • Zhenglong He
  • Shuai Jiang
  • Na An
  • Xudong Li
  • Qifeng LiEmail author
  • Junwei Wang
  • Yuhua Zhao
  • Maoqing Kang
Composites

Abstract

Isophorone diisocyanate-loaded microcapsules were synthesized with controllable size for self-healing of structural polymer materials. The obtained microcapsules showed good compatibility with polymer resins, e.g., one-component epoxy and multi-component polyurethane/water glass structural materials. During the processing of composite self-healing materials, the highly cross-linked composite capsule wall ensured the integrity of microcapsules and prevented the leakage and degradation of reactive liquid isocyanates effectively. A relatively larger amount of self-healing agent could be released to the local cracks with the increasing size and content of microcapsules in polymer matrix which improved the self-healing efficiency of the composites. Based on the microcapsules with a diameter of ~96 μm, the healing efficiency of epoxy composites containing 15 wt% of capsules and polyurethane/water glass composites containing 20 wt% of capsules could reach to 105 and 101% recovery of fracture toughness, respectively. The crack-healing effect was further verified by scanning electron microscopy. Meanwhile, a possible self-healing mechanism of microcapsules to the cracks of composite polymer materials was proposed.

Notes

Acknowledgements

The authors gratefully acknowledge the financial support from the Major Science and Technology Project in Shanxi Province (No. 20111101058) and Shanxi Yubang Science and Technology Co., Ltd.

Supplementary material

10853_2018_3236_MOESM1_ESM.doc (729 kb)
Supplementary material 1 (DOC 729 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Coal Chemistry, Chinese Academy of SciencesTaiyuanChina
  2. 2.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and Ministry of Science and TechnologyShandong University of Science and TechnologyQingdaoChina
  3. 3.College of Mining and Safety EngineeringShandong University of Science and TechnologyQingdaoChina
  4. 4.National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and TechnologyQingdaoChina
  5. 5.National Engineering Research Center for Coal-Based SynthesisTaiyuanChina
  6. 6.University of Chinese Academy of SciencesBeijingChina

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