FEATURES OF ELECTROCHEMICAL AND CONFORMATIONAL BEHAVIOR OF HYDROGELS POLYACRYLIC AND POLYMETHACRYLIC ACIDS, POLY-4-VINYLPYRIDINE AND POLY-2-METHYL-5-VINYLPYRIDINE IN AQUEOUS MEDIUM AND LANTHANUM NITRATE SOLUTION

Abstract

Electrochemical and volume-gravimetric behavior of rare-crosslinked polymer hydrogels of polyacrylic acid (hPAA), polymethacrylic acid (hPMAA), poly-4vinylpyridine (hP4VP) and poly-2-methyl-5-vinylpyridine (hP2M5VP) were studied by methods of conductometry and pH-metry. It is found that in aqueous medium specific electric conductivity increases, pH decreases for polyacids and for polybases, swelling degree increases. The most significant changes occur during 6 hours, further increase is not so intense, what indicates that system reaches equilibrium state. In lanthanum nitrate solution electric conductivity, pH also decreases and swelling degree of hydrogels decreasesas a result of sorption lanthanum ions by polyacids and polybases.

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