Poly(Acrylic Acid)-Poly(Vinyl Alcohol) Hydrogels for Reconfigurable Lens Actuators

다국어 초록 (Multilingual Abstract)

Reconfigurable lens provides variable-focus in optics without any moving part. The material for a reconfigurable lens should be deformable in the presence of external stimuli meanwhile maintaining its optical transparency for the lens function. This article reports the fabrication and actuation property of the Poly(acrylic acid)-Poly(vinyl alcohol) (PAP) hydrogels for reconfigurable active lens. The PAP hydrogels were prepared by free radical and freeze-thaw technique using N,N1-methylenebisacrylamaide and potassium persulfate/N,N,N1,N1-tetramethylethylenediamene as crosslinker-initiator pair system. The formation of the hydrogels was conformed form Fourier transform infrared spectra and thermogravimetric analysis. The prepared hydrogels were characterized by swelling studies and optical transparency measured with UV-visible spectroscopy and actuation test in the presence of electric field. There is an optimal concentration of acrylic acid concentration that shows maximum displacement output with less optical transparency loss. Displacement output increased with increasing the voltage and the maximum displacement output of 15.5 µm was achieved in the presence of electrical field. This corresponds to 4% strain.

참고문헌 (Reference)

1 Lee, Y. M., "Synthesis and Swelling Characteristics of pH and Thermoresponsive Interpenetrating Polymer Network Hydrogel Composed of Poly(Vinyl Alcohol)and Poly(Acrylic Acid)" 62 (62): 301-311, 1996

2 Lee, Y. M., "Synthesis and Swelling Characteristics of pH and Thermoresponsive Interpenetrating Polymer Network Hydrogel Composed of Poly(Vinyl Alcohol)and Poly(Acrylic Acid)" 62 (62): 301-311, 1996

3 Gao, X., "Synthesis and Characterization of Biodegradable pH-Sensitive Poly(Acrylic Acid)Hydrogels Crosslinked by 2-Hydroxyethyl Methacrylate Modified Poly(l-Glutamic Acid)" 77 : 74-77, 2012

4 Elliott, J. E., "Structure and Swelling of Poly(Acrylic Acid)Hydrogels : Effect of pH, Ionic Strength, and Dilution on the Crosslinked Polymer Structure" 45 (45): 1503-1510, 2004

5 Lee, H., "Strategies for Hydrogen Bonding Based Layer-by-Layer Assembly of Poly(Vinyl Alcohol)with Weak Polyacids" 45 (45): 347-355, 2011

6 Gulyuz, U., "Self-Healing Poly(Acrylic Acid)Hydrogels with Shape Memory Behavior of High Mechanical Strength" 47 (47): 6889-6899, 2014

7 Azizi, S. M. A. S., "Review of Recent Research into Cellulosic Whiskers, Their Properties and Their Application in Nanocomposite Field" 6 (6): 612-626, 2005

8 Gudeman, L. F., "Preparation and Characterization of pH-Sensitive, Interpenetrating Networks of Poly(Vinyl Alcohol)and Poly(Acrylic Acid)" 55 (55): 919-928, 1995

9 Mirmohseni, A., "Preparation and Characterization of Processable Electroactive Polyaniline-Polyvinyl Alcohol Composite" 44 (44): 3523-3528, 2003

10 Lu, Y., "Poly(Vinyl Alcohol)/Poly(Acrylic Acid)Hydrogel Coatings for Improving Electrode-Neural Tissue Interface" 30 (30): 4143-4151, 2009

11 Andreopoulos, F. M., "Light-Induced Tailoring of Peg-Hydrogel Properties" 19 (19): 1343-1352, 1998

12 Jayaramudu, T., "Iota-Carrageenan-Based Biodegradable Ag0Nanocomposite Hydrogels for the Inactivation of Bacteria" 95 (95): 188-194, 2013

13 Ahmad, J., "Influence of TiO₂on the Chemical, Mechanical, and Gas Separation Properties of Polyvinyl Alcohol-Titanium Dioxide(PVA-TiO₂)Nanocomposite Membranes" 18 (18): 287-296, 2013

14 김수호, "Geometry Modulation of Microlens Array Using Spin Coating and Evaporation Processes of Photoresist Mixture" 한국정밀공학회 2 (2): 231-235, 2015

15 Naficy, S., "Electrically Conductive, Tough Hydrogels with pH Sensitivity" 24 (24): 3425-3433, 2012

16 Jayaramudu, T., "Development of Novel Biodegradable Au Nanocomposite Hydrogels Based on Wheat : For Inactivation of Bacteria" 92 (92): 2193-2200, 2013

17 신우현, "Computational Simulation of Spirally Coiled Deformation of a Bi-Layered Hydrogel Strip Induced by Swelling" 한국정밀공학회 16 (16): 409-412, 2015

18 Chee Meng Benjamin Ho, "A Review on 3D Printed Bioimplants" 한국정밀공학회 16 (16): 1035-1046, 2015