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Formation of a PVA hydrogel film by swelling-induced gelation around a hydrosoluble PEG substrate: (A) dry un–cross-linked PEG substrate obtained by melt pressing, (B) formation of a PVA hydrogel film during immersion of the substrate in a 10 wt% PVA aqueous solution, and (C) PVA hydrogel film after complete dissolution of the PEG substrate and immersion in water.
