Synthesis and Healing Behavior of Thermo-reversible Self-healing Epoxy Resins

Han-wen Zhao; Li-bang Feng; Xue-ting Shi; Yan-ping Wang; Yan-hua Liu

doi:10.11777/j.issn1000-3304.2017.17083

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Synthesis and Healing Behavior of Thermo-reversible Self-healing Epoxy Resins

Research Article | 更新时间：2021-01-26

- Synthesis and Healing Behavior of Thermo-reversible Self-healing Epoxy Resins
- Acta Polymerica Sinica Issue 3, Pages: 395-401(2018)
- 作者机构：
  
  兰州交通大学机电工程学院兰州 730070
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17083
  CLC：
- Published：20 March 2018，
  
  Received：1 April 2017，
  
  Revised：14 June 2017，
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Han-wen Zhao, Li-bang Feng, Xue-ting Shi, Yan-ping Wang, Yan-hua Liu. Synthesis and Healing Behavior of Thermo-reversible Self-healing Epoxy Resins. [J]. Acta Polymerica Sinica (3):395-401(2018)
DOI：

Han-wen Zhao, Li-bang Feng, Xue-ting Shi, Yan-ping Wang, Yan-hua Liu. Synthesis and Healing Behavior of Thermo-reversible Self-healing Epoxy Resins. [J]. Acta Polymerica Sinica (3):395-401(2018) DOI： 10.11777/j.issn1000-3304.2017.17083.

摘要

采用环氧氯丙烷与糠醇反应合成了含二烯体结构的环氧单体，并与含亲二烯体结构的双马来酰亚胺反应，制备得到基于热可逆Diels-Alder反应的自修复环氧树脂（EP-DA）.分别利用FTIR、DSC以及gel-sol转变对EP-DA的化学结构、热性能以及热可逆性进行了分析表征.结果表明，向EP-DA中引入了热可逆DA键，从而赋予环氧树脂良好的热可逆性和再加工性能，使环氧树脂实现自修复，并可使废弃环氧树脂能够得以回收再利用.模拟环氧树脂实际使用中受冲击破坏情况，采用宏观定性观察和弯曲载荷恢复定量测定相结合，对环氧树脂的修复行为和多次修复能力进行了考察，证实这种材料具有良好的自修复性能和多次重复修复能力，其一次修复效率达到了77.1%，同一试样经由3次冲击破坏—热处理后，其修复效率仍然高达53.9%.

Abstract

Cracks may appear in epoxy resins once suffered the external impact and pressure. If cracks can be remended by material itself

then the service life of the materials can be extended and severe incident can be avoided. Herein

an epoxy monomer containing diene is synthesized

via

the reaction between epichlorohydrin and furfuryl alcohol. A self-healing epoxy resin based on thermo-reversible Diels-Alder reaction (EP-DA) is prepared by the reaction between the resultant epoxy monomer and bismaleimide. The chemical structure

thermal property

and thermal reversibility of the prepared EP-DA are characterized by FTIR

DSC

and gel-sol transition. Results show that thermo-reversible DA bonds are introduced into the epoxy resin successfully. Consequently

EP-DA is endowed with excellent thermal reversibility and reprocessing performance. The self-healing behavior is examined by investigating both the crack evolution and the recovery of mechanical property. Based on the study about the effect of heat treatment on the crack repair in depth

the optimal heat treatment parameters are determined as 122 ℃/45 min and 67 ℃/36 h. By simulating the impact failure situation in actual state

the self-healing performance of the epoxy resin is investigated by a combination of qualitative observation and quantitative measurement of flexural load restoring. Results reveal that the crack narrows down and flexural strength enhances gradually with extended heat treatment. It is shown that the epoxy resins exhibit excellent self-healing performance

and the healing efficiency can achieve 77.1%. Meanwhile

cracks can be caused and repaired for more than three times. The healing efficiency can still reach 53.9% when the same sample has been impacted and repaired for three cycles. These manifest that the epoxy resins also show outstanding multiple self-healing performance. Additionally

the EP-DA exhibits excellent reprocessing performance

and PU-DA fragments can recombine together as a whole upon heating treatment at 122 ℃/2 h and 67 ℃/36 h. The result makes it possible for recycling the waste epoxy resins.

关键词

Diels-Alder反应环氧树脂热可逆性自修复再加工性

Keywords

Diels-Alder reactionEpoxy resinThermal reversibilitySelf-healingReprocessability

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Related Institution

School of Bailie Engineering & Technology, Lanzhou City University

Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering,Sun Yat-Sen University

Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High Performance Polymer Based Composites of Guangdong Province, School of Chemistry, Sun Yat-Sen University

Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology

School of Materials Science and Engineering, Tianjin University

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