Li Hongping, Huang Bai, Lv Zongming, Liu Jiang, Lan Fuxing, Fu Lihua, Lin Baofeng, Xu Chuanhui
School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China.
ACS Appl Mater Interfaces. 2025 Aug 13;17(32):46251-46265. doi: 10.1021/acsami.5c11639. Epub 2025 Jul 30.
Polyzwitterionic gels with both positively and negatively charged groups have attracted attention because of their excellent biocompatibility and high water absorption. However, insufficient mechanical properties due to fragile cross-linked networks and low stability due to aqueous solvents are still prominent. In this study, a deep eutectic solvent (DES) was introduced into the sulfobetaine zwitterionic monomer DMAPS([2-(methacryloyloxy)ethyl]dimethyl-(3-sulphonatopropyl)ammonium hydroxide) system. Based on the complexation strategy of sodium alginate (SA) polysaccharide, a polyzwitterionic network skeleton was constructed to prepare a composite eutectogel with high strength, environmental resistance, and high conductivity. The presence of DES enables polyzwitterionic gels to obtain excellent environmental stability at high and low temperatures. Notably, the introduction of SA significantly enhanced the tensile strength, Young's modulus, and toughness of the eutectogel without affecting the high transparency. This is attributed to the network of hydrogen bonding and electrostatic interactions within the matrix-filler constructed by the hydroxyl-rich and charged groups of SA in the presence of calcium ion complexation. At the same time, the polyzwitterionic network skeleton provides abundant binding sites for ion migration, which endows the eutectogels with excellent ionic conductivity (0.13-0.48 S·m). Thanks to its internal porous structure, the composite eutectogel can provide a stable piezoionic output and be used for pressure response and powering LED lights. In addition, supercapacitors and strain sensors assembled on the basis of composite eutectogels proved their potential for applications in areas such as energy storage and human motion monitoring. In conclusion, this study provides important guidance for the construction of biomass ionic network skeletons and the development of high-performance ion-conducting materials.
具有正负电荷基团的聚两性离子凝胶因其优异的生物相容性和高吸水性而备受关注。然而，由于交联网络脆弱导致的机械性能不足以及由于水性溶剂导致的稳定性低等问题仍然很突出。在本研究中，将一种深共熔溶剂（DES）引入到磺基甜菜碱两性离子单体DMAPS（[2-(甲基丙烯酰氧基)乙基]二甲基-(3-磺丙基)氢氧化铵）体系中。基于海藻酸钠（SA）多糖的络合策略，构建了一个聚两性离子网络骨架，以制备具有高强度、耐环境性和高导电性的复合低共熔凝胶。DES的存在使聚两性离子凝胶在高温和低温下都具有优异的环境稳定性。值得注意的是，SA的引入显著提高了低共熔凝胶的拉伸强度、杨氏模量和韧性，同时不影响其高透明度。这归因于在钙离子络合存在下，由SA富含羟基和带电基团构建的基质-填料内的氢键和静电相互作用网络。同时，聚两性离子网络骨架为离子迁移提供了丰富的结合位点，赋予低共熔凝胶优异的离子电导率（0.13 - 0.48 S·m）。由于其内部多孔结构，复合低共熔凝胶可以提供稳定的压离子输出，并用于压力响应和为LED灯供电。此外，基于复合低共熔凝胶组装的超级电容器和应变传感器证明了它们在能量存储和人体运动监测等领域的应用潜力。总之，本研究为生物质离子网络骨架的构建和高性能离子导电材料的开发提供了重要指导。
