Hydrogels (crosslinked polymers with a defined water content) based on N ‐vinyl‐2‐pyrrolidinone and 2‐hydroxyethyl methacrylate of different compositions were prepared by radical copolymerization and swollen in buffered isotonic sodium chloride solution. The linear expansion to hydration, weight‐percentage of hydration, refractive index, extractables, percentage of transmission of visible light and oxygen permeability of the resulting hydrogel samples were examined.
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Koßmehl et al. (1989) studied this question.
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