PROPERTIES OF WATER-SOLUBLE POLYMERS AND THEIR POLYCOMPLEXES IN AQUEOUS SOLUTIONS

Yessenov Science Journal Pub Date : 2023-12-15 DOI:10.56525/ezad5576

Akkenzhe Bussurmanova

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Abstract

Abstract. The interaction of oppositely charged polyelectrolytes (sodium salt of carboxymethylcellulose (NaCMC), methylcellulose (MC), polyethylenimine (PEI) and polydimethyldiallylammonium chloride (PDMDAAС), and unifloc (UF)) in an aqueous environment was studied using the methods of viscometry, spectrophotometry and macroelectrophoresis. It has been established that the interaction of these polyelectrolytes is accompanied by a significant decrease in reduced viscosity (up to 0.1-0.15 dl/g, which is typical for compacted macromolecules of globular proteins), an increase in optical density and an inversion of the sign of the electrokinetic potential. All this indicates the formation of interpolymer complexes from interacting cationic and anionic polyelectrolytes. Experimental results of studying the properties of water soluble polymers and their polyelectrolyte complexes in aqueous solutions at the water/air interface are described and discussed. It has been shown that complex formation in relatively simple systems is accompanied by changes in the pH of the medium, optical, hydrodynamic, electrochemical and other properties of macromolecules. In the systems we studied, the interaction of the system components is not accompanied by variations in the pH of the medium, therefore, information about the interaction of water-soluble polyelectrolytes in the systems we studied was obtained based on viscometric and spectrophotometric titration data, as well as from changes in the electrokinetic potential of macromolecules. The study of the electrokinetic potential showed that the formation of interpolymer complexes in the systems under consideration is accompanied by significant changes in the electrokinetic potential of macromolecules. A study of the properties of mixtures of aqueous solutions of Na-CMC, MC, UF with polydimethyldiallylammonium chloride and polyethylenimine indicates the formation of interpolyelectrolyte complexes that have a more compact structure than the original macromolecules. Key words: polyelectrolytes; flocculation; cross-linking; stability; interpolymer complexes; optical density; polymer.

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水溶液中水溶性聚合物及其多聚物的特性

摘要利用粘度测定法、分光光度法和宏观电泳法研究了带相反电荷的聚电解质（羧甲基纤维素钠盐（NaCMC）、甲基纤维素（MC）、聚乙烯亚胺（PEI）和聚二甲基二烯丙基氯化铵（PDMDAAС）以及unifloc（UF））在水环境中的相互作用。结果表明，在这些聚电解质相互作用的过程中，粘度会显著降低（降至 0.1-0.15 dl/g，这是球状蛋白质大分子压缩的典型现象），光密度会增加，电动势的符号也会反转。所有这些都表明阳离子和阴离子聚电解质相互作用形成了聚合物间复合物。研究水溶性聚合物及其聚电解质复合物在水/空气界面水溶液中的特性的实验结果进行了描述和讨论。研究表明，在相对简单的体系中，络合物的形成伴随着介质 pH 值、大分子的光学、流体力学、电化学和其他性质的变化。在我们所研究的体系中，体系成分的相互作用并不伴随介质 pH 值的变化，因此，我们所研究的体系中水溶性聚电解质的相互作用信息是根据粘度计和分光光度计滴定数据以及大分子的电动势变化获得的。对电动势的研究表明，在所研究的体系中形成聚合物间复合物的同时，大分子的电动势也发生了显著变化。对 Na-CMC、MC、UF 的水溶液与聚二甲基二烯丙基氯化铵和聚乙烯亚胺的混合物性质的研究表明，形成的互电解质复合物比原来的大分子具有更紧密的结构。关键词：聚电解质；絮凝；交联；稳定性；聚合物间复合物；光密度；聚合物。

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Yessenov Science Journal

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