On the Question of the Method for Determining the Critical pH Value during the Formation of Complexes between Nonionic Polymers and Polyacid in Aqueous Solutions

Ermukhambetova, Bayana B.; Сулейменов, И. Э.; Alikulov, Adilet; Moldakhan, Inabat; Baipakbaeva, S. T.; Mun, Grigoriy A.

doi:10.1134/s0965545x20060024

Cited by 6 publications

(23 citation statements)

References 10 publications

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“…It can be seen that, in contrast to the results obtained in the cited works [ 46 , 53 ], the phase portraits obtained differ significantly from the parabolic ones. All the phase portraits obtained break up into two rectilinear sections, i.e., the range of pH change breaks up into at least two subranges corresponding to the different natures of the dependence of optical density on the acidity of the medium.…”

Section: Discussioncontrasting

confidence: 91%

“…The curves presented in Figure 1 and Figure 2 do not meet this criterion. As the temperature increases, they do not reach a plateau, as is characteristic of the curves studied in the cited works [ 46 , 53 ].…”

Section: Discussionmentioning

confidence: 78%

“…We emphasize that the phase portrait method has been proposed in our works and is still mainly used by our research group [ 46 , 53 ]. In this and our previous work, it is shown that our proposed method allows us to obtain non-trivial information about the nature of phase transitions.…”

Section: Discussionmentioning

confidence: 99%

“…In fact, Formula (2) means that the temperature dependence of the optical density can be decomposed into two factors. The first of them is linear, and the second one describes a transient process of the same type as the one studied in [ 46 , 53 ].…”

Section: Discussionmentioning

confidence: 99%

“…These curves are also plotted according to the methodology used in [ 46 , 53 ]. Specifically, these figures show the dependence of the derivative

taken with the opposite sign from

, obtained on the basis of experimental data.…”

Section: Discussionmentioning

confidence: 99%

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Effect of the Formation of Hydrophilic and Hydrophobic–Hydrophilic Associates on the Behavior of Copolymers of N-Vinylpyrrolidone with Methyl Acrylate in Aqueous Solutions

Shaikhutdinov,

Mun,

Kopishev

et al. 2024

Polymers

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It has been shown that there exist conditions under which thermosensitive copolymers of N-vinylpyrrolidone with methyl acrylate form hydrophobic–hydrophilic associations, which are unstable dynamic meshes, the bonds in which are continuously broken and created again, and the nature of the formation of such meshes depends significantly on the proportion of the hydrophobic component in the copolymer. It is shown that the interaction of the above copolymers with polyacrylic acid results in the formation of not only classical interpolymer complexes, but also hydrophilic interpolymer associates, which also represent unstable networks existing in a dynamic mode. In such meshes, the molecules of the above copolymers serve as a kind of cross-agent connecting the polyacid molecules. There are also conditions under which such meshes acquire a complex structure, since unstable bonds between macromolecular tangles of both the same and different types take part in their formation. It is shown that the transition from the formation of interpolymer complexes to the formation of hydrophilic interpolymer associates can occur, among other things, due to changes in the acidity or concentration of low-molecular salt in solution.

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Section: Discussioncontrasting

confidence: 91%

Section: Discussionmentioning

confidence: 78%