Construction of Self-healing Conductive Hydrogel Based on Polyvinyl Alcohol/Wool Keratin/Carbon Nanotube
To further improve the mechanical properties and conductive sensitivity of polyvinyl alcohol hydrogel,this paper prepared self-healing conductive hydrogel with interpenetrating double network structure using polyvinyl alcohol(PVA)as the raw material,wool keratin(KE),aluminum chloride(AlCl3)as the crosslinking agent,and carbon nanotubes(CNT)as the conductive carrier.PVA/KE/CNT composite hydrogel was tested and analyzed by scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray diffractometer(XRD)and other test methods.The results show that the coordination complexation between Al3+in AlCl3,—COOH and—OH in keratin promotes the cross-linking between keratins to form clusters,and a tight structure is also formed through the cross-linking between Al3+in AlCl3 and—OH in PVA.These functions enhance the strength and toughness of hydrogel.CNT are tightly wrapped by two cross-linked structures and endow the hydrogel with electrical conductivity.The addition of CNT increases the toughness of the composite hydrogel,and the material strength is significantly increased when the mass fraction of carbon nanotubes is 4%or 5%.The hydrogel prepared has a good self-healing performance,and its self-healing performance is proportional to the healing time.When the self-healing time reaches 12 h,the self-healing effect is the best.The hydrogel resistance decreases with the addition of CNT,andthehydrogelresistanceisrespectively8.98,4.56,3.81 and3.12 kΩ after adding CNT with mass fraction of 2%to5%.This kind of hydrogel with good mechanical property,self-healing property and electrical conductivity has natural flexibility matching with human motion detection applications,and has good application prospects in the field of electronic skin and flexible sensors.
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