化工进展 ›› 2022, Vol. 41 ›› Issue (8): 4406-4416.doi: 10.16085/j.issn.1000-6613.2021-2052

• 材料科学与技术 • 上一篇    下一篇

双重动态共价键交联纳米纤维素导电水凝胶及其柔性传感器

邱艺娟1(), 林佳伟1, 秦济锐1, 吴嘉茵1, 林凤采2, 卢贝丽1, 唐丽荣3, 黄彪1()   

  1. 1.福建农林大学材料工程学院,福建 福州 350108
    2.闽江学院材料与化学工程学院,福建 福州 350108
    3.福建农林大学金山学院,福建 福州 350108
  • 收稿日期:2021-09-30 修回日期:2021-11-19 出版日期:2022-08-25 发布日期:2022-08-22
  • 通讯作者: 黄彪 E-mail:1721987739@qq.com;bhuang@fafu.cn
  • 作者简介:邱艺娟(1996—),女,硕士研究生,研究方向纳米纤维素复合材料。E-mail:1721987739@qq.com
  • 基金资助:
    国家自然科学基金(32171726);福建省自然科学基金(2019J01388);国家自然科学基金青年项目(32001267);福建省高等学校“竹资源创新利用”科技创新团队项目(KJG200031A)

Double dynamic covalent bond crosslinked nano-cellulose conductive hydrogel for a flexible sensor

QIU Yijuan1(), LIN Jiawei1, QIN Jirui1, WU Jiayin1, LIN Fengcai2, LU Beili1, TANG Lirong3, HUANG Biao1()   

  1. 1.College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, Fujian, China
    2.College of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, Fujian, China
    3.Jinshan College, Fujian Agriculture and Forestry University, Fuzhou 350108, Fujian, China
  • Received:2021-09-30 Revised:2021-11-19 Online:2022-08-25 Published:2022-08-22
  • Contact: HUANG Biao E-mail:1721987739@qq.com;bhuang@fafu.cn

摘要:

自愈合导电水凝胶因其良好的自愈合性能与导电性能,在柔性可穿戴设备中具有巨大的应用前景。以4-甲酰基苯硼酸(Bn)交联聚乙烯醇(PVA)和聚乙烯亚胺(PEI)构建基于硼酸酯键和亚胺键的双重动态交联水凝胶网络,引入聚吡咯修饰的纤维素纳米纤维(PPy@CNF)构建了具有良好自愈合和导电性的PBP-PPy@CNF纳米复合水凝胶。结果表明,当PPy@CNF的质量分数为0.8%时,水凝胶的力学性能最佳,其最大应力可达6.65kPa,断裂拉伸应变可达2080%,电导率为2174μS/m。基于该水凝胶的电阻式传感器具有良好的稳定性和重复性,在应变检测范围0~800%内,灵敏因子GF可分为三个线性响应区域,分别是0~200%(GF1=2.82)、200%~600%(GF2=7.15)和600%~800%(GF3=12.85),该传感器能有效检测人体不同部位的运动,可应用于可穿戴传感设备。

关键词: 纳米纤维素, 动态共价键, 自愈合, 水凝胶, 传感器

Abstract:

Self-healing conductive hydrogels have great potential applications in flexible wearable devices because of their good self-healing properties and electrical conductivity. A double dynamic cross-linked hydrogel network based on borate ester bond and imine bond was synthesized via cross-linking polyvinyl alcohol (PVA) and polyethylenimine (PEI) with 4-formylbenzoboric acid (Bn). Then, PPy@CNF (grafted polypyrrole (PPy) on the surface of CNF) was incorporated to construct PBP-PPy@CNF nanocomposite hydrogels with good self-healing and electrical conductivity. The results indicated that when the content of PPy@CNF was 0.8wt%, the mechanical properties of the hydrogel were the best. The maximum stress and the fracture tensile strain can be up to 6.65kPa and 2080%, respectively with electrical conductivity of 2174μS/m. In the strain range of 0—800%,the gauge factor GF can be divided into three linear response regions,namely 0—200% (GF1=2.82), 200%—600% (GF2=7.15) and 600%—800% (GF3=12.85). The strain sensors integrated by PBP-PPy@CNF hydrogel with good stability and repeatability can efficiently identify and monitor the various human motions,showing promising applications in the field of wearable sensing devices. This study provided a new way for the design of conductive hydrogel and broadens the application of nanocellulose in sensor field.

Key words: nanocellulose, dynamic covalent bond, self-healing, hydrogel, sensor

中图分类号: 

  • TQ325.9