Polymeric and Soft Materials Laboratory, School of Chemical Engineering, Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, PR China.
Department of Anatomy, School of Clinical Medicine, Changchun University of Chinese Medicine, Changchun 130117, PR China.
Mater Sci Eng C Mater Biol Appl. 2020 Jan;106:110168. doi: 10.1016/j.msec.2019.110168. Epub 2019 Sep 6.
Nowadays, hydrogels have been intensively explored due to their promising potential application in bioelectronics. However, the lack of self-healing performance limits the lifespan and stability of materials. Here, a stretchable, self-healing and conductive hydrogel is prepared via physical crosslinking including hydrogen bonding, hydrophobic association and complexation effect, endowing the hydrogels with stretchability of 1150%, tensile strength of 112 kPa, flexibility and puncture resistance. Besides, the hydrogels possess extraordinary conductive property with a conductivity of 0.0720 S cm and exhibit stable changes of resistance signals with a gauge factor of 2.506. Meanwhile, the hydrogels also exhibit adhesive performance due to the presence of catechol groups, and the maximum peeling adhesive strength could reach 23 N m. It is envisioned that the highly stretchable, self-healable, adhesive and conductive hydrogels would widen the application as the flexible strain sensors for soft robots, artificial limb, movement-monitoring equipment.
如今，水凝胶因其在生物电子学方面有应用前景而受到广泛关注。然而，其缺乏自修复性能限制了材料的使用寿命和稳定性。在这里，通过物理交联（包括氢键、疏水缔合和络合作用）制备了一种可拉伸、自修复和导电水凝胶，使水凝胶具有 1150%的拉伸性、112 kPa 的拉伸强度、柔韧性和耐刺穿性。此外，水凝胶具有非凡的导电性能，电导率为 0.0720 S cm，并且具有应变系数为 2.506 的稳定的电阻信号变化。同时，由于存在儿茶酚基团，水凝胶还具有粘附性能，最大剥离粘附强度可达 23 N m。预计这种高拉伸性、自修复性、粘附性和导电性水凝胶将拓宽其应用范围，可作为用于软体机器人、义肢、运动监测设备的柔性应变传感器。
