Lan Ji, Li Yueshan, Yan Bin, Yin Chenxiao, Ran Rong, Shi Ling-Ying
College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
ACS Appl Mater Interfaces. 2020 Aug 19;12(33):37597-37606. doi: 10.1021/acsami.0c10495. Epub 2020 Aug 6.
A stretchable transparent double network ionogel composed of physically cross-linked poly(vinylidene fluoride--hexafluoropropylene) (P(VDF--HFP)) and chemically cross-linked poly(methyl methacrylate--butylmethacrylate) (P(MMA--BMA)) elastomer networks within [EMIM][TFSI] ionic liquid was fabricated through a facile one-pot thermal polymerization. The dual-network (DN) ionogel presents good mechanical performance (failure tensile stress 2.31 MPa, strain 307%) with a high loading of ionic liquid (70 wt %) for achieving required ionic conductivity (>0.1 S/m at room temperature). The transparent chemical cross-linked P(MMA--BMA) elastomer network endows high transparency (>93%) and high stretchability to the DN ionogel. The DN ionogel maintains good toughness, elasticity, and transparency in a wide temperature range (-40 to 80 °C) for the application in a harsh environment. In addition, the sensitivity of the DN ionogel to the change of environment temperature and deformation was detected and described. The practical potential of the DN ionogel in flexible electronic devices is further revealed by fabricating DN ionogel strain sensors to detect the movement of different human limbs including the bending of the finger, wrist, and elbow as well as the slight throat jitter during the swallowing and vocalization, showing fast response, high sensitivity, and good repeatability.
通过简便的一锅法热聚合制备了一种可拉伸透明双网络离子凝胶，它由在[EMIM][TFSI]离子液体中的物理交联聚（偏二氟乙烯-六氟丙烯）（P(VDF-HFP)）和化学交联聚（甲基丙烯酸甲酯-甲基丙烯酸丁酯）（P(MMA-BMA)）弹性体网络组成。双网络（DN）离子凝胶具有良好的机械性能（断裂拉伸应力2.31 MPa，应变307%），且离子液体负载量高（70 wt%），以实现所需的离子电导率（室温下>0.1 S/m）。透明的化学交联P(MMA-BMA)弹性体网络赋予DN离子凝胶高透明度（>93%）和高拉伸性。DN离子凝胶在宽温度范围（-40至80°C）内保持良好的韧性、弹性和透明度，适用于恶劣环境。此外，还检测并描述了DN离子凝胶对环境温度和变形变化的敏感性。通过制备DN离子凝胶应变传感器来检测不同人体肢体的运动，包括手指、手腕和肘部的弯曲以及吞咽和发声时轻微的喉咙抖动，进一步揭示了DN离子凝胶在柔性电子器件中的实际应用潜力，该传感器显示出快速响应、高灵敏度和良好的重复性。
