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首页> 外文期刊>ACS applied materials & interfaces >Ionic Conductivity of Polyelectrolyte Hydrogels
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Ionic Conductivity of Polyelectrolyte Hydrogels

机译：聚电解质水凝胶的离子电导率

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摘要

Polyelectrolytes have many important functions in both living organisms and man-made applications. One key property of polyelectrolytes is the ionic conductivity due to their porous networks that allow the transport of water and small molecular solutes. Among polyelectrolytes, zwitterionic polymers have attracted huge attention for applications that involve ion transport in a polyelectrolyte matrix; however, it is still unclear how the functional groups of zwitterionic polymer side chains affect their ion transport and swelling properties. In this study, zwitterionic poly(carboxybetaine acrylamide), poly(2-methacryloyloxyethyl phosphorylcholine), and poly(sulfobetaine methacrylate) hydrogels were synthesized and their ionic conductivity was studied and compared to cationic, anionic, and nonionic hydrogels. The change of the ionic conductivity of zwitterionic and nonionic hydrogels in different saline solutions was investigated in detail. Zwitterionic hydrogels showed much higher ionic conductivity than that of the widely used nonionic poly(ethylene glycol) methyl ether methacrylate hydrogel in all tested solutions. For both cationic and anionic hydrogels, the presence of mobile counterions led to high ionic conductivity in low salt solutions; however, the ionic conductivity of zwitterionic hydrogels surpassed that of cationic and ionic hydrogels in high salt solutions. Cationic and anionic hydrogels showed much higher water content than that of zwitterionic hydrogels in deionized water; however, the cationic hydrogels shrank significantly with increasing saline concentration. This work provides insight into the effects of polyelectrolyte side chains on ion transport. This can guide us in choosing better polyelectrolytes for a broad spectrum of applications, including bioelectronics, neural implants, battery, and so on.
机译：聚电解质在生物体和人造应用中具有许多重要的功能。聚电解质的一个关键特性是由于其多孔网络，其允许水和小分子溶质的多孔网络引起的离子传导性。在聚电解质中，两性离子聚合物吸引了涉及聚电解质基质中离子传输的应用的巨大关注;然而，尚不清楚两性离子聚合物侧链的官能团如何影响其离子输送和溶胀性质。在该研究中，合成了两性离子聚（羧基丙基丙烯酰胺），聚（2-甲基丙烯酰氧基乙基磷胆碱）和聚（磺基甲基丙烯酸酯）水凝胶，并研究了它们的离子电导率，并与阳离子，阴离子和非离子水凝胶进行比较。详细研究了不同盐溶液中两性离子和非离子水凝胶的离子电导率的变化。在所有测试溶液中，两性离子水凝胶比广泛使用的非离子聚（乙二醇）甲基醚甲基丙烯酸酯水凝胶更高的离子电导率。对于阳离子和阴离子水凝胶，移动抗衡离子的存在导致低盐溶液中的高离子电导率;然而，两性离子水凝胶的离子电导率超过了高盐溶液中阳离子和离子水凝胶的离子电导率。阳离子和阴离子水凝胶显示出比去离子水中的两性离子水凝胶更高的水含量;然而，阳离子水凝胶随着盐水浓度的增加而严重缩小。这项工作提供了洞察聚电解质侧链对离子转运的影响。这可以指导我们选择更好的聚电解质，以广泛的应用，包括生物电体化，神经植入物，电池等。

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