以碱木质素(AL)和纤维素纳米晶体(CNC)为原料,低共熔溶剂(DES)为溶剂,制备了多功能共晶凝胶(DES-AL-CNC).利用FTIR、SEM、EDS对DES-AL-CNC共晶凝胶的结构、机械性能、自恢复性能、黏附性能、抗干燥性和导电性能、抗紫外和透光性能、应变传感性能进行了测试.结果表明,共晶凝胶的断裂应变达852%,拉伸强度达542 kPa,具有良好的黏附性能(对玻璃的黏附强度高达32 kPa)、抗紫外性能和抗干燥性能(65℃存放 7 d 后失重率<10%).此外,共晶凝胶表现出高应变灵敏度(GF=1.74)、快速响应时间(500 ms)和恢复时间(500 ms),其可组装成柔性应变传感器用于实时监测人体的各项生理活动,同时作为生物电极可连续稳定地传输心电和肌电信号,拓宽了柔性可穿戴电子设备的应用.
Preparation and sensing applications of lignin-based multifunctional eutectogel
A multifunctional eutectogel(DES-AL-CNC)was prepared from alkali lignin(AL)and cellulose nanocrystals(CNC)in deep eutectic solvent(DES),characterized by FTIR,SEM and EDS,and analyzed for its mechanical properties,self-healing properties,adhesion properties,dryness resistance,conductivity,UV resistance and light transmission properties,strain sensing properties.The results showed that the eutectogel displayed a strain at break of 852%,a tensile strength of 542 kPa,good adhesion properties(up to 32 kPa to glass),UV resistance,and drying resistance(mass loss rate<10%after 7 d storage at 65℃).In addition,the eutectogel exhibited high strain sensitivity(GF=1.74),fast response time(500 ms)and recovery time(500 ms),which could be assembled into flexible strain sensors for real-time monitoring of various physiological activities in the human body,at the same time,it could be used as a bioelectrode to continuously and stably transmit cardiac and electromyographic signals,thus broadening the applications of flexible wearable electronic devices.
deep eutectic solventslignineutectogelsmultifunctionsensorsfunctional materials
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