Solution behavior of quenched or strongly charged polyampholytes in aqueous-salt solutions

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dc.contributor.author Toleutay, G.
dc.contributor.author Shakhvorostov, A.V.
dc.contributor.author Kabdrakhmanova, S.K.
dc.contributor.author Kudaibergenov, S.E.
dc.date.accessioned 2019-08-23T10:58:32Z
dc.date.available 2019-08-23T10:58:32Z
dc.date.issued 2019-06-28
dc.identifier.citation Toleutay, G. Solution behavior of quenched or strongly charged polyampholytes in aqueous-salt solutions / G. Toleutay, A.V. Shakhvorostov, S.K. Kabdrakhmanova [et al.] // Қарағанды универисетінің хабаршысы. Химия сериясы.=Вестник Карагандинского университета. Серия Химия.=Bulletin of the Karaganda University. Chemistry series. – 2019. – № 2. – P. 35-44. ru_RU
dc.identifier.issn 2518-718X
dc.identifier.issn 2663-4872
dc.identifier.uri http://rep.ksu.kz//handle/data/7299
dc.description.abstract Quenched (or strongly charged) polyampholytes based on fully charged anionic monomer — sodium salt of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and cationic monomer — (3-acrylamidopropyl)-trimethylammonium chloride (APTAC) were synthesized by radical copolymerization and their behavior was studied in aqueous-salt solutions. A series of unbalanced (AMPS-25 and AMPS-75) and balanced (AMPS-50) quenched polyampholytes were characterized by 1H NMR, FTIR, GPC, DLS, viscosity, DSC, TGA. It was established that at the isoelectric point (IEP) the quenched polyampholytes in aqueous solutions are stabilized by cooperative intraionic contacts between strong charged anionic and cationic moieties. The conformational state of AMPS-25 and AMPS-75 in aqueous solution is represented as «core» and «shell» structure. The «core» part behaves polyampholyte character (PA region) while the «shell» part exhibits polyelectrolyte effect (PE region). Increasing of the ionic strength tends to shrink the polyelectrolyte «shell» and to swell the polyampholyte «core». In contrast to AMPS-25 and AMPS-75, the hydrodynamic size of balanced polyampholyte AMPS-50 at the IEP increases upon increasing of the ionic strength demonstrating the antipolyelectrolyte behavior. In aqueous solution the isoelectric points of quenched polyampholytes were found to be pH 6.10.1. In the presence of KCl the positions of the IEP shifted to pH 6.5–7.0 due to specific binding of chloride ions by quaternary ammonium groups of «quenched» polyampholytes. ru_RU
dc.language.iso en ru_RU
dc.publisher Ye.A.Buketov Karaganda State University Publishing house ru_RU
dc.relation.ispartofseries Қарағанды универисетінің хабаршысы. Химия сериясы.=Вестник Карагандинского университета. Серия Химия.=Bulletin of the Karaganda University. Chemistry Series.;№ 2(94)/2019
dc.subject quenched polyampholytes ru_RU
dc.subject isoelectric point ru_RU
dc.subject hydrodynamic size ru_RU
dc.subject intrapolyelectrolyte complexes ru_RU
dc.subject «core-shell» structure ru_RU
dc.subject polyampholyte regime ru_RU
dc.subject polyelectrolyte regime ru_RU
dc.subject ionic strength ru_RU
dc.title Solution behavior of quenched or strongly charged polyampholytes in aqueous-salt solutions ru_RU
dc.title.alternative Quenched, немесе күшті зарядталған, полиамфолиттердің сулы-тұзды ерітіндідегі қасиеті ru_RU
dc.title.alternative Поведение quenched, или сильно заряженных, полиамфолитов в водно-солевых растворах ru_RU
dc.type Article ru_RU


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