基于邻苯二酚氢键作用的自修复弹性体的合成与表征

Synthesis and Characterization of Self-healing Elastomers Based on Hydrogen Bonding of Catechol

将邻苯二酚乙烯基单体(DMA)与丙烯酸丁酯(BA)通过自由基共聚得到无规聚合物BA-Co-DMA,并对其进行结构表征和性能测试。结果表明:邻苯二酚引入丙烯酸酯聚合物中,得到力学性能和自修复性能优异的热塑性弹性体;傅里叶转换红外光谱分析表明,BA-Co-DMA的邻苯二酚之间形成氢键,赋予其良好的自修复性能;原子力显微镜观察到的相分离表明,邻苯二酚基团之间的相互作用产生聚集体,在BA-Co-DMA中形成物理交联网络;高温促进了分子运动加剧,BA-Co-DMA断裂试样在60℃下修复12h的自修复效果良好。

In this study,a random copolymer(BA-co-DMA) of catechol vinyl monomer(DMA)and butyl acrylate(BA)was prepared,and its structure and properties were characterized. The results showed that,when catechol was introduced into acrylate polymer,the resulted random copolymer was a thermoplastic elastomer with excellent mechanical properties and self-healing properties. FTIR measurement demonstrated that BA-co-DMA formed hydrogen bonds between catechol groups,which endowed the material with excellent self-healing properties. The phase separation observed by AFM revealed that the interaction between catechol groups led to the formation of aggregates and physical cross-linked network within the polymers. The fracture of BA-co-DMA sample could be self-repaired after 12 hours at 60 ℃ and the high healing efficiency was achieved by increasing the molecular mobility with high temperature.