Cellulose nanofiber-carbon nanotube/polyvinyl alcohol-borax hybrid conductive hydrogel
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摘要: 利用纤维素纳米纤丝（Cellulose nanofibers，CNFs）搭载碳纳米管（Carbon nanotubes，CNTs），在水相中将CNF-CNT复合物均匀分散于聚乙烯醇-硼酸盐（PVA-B）基体中，制备具有立体网络结构的CNF-CNT/PVA-B复合导电水凝胶，旨在提高其动态黏弹性、力学强度和导电性能。结果表明： CNF-CNT/PVA-B内部呈现微米级蜂窝状多孔结构，CNFs与CNTs组成的立体网络在显著提高CNF-CNT/PVA-B力学强度和黏弹性的同时还赋予其导电功能。CNTs含量由0增至0.5wt%时，CNF-CNT/PVA-B的抗压强度和弹性模量分别达到24 kPa和53 kPa，最大和高频稳态剪切模量分别达到7 028 Pa和6 945 Pa，电导率达到0.8×10-1 S·cm-1。Abstract: Cellulose nanofibers loaded with carbon nanotubes (CNF-CNT complexes) were well-dispersed in PVA-borax solution to form electrically conductive composite CNF-CNT/PVA-B hydrogel with a three-dimensional network structure, aiming to enhance the viscoelasticity, stiffness and conductivity of hydrogels. The results show that the micro-scale honeycomb cellular structure exists in CNF-CNT/PVA-B hydrogel. The CNF-CNT complexes form network and enhance viscoelasticity, stiffness and conductivity of hydrogels. When the CNT content is 0.5wt% in CNF-CNT/PVA-B hydrogel, the compressive strength and elastic modulus are 24 kPa and 53 kPa, the maximum and high-frequency plateau of shear modulus are 7 028 Pa and 6 945 Pa, and the conductivity is 0.8×10-1 S·cm-1, respectively.
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Keywords:
- nanocellulose /
- hydrogel /
- conductivity /
- rheological properties /
- carbon nanotube
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