Formation of Hydrophobic–Hydrophilic Associates in the N-Vinylpyrrolidone and Vinyl Propyl Ether Copolymer Aqueous Solutions
Kabdushev S. Mun G. Suleimenov I. Alikulov A. Shaikhutdinov R. Kopishev E.
September 2023Multidisciplinary Digital Publishing Institute (MDPI)
Polymers
2023#15Issue 17
Utilizing turbidimetry data, an examination is conducted on the behavior of solutions containing N-vinylpyrrolidone and vinyl propyl ether copolymer within a temperature range coinciding with the occurrence of a phase transition. The investigation reveals that within specific conditions prevailing in this domain, the emergence of entities denoted as hydrophobic–hydrophilic associates is conceivable. These entities are characterized by the presence of a relatively dense core, upheld by hydrophobic interplays, and they are proficient in effectively dispersing irradiation within the optical spectrum. Encircling this core is a hydrophilic periphery that impedes the formation of insoluble precipitates. The development of such associates transpires when hydrophobic interactions have attained a discernible prominence, although they remain inadequate to counteract the forces that drive the expansion of macromolecular coils. Under these circumstances, the energetically favored course of action entails the constitution of a core for the aforementioned associates, involving discrete segments from diverse macromolecules. Notably, the introduction of an additional constituent (ethanol) to the solution, which selectively mitigates hydrophobic interactions, serves to stabilize the hydrophobic–hydrophilic associations.
hydrogen bonds , hydrophobic interactions , hydrophobic–hydrophilic associates , macromolecular coils , polymer solutions
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National Engineering Academy of the Republic of Kazakhstan, Almaty, 050010, Kazakhstan
Department of Chemistry & Technology of Organic Materials, Faculty of Chemistry and Chemical Technology, Polymers and Natural Compounds, Al Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Department of Chemistry, Faculty of Natural Sciences, L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
Department of General and Inorganic Chemistry, Faculty of Natural Sciences, Bukhara State University, Bukhara, 705018, Uzbekistan
National Engineering Academy of the Republic of Kazakhstan
Department of Chemistry & Technology of Organic Materials
Department of Chemistry
Department of General and Inorganic Chemistry
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