Zhang Wanjing, Wen Jingyun, Yang Jiyou, Li Mingfei, Peng Feng, Ma Mingguo, Bian Jing
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
Int J Biol Macromol. 2022 Dec 31;223(Pt A):1-10. doi: 10.1016/j.ijbiomac.2022.10.262. Epub 2022 Nov 3.
Polymers with high conductivity and cross-linking ability are ideal materials for the preparation of conductive hydrogels for application in wearable electronic devices. However, the fabrication of conductive polymer-incorporated hydrogels with good synergistic properties remains a great challenge due to the hydrophobicity and opacity of conjugated π conductive polymers. In this study, a multifunctional hybrid hydrogel was prepared by incorporating hemicellulose-decorated polypyrrole (H/PPY), polyvinyl alcohol (PVA), and tannic acid (TA) into a polyacrylamide (PAM) network. The addition of excess ammonium persulfate (APS) in the process of gelation not only initiated the polymerization of PAM but also resulted in the change of the hydrogel from opaque to transparent by continuously breaking and reducing the size of the PPY particles. The hybrid hydrogel exhibited high transparency and conductivity, good adhesion ability and mechanical performance, and high resistance strain sensitivity and could accurately monitor the strain signals of the index finger and elbow flexion and pulse beat during rest and exercise, which has promising potential for use in wearable or implantable smart sensor devices, electronic skins, and artificial intelligence applications.
具有高导电性和交联能力的聚合物是制备用于可穿戴电子设备的导电水凝胶的理想材料。然而，由于共轭π导电聚合物的疏水性和不透明性，制备具有良好协同性能的导电聚合物复合水凝胶仍然是一个巨大的挑战。在本研究中，通过将半纤维素修饰的聚吡咯（H/PPY）、聚乙烯醇（PVA）和单宁酸（TA）掺入聚丙烯酰胺（PAM）网络中制备了一种多功能混合水凝胶。在凝胶化过程中加入过量的过硫酸铵（APS），不仅引发了PAM的聚合，还通过不断破碎和减小PPY颗粒的尺寸，使水凝胶由不透明变为透明。该混合水凝胶具有高透明度和导电性、良好的粘附能力和机械性能以及高电阻应变敏感性，能够准确监测食指和肘部屈伸以及休息和运动时的脉搏跳动的应变信号，在可穿戴或植入式智能传感器设备、电子皮肤和人工智能应用中具有广阔的应用前景。
