One-step synthesis of intelligent ionohydrogels toughened with carboxyl-Al3+ coordination facilitated by ionic liquids
One-step synthesis of intelligent ionohydrogels toughened with carboxyl-Al3+ coordination facilitated by ionic liquids
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DOI：
10.1016/j.polymer.2023.126223
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发表时间：
2023-07
期刊：
影响因子：
4.6
通讯作者：
Yuxi Li;Xu-Ming Xie
中科院分区：
文献类型：
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作者：
Yuxi Li;Xu-Ming Xie
导电水凝胶是一种很有前途的柔性电子材料，金属配位被广泛用于制备坚韧和导电性的水凝胶。而一些金属离子，例如，Al 3+在水凝胶中高度水合，不能形成有效的配位交联来增强水凝胶。通过引入亲水性离子液体（[EMIM]OAc）破坏Al 3+的水化状态，促进了Al 3+与PAA链中羧基的配位。通过一步原位自由基聚合，制备了坚韧VSNPs-PAA-Al 3+离子水凝胶，该凝胶由多价VSNPs和羧基-Al 3+配位交联双重交联。所获得的离子水凝胶显示出27.3MJ m-3的高韧性，具有4280 kPa的拉伸强度和1360%的大断裂伸长率。此外，由于大量移动的离子的存在，VSNPs-PAA-Al 3+离子水凝胶具有上级电导率（1.60 S m− 1）和高应变灵敏度（GF = 9.83），是可穿戴应变传感器的潜在候选材料。
Conductive hydrogels are promising materials as flexible electronics, and metal coordination is widely used to prepare tough and conductive hydrogels. While, some metal ions, e.g., Al3+is highly hydrated in hydrogels, which cannot form effective coordination cross-links to strengthen hydrogels. Herein, by introducing hydrophilic ionic liquids ([EMIM]OAc) to disrupt the hydration state of Al3+, the formation of coordination between Al3+and carboxyl groups in PAA chains is facilitated. Through a one-step in situ free-radical polymerization, tough VSNPs-PAA-Al3+ionohydrogels are facilely prepared, which are dually cross-linked by multivalent VSNPs and carboxyl-Al3+coordination cross-links. The obtained ionohydrogels show high toughness of 27.3 MJ m−3, with tensile strength of 4280 kPa and large elongation at break of 1360%. Moreover, due to the existence of numerous mobile ions, the VSNPs-PAA-Al3+ionohydrogels possess superior conductivity of 1.60 S m−1and high strain sensitivity withGFof 9.83, which are potential candidates as wearable strain sensors.