由高分子离子液体和 Vitrimer 化学设计的可修复离子弹性体,ACS Applied Polymer Materials

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由高分子离子液体和 Vitrimer 化学设计的可修复离子弹性体
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2022-12-12 , DOI: 10.1021/acsapm.2c01635
Fengdi Li ₁ , Giao. T. M. Nguyen ₁ , Cédric Vancaeyzeele ₁ , Frédéric Vidal ₁ , Cédric Plesse ₁

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对全固态柔性、可拉伸和可穿戴设备的需求不断增长，推动了对无液体和可拉伸离子弹性体的需求。这些离子导电材料在运行过程中会反复变形，使其容易损坏。因此，赋予交联材料以愈合能力似乎特别有希望提高它们的耐久性。在这里，基于N的季铵化合成了带有烯丙基官能团的聚合离子液体（PIL）-烯丙基咪唑与聚（表氯醇）和聚（环氧乙烷）（PEO）的共聚物橡胶。然后将所得 PIL 与动态硼酸酯交联剂 2,2'-(1,4-亚苯基)-双 [4-硫醇-1,3,2-二氧硼烷] (BDB) 通过硫醇-烯交联“单击“照片添加”。还引入了 PEO 悬挂链作为自由体积增强剂。通过调整动态交联剂和悬挂链内容研究了由此产生的全固体 PIL 网络的特性。调整交联剂和悬挂链的数量产生柔软 (0.2 MPa)、可拉伸 (300%) 和高导电离子弹性体 (1.6 × 10 ^–5 S·cm ^–1在 30 °C）。BDB 之间的缔合交换反应赋予这些材料以 vitrimer 特性，例如愈合和可回收性。回收材料能够保留其原有的机械性能和离子电导率。这些可修复的 PIL 网络在需要具有高离子电导率、修复能力和可再加工性的固体电解质的应用中显示出巨大的潜力。

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Healable Ionoelastomer Designed from Polymeric Ionic Liquid and Vitrimer Chemistry

The growing demand for all-solid flexible, stretchable, and wearable devices has boosted the need for liquid-free and stretchable ionoelastomers. These ionic conducting materials are subjected to repeated deformations during functioning, making them susceptible to damage. Thus, imparting cross-linked materials with healing ability seems particularly promising to improve their durability. Here, a polymeric ionic liquid (PIL) bearing allyl functional groups was synthesized based on the quaternization of N-allylimidazole with a copolymer rubber of poly(epichlorohydrin) and poly(ethylene oxide) (PEO). The resulting PIL was then cross-linked with dynamic boronic ester cross-linkers 2,2′-(1,4-Phenylene)-bis[4-mercaptan-1,3,2-dioxaborolane] (BDB) through thiol–ene “click” photoaddition. PEO dangling chains were additionally introduced for acting as free volume enhancers. The properties of the resulting all-solid PIL networks were investigated by tuning dynamic cross-linkers and dangling chain contents. Adjusting the cross-linker and dangling chain quantities yielded soft (0.2 MPa), stretchable (300%), and highly conducting ionoelastomers (1.6 × 10^–5 S·cm^–1 at 30 °C). The associative exchange reaction between BDB endowed these materials with vitrimer properties such as healing and recyclability. The recycled materials were able to retain their original mechanical properties and ionic conductivity. These healable PIL networks display a great potential for applications requiring solid electrolytes with high ionic conductivity, healing ability, and reprocessability.

更新日期：2022-12-12

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