Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, PR China.
Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, PR China; College of home and art design, Northeast Forestry University, Harbin 150040, PR China.
Int J Biol Macromol. 2024 Mar;260(Pt 2):129378. doi: 10.1016/j.ijbiomac.2024.129378. Epub 2024 Jan 11.
Conductive hydrogels have been widely used as sensors owing to their tissue-like properties. However, the synthesis of conductive hydrogels with highly adjustable mechanical properties and multiple functions remains difficult to achieve yet highly needed. In this study, lignin hydrogel characterized by frost resistance, UV resistance, high conductivity, and highly adjustable mechanical properties without forming by-products was prepared through a rapid in-situ polymerization of acrylic acid/zinc chloride (AA/ZnCl) aqueous solution containing lignin extract induced by the reversible quinone-catechol redox of the ZnCl-lignin system at room temperature. Results revealed that the PAA/ZnCl/lignin hydrogel exhibited mechanical properties with tensile stress (ranging from 0.08 to 3.28 MPa), adhesion to multiple surfaces (up to 62.05 J m), excellent frost resistance (-70-20 °C), UV resistance, and conductivity (0.967 S m), which further endow the hydrogel as potential strain and temperature sensor with wide monitor range (0-300 %), fatigue resistance, and quick response (70 ms for 150 % strain). This study proposed and developed a green, simple, economical, and efficient processing method for a hydrogel sensor in flexible wearable devices and man-machine interaction fields.
导电水凝胶由于具有类似组织的特性，因此被广泛用作传感器。然而，具有高度可调节机械性能和多种功能的导电水凝胶的合成仍然难以实现，但需求量很大。在这项研究中，通过室温下 ZnCl-木质素体系的可逆醌-儿茶酚氧化还原反应，在含有木质素提取物的 AA/ZnCl 水溶液中快速原位聚合，制备了具有耐冻、耐紫外线、高导电性和高度可调节机械性能的木质素水凝胶，而不会形成副产物。结果表明，PAA/ZnCl/木质素水凝胶具有拉伸应力（0.08-3.28 MPa）、多种表面附着力（高达 62.05 J m）、优异的耐冻性（-70-20°C）、耐紫外线和导电性（0.967 S m），进一步使水凝胶具有作为潜在应变和温度传感器的能力，具有较宽的监测范围（0-300%）、耐疲劳性和快速响应（150%应变时为 70 ms）。本研究提出并开发了一种用于柔性可穿戴设备和人机交互领域的水凝胶传感器的绿色、简单、经济、高效的加工方法。
