Liu Yafei, Feng Huixia, Gui Yujie, Chen Ting, Xu Haidong, Huang Xiaoxue, Ma Xuemei
School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
School of Chemistry and Chemical Engineering, Normal College for Nationalities, Qinghai Normal University, Xining 810008, China.
Polymers (Basel). 2023 Jan 4;15(2):250. doi: 10.3390/polym15020250.
Conductive hydrogels with high electrical conductivity, ductility, and anti-dryness have promising applications in flexible wearable electronics. However, its potential applications in such a developing field are severely hampered by its extremely poor adaptability to cold or hot environmental conditions. In this research, an "organic solvent/water" composite conductive hydrogel is developed by introducing a binary organic solvent of EG/HO into the system using a simple one-pot free radical polymerization method to create TiCT MXene nanosheet-reinforced polyvinyl alcohol/polyacrylamide covalently networked nanocomposite hydrogels (PAEM) with excellent flexibility and mechanical properties. The optimized PAEM contains 0.3 wt% MXene has excellent mechanical performance (tensile elongation of ~1033%) and an improved modulus of elasticity (0.14 MPa), a stable temperature tolerance from -50 to 40 °C, and a high gauge factor of 10.95 with a long storage period and response time of 110 ms. Additionally, it is worth noting that the elongation at break at -40 °C was maintained at around 50% of room temperature. This research will contribute to the development of flexible sensors for human-computer interaction, electronic skin, and human health monitoring.
具有高导电性、延展性和抗干燥性的导电水凝胶在柔性可穿戴电子设备中具有广阔的应用前景。然而，在这样一个发展中的领域，其潜在应用受到其对寒冷或炎热环境条件极差的适应性的严重阻碍。在本研究中，通过使用简单的一锅自由基聚合法将EG/HO二元有机溶剂引入体系，制备了一种“有机溶剂/水”复合导电水凝胶，以制备具有优异柔韧性和机械性能的TiCT MXene纳米片增强聚乙烯醇/聚丙烯酰胺共价网络纳米复合水凝胶（PAEM）。优化后的含0.3 wt% MXene的PAEM具有优异的机械性能（拉伸伸长率约为1033%）和改善的弹性模量（0.14 MPa），在-50至40°C的温度范围内具有稳定的耐受性，高应变系数为10.95，储存期长，响应时间为110 ms。此外，值得注意的是，在-40°C时的断裂伸长率保持在室温下的50%左右。本研究将有助于开发用于人机交互、电子皮肤和人体健康监测的柔性传感器。
