The state of water in finely disperse hydrogels based on acrylamide and acrylic acid |
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| Authors: | Yu M Samchenko I D Atamanenko T P Poltoratskaya Z R Ul’berg |
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| Institution: | (1) Ovcharenko Institute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, bulv. Akademika Vernadskogo 42, Kiev, 03142, Ukraine;(2) Dumanskii Institute of Colloid Chemistry, National Academy of Sciences of Ukraine, bulv. Akademika Vernadskogo 42, Kiev, 01342, Ukraine |
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| Abstract: | The sorption capacity (upon water sorption from the bulk and vapor phases) of copolymeric hydrogels based on acrylamide and acrylic acid and the state of water in the hydrogels are studied. It is established that, for hydrogels prepared in the form of fine powders, pore sizes vary from 90 to 770 Å and the pore radius of hydrogels obtained as monolithic plates ranges from 27 to 200 Å. The acrylamide-to-acrylic acid unit ratio in the hydrogels is found to affect both the amount and the state of sorbed water. It is shown that the properties of water sorbed by hydrogels are governed by carboxyl group concentration rather than by the density of macromolecular chains. |
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