Ultrastretchable, Self-Healable Hydrogels Based on Dynamic Covalent Bonding and Triblock Copolymer Micellization,ACS Macro Letters

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Ultrastretchable, Self-Healable Hydrogels Based on Dynamic Covalent Bonding and Triblock Copolymer Micellization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-08-03 00:00:00 , DOI: 10.1021/acsmacrolett.7b00519
Peng Wang ₁ , Guohua Deng ₁ , Lanying Zhou ₁ , Zhiyong Li ₂ , Yongming Chen ₂

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Excellent mechanical properties and remarkable self-healing ability are difficult to unify in one hydrogel. We integrated acylhydrazone bonds and Pluronic F127 (PF127) micelle cross-linking, as two kinds of dynamic cross-links, in one system and developed hydrogels with superior stretchability, high toughness, and good self-healing ability. The hydrogel could stretch up to 117 times its initial length and self-heal approximately 85% of its initial strength within 24 h. The toughness of the hydrogel, indexed by the work of extension, W, reached 14.1 MJ m^–3. Energy dissipation occurred from the simultaneous decomposition of the PF127 micelles and chain sliding facilitated by the reconfiguration of the acylhydrazone bonds. This unique combination and dynamics led to pronounced hysteresis in the loading–unloading cycles, as well as good recovery and self-healing of the hydrogel. Dynamic cross-linking of the covalent acylhydrazone bonds was comparable to those of physical interactions, such as coordination and ionic bonding.

中文翻译：

基于动态共价键合和三嵌段共聚物胶束化的超拉伸自修复水凝胶

优异的机械性能和出色的自我修复能力很难统一在一种水凝胶中。我们将酰基hydr键和Pluronic F127（PF127）胶束交联（两种动态交联）集成在一个系统中，并开发了具有优异的可拉伸性，高韧性和良好的自修复能力的水凝胶。水凝胶可拉伸至其初始长度的117倍，并在24小时内自我恢复其初始强度的约85％。水凝胶的韧性（由延伸功W表示）达到14.1 MJ m ^–3。能量耗散是由于PF127胶束的同时分解和酰基bonds键的重新构型促进了链滑动。这种独特的组合和动力学特性导致在装卸循环中明显的磁滞现象，以及水凝胶的良好恢复性和自愈性。共价酰基hydr键的动态交联可与物理相互作用（如配位和离子键）相媲美。

更新日期：2017-08-03

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