FEATURES OF SORPTION CALCIUM IONS BY INTERGEL HYDROGELS OF POLYMETHACRYLIC ACID - POLY-4-VINYLPYRIDINE AND POLYACRYLIC ACID –POLY-2-METHYL-5-VINYLPYRIDINE

Abstract

Process of sorptioncalcium ions by intergelhydrogelsystems of polymethacrylic acid – poly-4-vinylpyridine and polyacrylic acid –poly-2-methyl-5-vinylpyridine were studied by methods of conductometry, pH-metry, ion-metry. Calcium sorption process with individual rare-crosslinked hydrogels of PAA, PMAA, P4VP, P2M5VP and intergel systems hPMAA-hP4VP, hPAA-hP2M5VP were accompanied by significant changes of initial electrochemical properties of calcium chloride solution (specific electric conductivity and pH decreases with time of sorption of the metal ions). Individual hydrogels of PAA, PMAA, P4VP, P2M5VP relatively fast reach electrochemical equilibrium in salt solution, consequent slight increase after 24 hours is evidence of this phenomenon, sorption degree after 2 days of sorption of the metal ions reaches 70%. Formation optimal conformation of the polymers occurs in the intergel systems at ratios hPMAA:hP4VP=4:2 and hPAA:hP2M5VP=2:4, however, ionization process of macromolecules are complicated due to the fact, that structures of hPMAA and hP2M5VP have bulk methyl substituent, which interfere undfolding of polymer globe in process of its ionization. Sorption degree of calcium ions by the intergel systems hPMAA:hP4VP=4:2 and hPAA:hP2M5VP=2:4 is 93% and 92% respectively.

References

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