One-Step in Situ Synthesis of Tough and Highly Conductive Ionohydrogels with Water-Retentive and Antifreezing Properties.
One-Step in Situ Synthesis of Tough and Highly Conductive Ionohydrogels with Water-Retentive and Antifreezing Properties.
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DOI：
10.1021/acsami.3c06028
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发表时间：
2023-06
影响因子：
9.5
通讯作者：
Yuxi Li;Yujun Liu;Xu-Ming Xie
中科院分区：
文献类型：
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作者：
Yuxi Li;Yujun Liu;Xu-Ming Xie
柔性导电凝胶是一种很有前途的智能和可穿戴电子材料。本文通过简单的一步原位自由基聚合制备了具有多功能的坚韧VSNPs-PAA-Zr 4+离子水凝胶，其通过多价乙烯基官能化的二氧化硅纳米粒子（VSNPs）和Zr 4+与PAA链中羧基之间的金属配位进行双重交联。在聚合过程中引入具有稳定价态的Zr 4+使得能够直接形成大量的金属配位交联以用于足够的能量耗散，克服了不稳定的金属离子对聚合过程的抑制。同时，VSNPs作为多价交联剂和有效的应力传递中心。所得VSNPs-PAA-Zr 4+离子水凝胶显示出高达25 MJ m-3的高韧性、3010 kPa的高拉伸强度和1360%的大断裂伸长率，同时沿着可靠的粘合性能。由于使用了IL/水二元溶剂，离子水凝胶具有优异的保水性和抗冻性。此外，大量移动的离子的存在使得VSNPs-PAA-Zr 4+离子水凝胶具有4.77 S m-1的上级电导率和9.04的应变灵敏度，是一种很有前途的智能和可穿戴的应变传感器材料。
Flexible and conductive gels are promising materials as intelligent and wearable electronics. Herein, through a facile one-step in situ free-radical polymerization, tough VSNPs-PAA-Zr4+ ionohydrogels with integrated multiple functionalities are prepared, which are dually cross-linked by multivalent vinyl-functionalized silica nanoparticles (VSNPs) and metal coordination between Zr4+ and the carboxyl groups in PAA chains. The incorporation of Zr4+ with stable valency during polymerization enables the direct formation of a large number of metal coordination cross-links for adequate energy dissipation, overcoming the inhibition of unstable metal ions on the polymerization process. Meanwhile, VSNPs serve as multivalent cross-linkers and effective stress transfer centers. The obtained VSNPs-PAA-Zr4+ ionohydrogels show high toughness of up to 25 MJ m-3 with a high tensile strength of 3010 kPa and a large elongation at break of 1360%, along with reliable adhesive performance. Attributed to use of an IL/water binary solvent, the ionohydrogels possess excellent water-retentive and antifreezing abilities. Moreover, the existence of large quantities of mobile ions endows the VSNPs-PAA-Zr4+ ionohydrogels with a superior conductivity of 4.77 S m-1 and a high strain sensitivity with a gauge factor (GF) of 9.04, which are promising materials as intelligent and wearable strain sensors.