期刊
CARBOHYDRATE POLYMERS
卷 256, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117563
关键词
Hydrogel; Self-recovery; Ultra-elongation; Self-healing
资金
- National Natural Science Foundation of China [21503022]
- Science and Technology Development Plan of Jilin Province, China [202002033JC]
In this study, a hydrogel was developed based on non-covalent interactions, exhibiting excellent stretching ability, self-healing, and strain-sensitive conductivity for sensor applications. The hydrogel showed outstanding features such as notch-insensitivity and ability to withstand knotting under high strain.
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.
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