Matching combination of amorphous ionic hydrogel with elastic fabric enables integrated properties for wearable sensing

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Polymer Pub Date : 2024-11-07 DOI:10.1016/j.polymer.2024.127790
Bei Jiang , Zhaopeng Nie , Guiming Zhao , Bin Wang , Hongxing Xu , Xiansheng Zhang , Lili Wang
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Abstract

The combination of hydrogels and fabrics opens up significant opportunities for flexible materials, particularly in biomedicine and wearable technology. However, the weak interface caused by insufficient interactions between the different phases and the substantial modulus mismatch limit their broader application. In this research, flexible and amorphous polyvinyl alcohol (PVA) hydrogels were integrated with polar and elastic fabrics to create multifunctional composites via in-situ freeze-thawing technology. First, by incorporating antifreeze inorganic salts into the precursor solution, we effectively suppressed ice crystal growth during the cooling process, promoting a uniform and loosely aligned PVA chain structure. This led to the formation of an amorphous crosslinked network while simultaneously releasing free hydroxyl groups. These hydroxyl groups facilitate the formation of robust interfaces within the composite. In addition, an elastic fabric composed of a polyester-polyurethane fiber blend was selected. The polyester fibers, rich in carbonyl groups along their polymer chains, form strong hydrogen bonds with the free hydroxyl groups from the PVA hydrogel, creating a highly resilient interface. The polyurethane fibers contribute to a lower Young's modulus, as well as excellent elasticity and ductility, reducing the fabric's inherent stiffness and mitigating fiber pull-out failure. Further, the incorporation of CaCl2 not only created an environment rich in free ions, but also provided the amorphous structure with increasing spacing between adjacent polymer chains, facilitating the transportation of ions. Therefore, the composite exhibits adept sensing capabilities for intricate human body movements, fostering auspicious prospects in smart sensor applications.

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非晶离子水凝胶与弹性织物的匹配组合实现了可穿戴传感的综合特性
水凝胶与织物的结合为柔性材料带来了重大机遇,尤其是在生物医学和可穿戴技术领域。然而,由于不同相之间的相互作用不足而导致的界面薄弱以及模量的严重不匹配,限制了它们的广泛应用。在这项研究中,柔性无定形聚乙烯醇(PVA)水凝胶与极性弹性织物相结合,通过原位冻融技术制成了多功能复合材料。首先,通过在前驱体溶液中加入防冻无机盐,我们有效地抑制了冷却过程中冰晶的生长,促进了PVA链结构的均匀和松散排列。这导致了无定形交联网络的形成,同时释放出游离羟基。这些羟基有助于在复合材料内部形成坚固的界面。此外,还选择了一种由聚酯-聚氨酯纤维混合物组成的弹性织物。聚酯纤维的聚合物链上富含羰基,可与 PVA 水凝胶中的游离羟基形成牢固的氢键,从而形成高弹性界面。聚氨酯纤维具有较低的杨氏模量以及出色的弹性和延展性,从而降低了织物的固有刚度,减轻了纤维拉出故障。此外,CaCl2 的加入不仅创造了一个富含游离离子的环境,还使无定形结构中相邻聚合物链之间的间距增大,从而促进了离子的运输。因此,这种复合材料对复杂的人体运动具有良好的传感能力,为智能传感器的应用开辟了广阔的前景。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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