A transparent hydrated gel is prepared from a poly(vinyl alcohol)(PVA) solution in a mixed solvent consisting of water and dimethyl sulfoxide(DMSO). Upon cooling the PVA solution below the room temperature, a gel is formed as a consequence of crystallization of PVA molecules. Exchange of DMSO in the formed gel with water gives the hydrated PVA gel which is high in tensile strength, water content, and light transmittance.
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Hyon, S.-., Cha, W.-. & Ikada, Y. Preparation of transparent poly(vinyl alcohol) hydrogel. Polymer Bulletin 22, 119–122 (1989). https://doi.org/10.1007/BF00255200