Jing Xiaokai, Zhang Sufeng, Zhang Fengjiao, Chi Congcong, Cui Shuyuan, Ding Hao, Li Jinrui
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper Based Functional Materials of China National Light Industry, National Demonstration Center for Experimental Light Chemistry Engineering Education, Xi'an 710021, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper Based Functional Materials of China National Light Industry, National Demonstration Center for Experimental Light Chemistry Engineering Education, Xi'an 710021, China.
Carbohydr Polym. 2024 Sep 15;340:122286. doi: 10.1016/j.carbpol.2024.122286. Epub 2024 May 20.
Due to the unsatisfactory mechanical properties of natural polymer-based conductive hydrogels, their applications are limited. Shaanxi Biangbiang noodles can be toughened by applying external mechanical forces through stretching and beating movements; this process provides inspiration for the preparation of high-strength hydrogels. In this paper, we propose a strategy for the preparation of ultrastrong and ultratough conductive hydrogels by directional prestretching and solvent exchange. Neatly arranged fiber bundles containing many intermolecular hydrogen bonds and metal ion coordination bonds are successfully constructed inside the prepared hydrogels. The hydrogel has exceptional mechanical properties, with a fracture stress exceeding 50 MPa, fracture strain approaching 105 %, fracture toughness exceeding 30 MJ m, and high conductivity reaching 11.738 ± 0.06 mS m. Impressively, the hydrogel can maintain its high mechanical properties after being frozen at an ultralow temperature of -80 °C for 7 days. Compared with other tough hydrogels, natural tendons and synthetic rubbers, the hydrogel exhibits excellent mechanical properties. The cellulose-based conductive hydrogel prepared in this study can be applied to robotic soft tissues (such as the Achilles tendon) that require high strength and are operated in extreme environments.
由于天然聚合物基导电水凝胶的机械性能不尽人意，其应用受到限制。陕西 biangbiang 面可以通过拉伸和拍打动作施加外部机械力来增韧；这一过程为制备高强度水凝胶提供了灵感。在本文中，我们提出了一种通过定向预拉伸和溶剂交换制备超强超韧导电水凝胶的策略。在制备的水凝胶内部成功构建了排列整齐的纤维束，其中包含许多分子间氢键和金属离子配位键。该水凝胶具有优异的机械性能，断裂应力超过 50 MPa，断裂应变接近 105%，断裂韧性超过 30 MJ m，高电导率达到 11.738±0.06 mS m。令人印象深刻的是，该水凝胶在 -80°C 的超低温下冷冻 7 天后仍能保持其高机械性能。与其他坚韧水凝胶、天然肌腱和合成橡胶相比，该水凝胶表现出优异的机械性能。本研究制备的纤维素基导电水凝胶可应用于需要高强度且在极端环境下运行的机器人软组织（如跟腱）。
