Endowing polymers with self-healing properties holds great promise for extending the life of materials and reducing environmental pressure. However, it is still a challenge to have both mechanically enhanced and self-healing properties. Dynamic reversible bonds can be broken and regenerated in response to external stimuli, thereby repairing localized cracks in the rubber matrix during use. Click reaction is an efficient and facile way to prepare self-healing rubbers with dynamic reversible bonds. Herein, we have obtained a self-healing styrene–butadiene rubber (SBR) (SLA) by introducing dynamic disulfide and hydrogen bonds in an “imitative” click reaction via using SBR as a model compound and lipoic acid (LA) as the cross-linking agent. The mechanical properties and self-healing capacity of SLA can be altered by adjusting the LA content. Furthermore, SLA-Zn was further prepared by introducing Zn²⁺ to form metal-oxygen coordination bonds with carboxyl groups. The effect of Zn²⁺ on the mechanical and self-healing properties has been systematically investigated. Compared with SLA, SLA-Zn has better mechanical properties and self-repairing ability, with a tensile strength up to 3.85 MPa and a repair efficiency of about 76%. This facile preparation method paves the way for the development of low-cost self-healing diolefin rubbers.

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基于动态可逆键合交联的二烯烃橡胶的制备及性能

赋予聚合物自愈性能对于延长材料寿命和减少环境压力具有很大的前景。然而，同时具有机械增强和自愈性能仍然是一个挑战。动态可逆键可以响应外部刺激而断裂和再生，从而在使用过程中修复橡胶基体中的局部裂纹。点击反应是制备具有动态可逆键的自修复橡胶的一种有效且简便的方法。在此，我们通过使用 SBR 作为模型化合物和硫辛酸 (LA) 作为交叉反应在“模拟”点击反应中引入动态二硫键和氢键，获得了自修复的丁苯橡胶 (SBR) (SLA)。连接剂。SLA的力学性能和自愈能力可以通过调整LA含量来改变。²⁺与羧基形成金属-氧配位键。已经系统地研究了Zn ²⁺对机械和自愈性能的影响。与SLA相比，SLA-Zn具有更好的力学性能和自修复能力，抗拉强度可达3.85 MPa，修复效率约为76%。这种简便的制备方法为开发低成本的自修复二烯烃橡胶铺平了道路。