Preparation and performances of polyacrylic acid-Al3+/chitosan composite double network hydrogel

被引：0
|
作者：
Lu C. [1 ]
Yu Z. [1 ]
Yang Y. [1 ]
Zhang Y. [1 ]
机构：
[1] Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the Green Preparation and Application of Functional Materials, College of Chemistry and Chemical Engineering, Hubei Univ
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 12期
关键词：
chitosan; double network hydrogel; mechanical properties; sensing property; wearable strain sensor;
D O I：
10.13801/j.cnki.fhclxb.20211119.004
中图分类号：
学科分类号：
摘要：
Hydrogel materials are widely used in wearable strain sensors due to they have unique biomimetic structure, performances and biocompatibility. However, it is still a big challenge to prepare a hydrogel sensor with good mechanical properties and high conductivity. In this paper, a fully physically crosslinked, high-strength and sensitive polyacrylic acid-Al3+/chitosan composite double network hydrogel sensor was prepared by a simple two-step method. Firstly, chitosan (CS), polyacrylic acid (PAA) and ionic crosslinker Al3+ were physically mixed in water to form a pre-gel, and then the pre-gel was immersed in NaCl solution to prepare the target hydrogel sensor. The obtained ionized hydrogel sensor shows excellent mechanical properties (tensile strength as high as 765.4 kPa, elongation at break to 1 025%, and toughness of 4.13 MJ/m3). At the same time, the strain sensor based on the hydrogel exhibits excellent tensile sensitivity (sensitivity factor is about 1.54). The hydrogel sensor can repeatedly and stably detect large and small strains of human body. Therefore, the introduction of physical cross-linking network through the action of metal salts can improve the performances of hydrogels, which providing a new perspective for the design of multifunctional materials and their applications in electronic skins, wearable devices, and biosensors. © 2022 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：5901 / 5911
页数：10
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