Xu Xiuru, He Chubin, Luo Feng, Wang Hao, Peng Zhengchun
Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronic Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China.
School of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Polymers (Basel). 2021 Jun 18;13(12):2004. doi: 10.3390/polym13122004.
Transparent, conductive hydrogels with good mechanical strength and toughness are in great demand of the fields of biomedical and future wearable smart electronics. We reported a carboxymethyl chitosan (CMCS)-calcium chloride (CaCl)/polyacrylamide (PAAm)/poly(N-methylol acrylamide (PNMA) transparent, tough and conductive hydrogel containing a bi-physical crosslinking network through in situ free radical polymerization. It showed excellent light transmittance (>90%), excellent toughness (10.72 MJ/m), good tensile strength (at break, 2.65 MPa), breaking strain (707%), and high elastic modulus (0.30 MPa). The strain sensing performance is found with high sensitivity (maximum gauge factor 9.18, 0.5% detection limit), wide strain response range, fast response and recovery time, nearly zero hysteresis and good repeatability. This study extends the transparent, tough, conductive hydrogels to provide body-surface wearable devices that can accurately and repeatedly monitor the movement of body joints, including the movements of wrists, elbows and knee joints. This study provided a broad development potential for tough, transparent and conductive hydrogels as body-surface intelligent health monitoring systems and implantable soft electronics.
具有良好机械强度和韧性的透明导电水凝胶在生物医学和未来可穿戴智能电子领域有巨大需求。我们通过原位自由基聚合报道了一种含有双物理交联网络的羧甲基壳聚糖（CMCS）-氯化钙（CaCl）/聚丙烯酰胺（PAAm）/聚（N-羟甲基丙烯酰胺）（PNMA）透明、坚韧且导电的水凝胶。它表现出优异的透光率（>90%）、出色的韧性（10.72 MJ/m）、良好的拉伸强度（断裂时为2.65 MPa）、断裂应变（707%）和高弹性模量（0.30 MPa）。发现其应变传感性能具有高灵敏度（最大应变系数9.18，检测限0.5%）、宽应变响应范围、快速响应和恢复时间、几乎零滞后以及良好的重复性。本研究扩展了透明、坚韧、导电水凝胶的应用，以提供能够准确且重复监测身体关节运动（包括手腕、肘部和膝关节运动）的体表可穿戴设备。本研究为坚韧、透明且导电的水凝胶作为体表智能健康监测系统和可植入软电子器件提供了广阔的发展潜力。
