高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (3): 572-581.doi: 10.7503/cjcu20190454

• 高分子化学 • 上一篇    下一篇

基于多重可逆作用的自修复聚氨酯弹性体的制备及性能

盛叶明,程波,卢珣   

  1. 华南理工大学材料科学与工程学院, 广州 510630
  • 收稿日期:2019-08-14 出版日期:2020-01-09 发布日期:2019-12-31
  • 通讯作者: 卢珣
  • 作者简介:卢 珣, 男, 博士, 副教授, 主要从事自修复材料方面的研究. E-mail: luxun@scut.edu.cn
  • 基金资助:
    国家自然科学基金(No.51873065);广东省自然科学基金资助(No.2017A030313277)

Research on Self-healing Polypolyurethane Elastomer Based on Multiple Reversible Action

SHENG Yeming,CHENG Bo,LU Xun   

  1. School of Materials Science and Engineering, South China University of Technolgy, Guangzhou 510630, China
  • Received:2019-08-14 Online:2020-01-09 Published:2019-12-31
  • Contact: Xun LU
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.51873065);the Natural Science Foundation of Guangdong Province, China(No.2017A030313277)

摘要:

在聚氨酯主链上引入可逆二硫键, 同时使用硼酸构建的硼酸酯键作为可逆交联点, 使聚氨酯内部形成交联网络结构, 制备了一种兼具高强度、 高韧性及高修复效率的自修复聚氨酯弹性体. 红外光谱、 动态力学分析、 力学测试、 电子显微镜及修复测试结果表明, 制备的自修复聚氨酯具有硬而韧的特性, 原样强度高达23.3 MPa, 断裂伸长率可达1177%, 并且修复条件温和, 剪断拼接的试样经60 ℃, 24 h修复后可恢复99%的原样强度, 且该修复过程可重复多次进行. 此外, 该材料还具有多通道修复特性, 通过热修复或水辅助热修复的方式均可实现材料的修复, 并且水辅助热修复速率更快.

关键词: 多通道自修复, 聚氨酯, 多重可逆作用, 二硫键, 硼酸酯

Abstract:

Self-healing materials received widely concerns because of its ability for prolonging the service life of materials and fulfilling the need for sustainable development in recent years. To solve the problem that self-healing materials can’t do both well in self-healing property and mechanical property, we prepared a self-healing polyurethane elastomer with high strength, high toughness and high repair efficiency in this paper, on the basis of the designability of polyurethanes, we introduced disulfide bond to the polyurethane main chainis and used boric acid ester bond constructed using boric acid as a reversible cross-linking point to form the cross-linked network structure. The materials was characterized by infrared spectroscopy, dynamic mechanical analysis, mechanical test, electron microscope and self-healing test. The results show that the self-healing polyurethane has the characteristics of hard and tough, which the strength of the original sample has 23.3 MPa, the elongation at break can reach 11.77%, and can self-heal at a mild conditions. After repairing at 60 ℃ for 24 h, the original strength of the sample can be restored to 99%, and the self-healing process can be repeated many times. In addition, the material has the characteristics of multi-channel self-healing, which can be repaired by means of thermal self-healing or water-assisted thermal self-healing, and the latter is faster.

Key words: Multi-channel self-healing, Polyurethane, Multiple reversible action, Disulfide bond, Boronic ester

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