摘要
针对传统应变传感器延展性能差、应变范围窄、与人体组织界面应力不匹配等问题,以羧甲基纤维素钠(CMC-Na)和透明质酸(HA)为凝胶骨架,以硼砂(borax)为交联剂,通过一锅法制备了可拉伸的黏附性导电水凝胶CBH,并评价了其机械性能、自愈合性能、黏附性能及应变传感性能。结果表明,在氢键和硼酸酯共价键柔性网络、CMC-Na和HA分子链刚性网络的协同作用下,CBH水凝胶呈现出良好的拉伸性(断裂伸长率1230%)、韧性、抗疲劳性和自愈合能力;由于CMC-Na和HA分子链上的羟基和羧基能与基底表面形成氢键、配位键等化学键,使得CBH水凝胶对木头、猪皮、橡胶、玻璃、塑料、金属、纸张、陶瓷等材料表面具有较强的黏附性能;在电场作用下自由离子在凝胶网络中自由迁移使得CBH水凝胶具有良好的导电性,且对应变具有较高的传感灵敏度和稳定性,将CBH水凝胶组装成柔性应变传感器后可以直接贴附于人体不同部位实现对人体大幅度的关节运动和细微的生理活动的实时监测。
In order to solve the problems of poor ductibility,narrow strain range,and mismatching interfacial stress with human tissue of traditional strain sensors,we prepared a stretchable adhesive conductive hydrogel CBH by using sodium carboxymethylcellulose(CMC-Na)and hyaluronic acid(HA)as gel skeletons and borax as a crosslinking agent via one-pot method.Moreover,we evaluated the mechanical property,self-healing property,adhesion property,and strain sensing property.The results show that CBH hydrogel shows good tensile property(elongation at break of 1230%),toughness,fatigue resistance,and self-healing ability under the synergistic effect of hydrogen bond and borate covalent bond flexible network and CMC-Na and HA molecular chain rigid network.Because the hydroxyl and carboxyl groups on the molecular chains of CMC-Na and HA can form hydrogen bonds and coordination bonds with the substrate surface,CBH hydrogel has strong adhesion properties to the surface of wood,pigskin,rubber,glass,plastic,metal,paper,and ceramics.Under the action of electric field,free ions migrate freely in the gel network,making that CBH hydrogel has good conductivity,and high sensing sensitivity and high stability to strain.The flexible strain sensor assembled by CBH hydrogel can be directly attached to different parts of the human body to realize real-time monitoring of large-scale motions and subtle physiological motions.
作者
赵榕榕
赵军杰
宋沙沙
ZHAO Rongrong;ZHAO Junjie;SONG Shasha(School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255000,China;Zhoucun Ecological Environment Technical Service Center,Zibo 255300,China)
出处
《化学与生物工程》
CAS
北大核心
2024年第8期25-31,共7页
Chemistry & Bioengineering
基金
国家自然科学基金项目(22172092),山东省自然科学基金项目(ZR2021MB079)。
