Complex Formation of Divalent Cations with Carboxylic Acid Resins as a Factor Determining Different Stationary States of Their Swelling

Karpyuk, E.A.; Titova, O.I.; Pastukhov, A.V.; Davankov, V.A.; Kargov, S.I.; Ivanov, V.A.

Авторы: Karpyuk Ekaterina A., Titova Oksana I., Pastukhov Alexander V., Davankov Vadim A., Kargov Sergei I., Ivanov Vladimir A.
Журнал: Solvent Extraction and Ion Exchange
Том: 34
Номер: 4
Год издания: 2016
Издательство: Taylor & Francis
Местоположение издательства: United Kingdom
Первая страница: 362
Последняя страница: 374
DOI: 10.1080/07366299.2016.1155898
Аннотация: Three samples of carboxylic acid gel-type cross-linked polyelectrolytes were examined by registering the extent and kinetics of their volume change depending on the temperature, concentration, and nature of external electro- lyte solutions, as well as the initial state (ionic form, water content) of the bead. It is found that in some systems the swelling of the bead (as a result of lowering the temperature) proceeds much more slowly than the preceding shrinking (as a result of the increase of temperature). Moreover, the initial volume of the bead is not restored, and a new stationary state of swelling is established. By means of optical dilatometry, it is found that in the systems in which the differences in the stationary states of swelling are found, the beads display plasto-elastic properties, whereas in the absence of such differences the beads show elastic properties. It is found that different stationary states of swelling are also established when the beads of copolymer of methacrylic acid cross- linked with divinylbenzene in Na+form in the dry state and in the NaCl solution-swollen state are placed into a solution of a divalent cation salt. The difference in the stationary states of swelling reaches 12% in 4 N NiCl2 solution. The substantial differences in the swelling behavior and viscoelastic properties of the resins in their Na+,Mg2+,Ca2+,and Ni2+ forms are interpreted in terms of formation of different kinds of complexes of functional groups of the polymer with Ca2+ and Ni2+ ions.
Добавил в систему: Иванов Владимир Александрович

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