化工学报 ›› 2020, Vol. 71 ›› Issue (6): 2871-2879.DOI: 10.11949/0438-1157.20191567

• 材料化学工程与纳米技术 • 上一篇    下一篇

基于Diels-Alder动态共价键的含PEGDE片段自修复环氧树脂性能研究

张伦亮(),万里鹰(),黄军同,李喜宝,冯志军,陈智   

  1. 南昌航空大学材料学院,江西 南昌 330063
  • 收稿日期:2019-12-23 修回日期:2020-03-29 出版日期:2020-06-05 发布日期:2020-06-05
  • 通讯作者: 万里鹰
  • 作者简介:张伦亮(1992—),男,硕士研究生,503098846@qq.com
  • 基金资助:
    国家自然科学基金项目(51463016);中国博士后面上基金项目(2019M662860);上海航天科技创新基金项目(SAST2016053)

Properties of self-healing epoxy resin containing PEGDE segments based on Diels-Alder dynamic covalent bond

Lunliang ZHANG(),Liying WAN(),Juntong HUANG,Xibao LI,Zhijun FENG,Zhi CHEN   

  1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, China
  • Received:2019-12-23 Revised:2020-03-29 Online:2020-06-05 Published:2020-06-05
  • Contact: Liying WAN

摘要:

用含双烯体结构的呋喃甲胺,将硬段为双酚A型E-51环氧树脂(EP)和软段为PEGDE连接成线性大分子,并与含亲双烯体结构的双马来酰亚胺反应,制备出含热可逆Diels-Alder(DA)反应的软-硬-软结构的本征型自修复环氧树脂(EP-DA)。通过FTIR、DSC、TGA和电子万能试验机,对EP-DA结构和性能进行了表征。结果表明:DA动态共价键成功引入EP-DA,且DA正、逆反应的温度分别是60℃、122℃。当EP-DA链段中的PEGDE和EP含量各占50%时,其耐热性和拉伸强度达到最佳。EP-DA还具有良好的再加工性能和多次自修复性能,受损试样在60℃下修复4 h后,裂纹基本愈合,且第一次修复率可达88. 41%,同一试样经过三次修复后,其修复率仍可达68%以上。

关键词: 修复, Diels-Alder反应, 回收, 聚合物, 热可逆性

Abstract:

The dienyl structure-containing furan methylamine was used to link the hard segment E-51 epoxy resin (EP) modified by bisphenol A and the soft segment PEGDE to form linear macromolecules, and reacted with bismaleimide containing dienophilic structure to synthesize the soft-hard-soft structure of the intrinsic self-healing epoxy (EP-DA) via thermo reversible Diels-Alder (DA) reaction. The structure and performance of EP-DA were characterized by FTIR, DSC, TGA and electronic universal testing machine. The results show that: DA dynamic covalent bond is successfully introduced into EP-DA, and the temperature of DA forward and reverse reaction is 60 ℃ and 122 ℃ respectively. When the PEGDE and EP content in the EP-DA segment each accounts for 50%, its heat resistance and tensile strength reach the best, the epoxy resin exhibits good reprocessing properties and multiple self-repairing properties. After the damaged specimen is repaired at 60℃ for 4 h, the crack is healed, and the first repair rate is 88. 41%. After three repairs of the same specimen, the repair rate is still more than 68%.

Key words: repairing, Diels-Alder reaction, recovery, polymers, thermoreversibility

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