School of Chemistry and Life Science, Changchun University of Technology, NO. 2055, Yanan Street, Changchun, 130012, PR China; Advanced Institute of Materials Science, Changchun University of Technology, NO. 2055, Yanan Street, Changchun, 130012, PR China.
School of Chemistry and Life Science, Changchun University of Technology, NO. 2055, Yanan Street, Changchun, 130012, PR China.
Carbohydr Polym. 2021 Mar 15;256:117563. doi: 10.1016/j.carbpol.2020.117563. Epub 2020 Dec 26.
Hydrogels that exhibit properties such as ultra-elongation, self-recovery, and self-healing have applications in sensors and many other fields. With these properties and applications in mind, we hypothesised that we could develop a strain-sensing hydrogel based on acrylic acid, stearyl methacrylate, cationic guar gum, and hexadecyl trimethyl ammonium bromide, without any covalent crosslinker. The hydrogels are instead held together by physical, non-covalent interactions such as ionic interactions, hydrogen bonding, and the hydrophobic effect, as suggested by spectroscopy and swelling experiments. The hydrogels exhibit many useful properties, such as: excellent stretching-up to 4267%-and almost complete reversion to their original state at a large strain of 500%, even after 20 successive cycles; temperature-dependent self-healing and self-recovery; and strain-sensitive conductivity that is attributable to the directional migration of ions. Because of these outstanding features, such as notch-insensitivity and the ability to withstand knotting under high strain, our hydrogels will be useful as flexible sensors.
具有超拉伸、自恢复和自修复等性能的水凝胶在传感器和许多其他领域有应用。考虑到这些特性和应用，我们假设可以开发一种基于丙烯酸、硬脂甲基丙烯酸酯、阳离子瓜尔胶和十六烷基三甲基溴化铵的应变传感水凝胶，而无需任何共价交联剂。正如光谱和溶胀实验所表明的，水凝胶是通过物理的、非共价相互作用结合在一起的，如离子相互作用、氢键和疏水作用。水凝胶具有许多有用的特性，例如：可拉伸至 4267%，在 500%的大应变下几乎完全恢复到原来的状态，即使在 20 次连续循环后也是如此；温度依赖性的自修复和自恢复；以及应变敏感的导电性，这归因于离子的定向迁移。由于这些突出的特性，如缺口不敏感性和在高应变下能够承受打结的能力，我们的水凝胶将作为柔性传感器很有用。
