Jia Qianqian, Wang Xinyu, Lu Chuanwei, Zhang Daihui, Gao Shishuai, Yu Juan, Wang Chunpeng, Wang Jifu, Yong Qiang, Chu Fuxiang
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
China Regional Research Centre, International Centre for Genetic Engineering and Biotechnology (ICGEB), No 8 Taohongjing,Jiangsu Province, Taizhou 225316, China.
Int J Biol Macromol. 2025 Mar;294:139429. doi: 10.1016/j.ijbiomac.2024.139429. Epub 2025 Jan 3.
Eutectic gels as important conductive polymers have promising practical applications in wearable electronic devices. However, the development of the ultra-stretchable and self-adhesive eutectic gel for multifunctional flexible sensors remains a challenge. Here, a lignin-enabled ultra-stretchable eutectic gel (LEG) integrating with excellent self-adhesion and high conductivity is prepared through polymerizable deep eutectic solvents (PDES) treated lignin followed by in-situ polymerization. In this LEG, the lignin macromolecules are utilized as important mediators to build dynamic crosslinking points in the polyacrylic acid (PAA) networks via hydrogen bond interactions. The dynamic disruption and reconstruction of the hydrogen bonds between the mobile PAA chain and dynamic crosslinking points ensure the high integrity of the crosslinking network to realize the ultra-stretchability (about 4845 %). Additionally, the abundant phenol groups of lignin endow the LEG with robust self-adhesion, which allows the LEG to seamlessly adhere to the different substrates. Based on these features, the LEGs are assembled as wearable strain sensors with high sensitivity, fast response time, and long-term sensing stability, and this wearable strain sensor demonstrates promising applications in human motion monitoring and information encryption systems. This work develops an effective pathway to design lignin-enabled ultra-stretchable eutectic gels for multifunctional sensors.
低共熔凝胶作为重要的导电聚合物，在可穿戴电子设备中具有广阔的实际应用前景。然而，开发用于多功能柔性传感器的超拉伸且自粘性的低共熔凝胶仍然是一个挑战。在此，通过用可聚合的深共熔溶剂（PDES）处理木质素，然后进行原位聚合，制备了一种具有优异自粘性和高导电性的木质素基超拉伸低共熔凝胶（LEG）。在这种LEG中，木质素大分子被用作重要的介质，通过氢键相互作用在聚丙烯酸（PAA）网络中建立动态交联点。移动的PAA链与动态交联点之间氢键的动态破坏和重建确保了交联网络的高度完整性，从而实现了超拉伸性（约4845%）。此外，木质素丰富的酚基赋予LEG强大的自粘性，这使得LEG能够无缝地粘附到不同的基材上。基于这些特性，LEG被组装成具有高灵敏度、快速响应时间和长期传感稳定性的可穿戴应变传感器，并且这种可穿戴应变传感器在人体运动监测和信息加密系统中展示出了广阔的应用前景。这项工作为设计用于多功能传感器的木质素基超拉伸低共熔凝胶开辟了一条有效途径。
