面向柔性可穿戴传感器的高韧性双网络离子导电水凝胶  

High-toughness Dual-network Ion-conductive Hydrogel for Flexible Wearable Sensors

作　　者：张姗姗 张强 马兴飞 ZHANG Shan-shan;ZHANG Qiang;MA Xing-fei(School of Mechanical Engineering,Shangqiu Institute of Technology,Shangqiu 476000,China)

机构地区：[1]商丘工学院机械工程学院,商丘476000

出　　处：《高分子通报》2024年第11期1636-1644,共9页Polymer Bulletin

基　　金：河南省高等教育教学改革研究与实践项目(项目号2024SJGLX0586)。

摘　　要：高性能水凝胶具有优异的韧性、导电性和传感功能,被视为制备柔性可穿戴传感器理想的候选者。然而,水凝胶面临着机械性能与电化学性能之间的权衡,限制了其在柔性可穿戴传感器中的广泛应用。为了解决水凝胶机械性能与电化学性能之间难以兼容的矛盾,本文将NaCl引入聚乙烯醇/聚丙酰胺(PVA/PAM)双网络水凝胶中,采用一锅法制备了PVA/PAM/NaCl(PAN)导电水凝胶。NaCl的添加为PAN水凝胶引入了物理缠结,并提供了致密的三维网络结构。PAN水凝胶不仅具有优异的力学性能,包括1.06 MPa的拉伸强度、1550%的拉伸应变和2.79 MPa的压缩强度,同时表现出较高的电导率(2.25 S·m^(-1))。此外,PAN水凝胶应变传感器的灵敏度为1.089,且具有较高的线性相关性(R^(2)=0.988),能够精确可靠地检测人体运动。通过将PAN水凝胶传感器装配在人体的不同位置,能够精准地识别不同肌肉运动产生的信号。High-performance hydrogels,known for their excellent toughness,conductivity,and sensing capabilities,are considered as ideal candidates for flexible wearable sensors.However,hydrogels often face a trade-off between mechanical performance and electrochemical properties,limiting their extensive application in flexible wearable sensors.To address the incompatibility between the mechanical and electrochemical properties of hydrogels,we introduced NaCl into a poly(vinyl alcohol)/polyacrylamide(PVA/PAM)dual-network hydrogel.Using a one-pot synthesis method,we prepared the PVA/PAM/NaCl(PAN)conductive hydrogel.The inclusion of NaCl introduces physical entanglements into the PAN hydrogel,providing a dense three-dimensional network structure.The PAN hydrogel exhibits outstanding mechanical properties,including a tensile strength of 1.06 MPa,an elongation at break of 1550%,and a compressive strength of 2.79 MPa,while also demonstrating high electrical conductivity(2.25 S·m^(-1)).Additionally,the strain sensitivity of the PAN hydrogel sensor is 1.089,with a high linear correlation(R^(2)=0.988),enabling precise and reliable detection of human motion.By attaching PAN hydrogel sensors to various parts of the human body,it is possible to accurately identify signals generated by different muscle movements.

关 键 词：聚乙烯醇 柔性可穿戴 水凝胶 离子导电 

分 类 号：TQ427.26[化学工程] TP212[自动化与计算机技术—检测技术与自动化装置]