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Materials 2018, 11(9), 1615;

Electroactive Hydrogels Made with Polyvinyl Alcohol/Cellulose Nanocrystals

Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea
Laboratory of Material Sciences, Instituto de Quimica de Recursos Naturales, Universidad de Talca, Talca 747, Chile
Author to whom correspondence should be addressed.
Received: 28 May 2018 / Revised: 31 August 2018 / Accepted: 3 September 2018 / Published: 4 September 2018
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This paper reports a nontoxic, soft and electroactive hydrogel made with polyvinyl alcohol (PVA) and cellulose nanocrystal (CNC). The CNC incorporating PVA-CNC hydrogels were prepared using a freeze–thaw technique with different CNC concentrations. Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy results proved the good miscibility of CNCs with PVA. The optical transparency, water uptake capacity and mechanical properties of the prepared hydrogels were investigated in this study. The CNC incorporating PVA-CNC hydrogels showed improved displacement output in the presence of an electric field and the displacement increased with an increase in the CNC concentration. The possible actuation mechanism was an electrostatic effect and the displacement improvement of the hydrogel associated with its enhanced dielectric properties and softness. Since the prepared PVA-CNC hydrogel is nontoxic and electroactive, it can be used for biomimetic soft robots, actively reconfigurable lenses and active drug-release applications. View Full-Text
Keywords: electroactive hydrogel; polyvinyl alcohol; cellulose nanocrystals; freeze–thaw method; actuation electroactive hydrogel; polyvinyl alcohol; cellulose nanocrystals; freeze–thaw method; actuation

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Jayaramudu, T.; Ko, H.-U.; Kim, H.C.; Kim, J.W.; Muthoka, R.M.; Kim, J. Electroactive Hydrogels Made with Polyvinyl Alcohol/Cellulose Nanocrystals. Materials 2018, 11, 1615.

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