Xie Fang, Ping Zhongxin, Xu Wanting, Zhang Fenghua, Dong Yuzhen, Li Lianjie, Zhang Chengsen, Gong Xiaobo
School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China.
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China.
Polymers (Basel). 2022 Nov 12;14(22):4879. doi: 10.3390/polym14224879.
Rubber materials are widely used in aerospace, automotive, smart devices and artificial skin. It is significant to address the aging susceptibility of conventional vulcanized rubber and to impart it rapid self-healing performance for destructive crack damage. Herein, a novel supramolecular rubber elastomer is prepared by introducing metal coordination between carboxyl-terminated polybutadiene and polystyrene-vinylpyridine copolymer. Based on the metal coordination interaction, the elastomer exhibits shape memory and self-healing properties. Moreover, a rapid closure-repair process of destructive cracks is achieved by presetting temporary shapes. This shape memory-assisted self-repair model is shown to be an effective means for rapid repair of severe cracks. An approach to enhance the mechanical and self-healing properties of elastomer was demonstrated by adding appropriate amounts of oxidized carbon nano-onions (O-CNO) into the system. The tensile strength of the elastomer with an O-CNOs content of 0.5 wt% was restored to 83 ± 10% of the original sample after being repaired at 85 °C for 6 h. This study confirms that metal coordination interaction is an effective method for designing shape memory self-healing rubber elastomer. The shape memory-assisted self-healing effect provides a reference for the rapid self-repairing of severe cracks.
橡胶材料广泛应用于航空航天、汽车、智能设备和人造皮肤等领域。解决传统硫化橡胶的老化敏感性并赋予其对破坏性裂纹损伤的快速自愈性能具有重要意义。在此，通过在羧基封端的聚丁二烯和聚苯乙烯-乙烯基吡啶共聚物之间引入金属配位作用，制备了一种新型超分子橡胶弹性体。基于金属配位相互作用，该弹性体表现出形状记忆和自愈性能。此外，通过预设临时形状实现了破坏性裂纹的快速闭合修复过程。这种形状记忆辅助的自修复模型被证明是快速修复严重裂纹的有效手段。通过向体系中添加适量的氧化碳纳米洋葱（O-CNO），展示了一种增强弹性体力学性能和自愈性能的方法。含0.5 wt% O-CNOs的弹性体在85℃下修复6 h后，拉伸强度恢复至原始样品的83±10%。该研究证实金属配位相互作用是设计形状记忆自愈合橡胶弹性体的有效方法。形状记忆辅助的自愈效应为严重裂纹的快速自修复提供了参考。
