The combination of mechanical properties, self-healing capability and recyclability is practically considered for silicone elastomers. Here, thermoplastic silicone elastomers (TPSEs) were prepared via cross-linking solely by coulombic interactions between carboxylic acid groups on the polydimethylsiloxane (PDMS) side chains and commercially available zinc oxide (ZnO). To obtain an ideally desirable combination of great mechanical strength, elasticity and self-healing properties, three linear vinyl-containing PDMS samples were synthesized via a cyclic trimeric phosphazene base (CTPB) catalyzed ring-opening polymerization and then used as a precursor to afford carboxylic acid functionalized PDMS (PDMS-g-COOH) via an efficient thiol–ene click reaction. The final TPSEs were formed by simple mixing of PDMS-g-COOH with ZnO. The mechanical properties and self-healing abilities of dynamic salt-bonding networks were tuned by varying the molecular weights of PDMS precursors and the molar ratio of COOH/ZnO, characterized by dynamic mechanical analysis (DMA) and tensile and rheological measurements. The obtained PDMS-g-COOH/ZnO composites exhibited an excellent mechanical strength of >5 MPa, good elasticity up to 1300% of the original length and fast self-healing efficiency of 83.5% at 80 °C for 4 h. This simple and universal approach provided new insights into next-generation high-performance TPSEs.

中文翻译：

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基于库仑相互作用的机械强度高，可拉伸性高的热塑性有机硅弹性体的设计

对于有机硅弹性体，实际上考虑了机械性能，自修复能力和可回收性的结合。在此，仅通过聚二甲基硅氧烷（PDMS）侧链上的羧酸基团与市售氧化锌（ZnO）之间的库仑相互作用，通过交联制备热塑性有机硅弹性体（TPSE ）。为了获得理想的机械强度，弹性和自愈性能的理想组合，通过环状三聚磷腈碱（CTPB）催化的开环聚合反应合成了三个线性的含乙烯基的PDMS样品，然后将其用作制备羧酸的前体酸官能化的PDMS（PDMS- g -COOH）通过有效的硫醇烯点击反应。通过将PDMS- g -COOH与ZnO进行简单混合即可形成最终的TPSE 。通过改变PDMS前体的分子量和COOH / ZnO的摩尔比来调节动态盐键网络的力学性能和自修复能力，并通过动态力学分析（DMA）以及拉伸和流变学测量来表征。所获得的PDMS- g -COOH / ZnO复合材料在80°C下保持4 h时，具有优异的机械强度，> 5 MPa，高达原始长度的1300％的良好弹性，以及83.5％的快速自愈效率。这种简单而通用的方法为下一代高性能TPSE提供了新的见解。