Cheng Yanpeng, Zang Junjiao, Zhao Xin, Wang Hang, Hu Yingcheng
Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University) of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China; Engineering Research Center of Advanced Wooden Materials of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China.
Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University) of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China; Engineering Research Center of Advanced Wooden Materials of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China.
Carbohydr Polym. 2022 Feb 1;277:118872. doi: 10.1016/j.carbpol.2021.118872. Epub 2021 Nov 8.
The use of ion-conductive hydrogels in strain sensors with high mechanical properties, conductivity, and anti-freezing properties is challenging. Here, high-strength, transparent, conductive, and anti-freezing organohydrogels were fabricated through the radical polymerization of polyacrylamide (PAM)/sodium alginate (SA)/TEMPO-oxidized cellulose nanofibrils (TOCNs) in a dimethyl sulfoxide (DMSO)/water solution, followed by soaking in a CaCl solution. The resulting organohydrogels demonstrated a high strength (tensile strength of 1.04 MPa), stretchability (681%), transparency (>84% transmittance), and ionic conductivity (1.25 S m). The organohydrogel-based strain sensor showed a high strain sensitivity (GF = 2.1). In addition, due to a synergistic effect between the DMSO/HO binary solvent and CaCl, the organohydrogel remained flexible (could bend 180°) and conductive (1.01 S m) at -20 °C. Interestingly, the TOCNs exerted a reinforcing effect on both the mechanical properties and ionic conductivity. This research provides a novel strategy to prepare ion-conductive organohydrogels with good mechanical properties, conductivity, and anti-freezing properties for use as flexible electronic materials.
在具有高机械性能、导电性和抗冻性能的应变传感器中使用离子导电水凝胶具有挑战性。在此，通过在二甲基亚砜（DMSO）/水溶液中使聚丙烯酰胺（PAM）/海藻酸钠（SA）/2,2,6,6-四甲基哌啶-1-氧自由基（TEMPO）氧化纤维素纳米纤维（TOCNs）进行自由基聚合，随后浸泡在氯化钙溶液中，制备出了高强度、透明、导电且抗冻的有机水凝胶。所得有机水凝胶表现出高强度（拉伸强度为1.04兆帕）、拉伸性（681%）、透明度（透光率>84%）和离子电导率（1.25西门子/米）。基于该有机水凝胶的应变传感器显示出高应变灵敏度（应变系数GF = 2.1）。此外，由于DMSO/H₂O二元溶剂与氯化钙之间的协同效应，该有机水凝胶在-20℃时仍保持柔韧性（可弯曲180°）和导电性（1.01西门子/米）。有趣的是，TOCNs对机械性能和离子电导率均产生增强作用。本研究为制备具有良好机械性能、导电性和抗冻性能的离子导电有机水凝胶用作柔性电子材料提供了一种新策略。
