Tough Hydrogels Designed for a Stretch-Induced Decrease in Electrical Resistance Using Tandem Host-Guest and Ionic Cross-Linking.

IF 5.1 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2025-07-07 DOI:10.1021/acsmacrolett.5c00347

May Myat Noe,Akihide Sugawara,Yoshinori Takashima,Hiroshi Uyama

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Abstract

Developing hydrogels that simultaneously exhibit mechanical toughness, interfacial adhesion, and a stretch-induced decline in electrical resistance remains a key challenge for soft and stretchable devices. Here, we present a supramolecular hydrogel system based on a tandem cross-linking strategy, formed through host-guest complexation between β-cyclodextrin (β-CD) and hydrophobic anions (TFSI- or NFO-), followed by sequential ionic interactions between anions and imidazolium polycations. The supramolecular hydrogels formed stable networks with enhanced mechanical strength, moderate swelling, and tunable adhesion, governed by the alkyl chain length of polycations, counteranions, and matrix polymers. Under tensile strain, the tandem cross-linked hydrogels exhibited a distinctive reduction in resistance, attributed to the sacrificial dissociation of dynamic cross-links that increase the anion mobility and facilitate ion transport. This supramolecular approach provides a versatile platform for designing robust, multifunctional hydrogels suited for mechanically demanding and stimuli-responsive applications with strong potential in flexible and wearable electronics.

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使用串联主-客体和离子交联设计用于拉伸诱导电阻降低的坚韧水凝胶。

开发同时表现出机械韧性、界面粘附性和拉伸引起的电阻下降的水凝胶仍然是软性和可拉伸设备的关键挑战。在这里，我们提出了一个基于串联交联策略的超分子水凝胶体系，通过β-环糊精（β-CD）和疏水阴离子（TFSI-或NFO-）之间的主客体络合形成，然后阴离子和咪唑聚阳离子之间进行顺序离子相互作用。超分子水凝胶形成稳定的网络，具有增强的机械强度，适度的膨胀和可调的附着力，由聚阳离子，反阴离子和基质聚合物的烷基链长度控制。在拉伸应变下，串联交联水凝胶表现出明显的阻力降低，这是由于动态交联的牺牲解离增加了阴离子的迁移率，促进了离子的运输。这种超分子方法为设计坚固的多功能水凝胶提供了一个通用平台，适用于机械要求高和刺激响应的应用，在柔性和可穿戴电子产品中具有强大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Macro Letters 化学-

CiteScore

10.40

自引率

3.40%

发文量

209

审稿时长

1 months

期刊介绍： ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.