Acrylic Acid/Acrylamide/Carbon Nanotubes Based Hydrogel and the Sensing Performance
LYU Ying1, HU Yongqin1,2, HOU Chen1,2, ZHANG Chao3, LIU Yufei1,2
1 Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, Chongqing 400044, China 2 Centre for Intelligent Sensing Technology, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China 3 Beijing Satellite Environmental Engineering Research Institute, Beijing 100094
Abstract: With binary glycerol/water as dispersion medium, acrylic acid/acrylamide as monomer, ammonium persulfate as initiator, and N,N′-methylenebisacrylamide as crosslinking agent, poly (acrylic acid/acrylamide/carbon nanotubes (AA/AM/CNTs) doped hydrogel were successfully fabricated with using the infrared irradiation radical polymerization method, and then studied by using the universal testing machine and electronic source-meter for characterization and performance testing. The results have shown that the introduction of glycerol makes the gel have great moisture properties, which can be maintained at -20—60 ℃ for more than 7 d. The anti-compression ability of the hydrogel has been improved via adding CNTs. In addition, the gel pressure sensors, showing good stability and repeatability, can be applied to human activities monitoring, such as knee bends, elbow movement, wrist and finger movement, the current changes of the gel pressure sensors reflect the human body movement. It is indicated that the CNTs doping hydrogel has a great application potential of joint disease diagnosis.
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