Porous and transparent poly(vinyl alcohol) gel and method of manufacturing the same
AssigneeBiomaterials Universe, Inc.
InventorsSuong-Hyu Hyon, Yoshito Ikada
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Abstract
A porous and transparent hydrated gel is prepared from a poly(vinyl alcohol) solution in a mixed solvent consisting of water and an water-miscible organic solvent. Upon cooling the poly(vinyl alcohol) solution below room temperature, a gel is formed as a consequence of crystallization of poly(vinyl alcohol) molecules. Exchange of the organic solvent included in the gel with water produces a hydrated gel of poly(vinyl alcohol) which has a high tensile strength, a high water content, and a high light transmittance.
Claims6
A method of manufacturing a porous and transparent hydrated gel of poly(vinyl alcohol) comprising the steps:
- (a) forming a solution of poly(vinyl alcohol) having a degree of saponification of not less than 95% by mole, in a mixed solvent from water and an organic solvent,
- (b) cooling the solution below 0.degree. C. for crystallization of poly(vinyl alcohol),
- (c) exchanging the organic solvent included in the gel with water to yield the hydrated gel.
Dependencies are inferred from the claim text.