Abstract
Anhydride cured epoxy vitrimers usually exhibit desired mechanical strength but poor toughness and slow transesterification rate. Therefore, the repairing property of the material was restricted. In this paper, polyurethane modified epoxy vitrimer (PU-Epv) was prepared. PU was introduced into the vitrimer system of tetrahydrophthalic anhydride cured epoxy to improve the toughness of the material. Meanwhile, because of the presence of amino ester, the transesterification reaction was promoted and the activation energy of the transesterification was only 33.59 kJ/mol. In the thermal welding experiment, the material could be welded at least five times, and scratches on the surface of the samples could be efficiently repaired within 30 min. The toughness of the material was improved without damaging the strength. Meanwhile, the hard thermosetting epoxy was endowed with excellent repairing properties to increase the service life of the material.
Funding source: Heibei Province Foundation for Returness
Award Identifier / Grant number: C20200369
Funding source: Colleges and Universities Science and Technology Research Project of Hebei Province
Award Identifier / Grant number: QN2018107
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 51703193
Acknowledgements
We would like to acknowledge Metastable Materials Science and Technology State Key Laboratory, College of Materials Science and Engineering, Yanshan University for help with DSC, FTIR, TG and mechanical properties testing. We need to acknowledge the group of Yingdan Liu for providing the rheometer.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors are grateful for the support and funding from the National Natural Science Foundation of China (no. 51703193), Colleges and Universities Science and Technology Research Project of Hebei Province (no. QN2018107), and Heibei Province Foundation for Returness (no. C20200369).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/polyeng-2020-0328).
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