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Modulation of Self-healing of Polyion Complex Hydrogel by Ion-specific Effects
Hui-li Liu,Guang-ming Liu,Guang-zhao Zhang
Author NameAffiliationE-mail
Hui-li Liu Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Guang-ming Liu Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China gml@ustc.edu.cn 
Guang-zhao Zhang Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China  
Abstract:
We have prepared polyion complex (PIC) hydrogel consisting of poly(3-(methacryloylami no) propyl-trimethylamonium chloride) and poly(sodium p-styrenesulfonate) polyelectrolytes via a two-step polymerization procedure and have investigated specific ion effects on the selfhealing of the PIC hydrogel. Our study demonstrates that the mechanical properties of the PIC hydrogel are strongly dependent on the type of the ions doped in the hydrogel. The ion-specific effects can be used to modulate the self-healing efficiency of the PIC hydrogel. As the doped anions change from kosmotrops to chaotropes, the self-healing efficiency of the PIC hydrogel increases. A more chaotropic anion has a stronger ability to break the ionic bonds formed within the hydrogel, leading to a higher efficiency during the healing.
Key words:  Polyelectrolyte hydrogel  Self-healing  Ion-specific effects  Mechanical property  Counterions
FundProject:
基于离子特异性效应调控聚电解质络合物水凝胶自修复性能
刘慧丽,刘光明,张广照
摘要:
通过两步聚合法制备了甲基丙烯酰胺丙基三甲基氯化铵(MPTC)和苯乙烯磺酸钠(NaSS)聚电解质络合物(PMPTC/PNaSS)水凝胶,研究了基于离子特异性效应调控聚电解质络合物水凝胶的自修复性能.通过不同种类离子对PMPTC/PNaSS水凝胶的特异性掺杂,可影响水凝胶中聚电解质链间静电相互作用以及链的运动能力,从而控制水凝胶的力学性能以及自修复性能.结果表明,当掺杂阴离子从结构构造型的强水化离子变为结构破坏型的弱水化离子,聚电解质络合物水凝胶的自修复效率会逐渐增加.主要是由于结构破坏型阴离子可以更加有效地打开水凝胶中的离子键,提高聚电解质链的运动能力和自修复效率.
关键词:  聚电解质水凝胶  自修复  离子特异性效应  力学性能  反离子
DOI:10.1063/1674-0068/29/cjcp1605109
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