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| Format: | Preprint |
| Published: |
2024
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| Online Access: | https://arxiv.org/abs/2404.07708 |
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| _version_ | 1866913779034357760 |
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| author | Kovalchuk, Valery I. |
| author_facet | Kovalchuk, Valery I. |
| contents | Thermal behaviors of hydroxypropyl cellulose dilute aqueous solutions with impurities of Group~I alkali metal ions (Li, Na, K, Rb and Cs chlorides) has been studied by means of static and dynamic light scattering measurements. From the experimental data, it follows that at temperatures above the LCST and in the presence of salts, there arise supramolecular associates (clusters) that are several times larger than the wavelength of visible light. It is shown that the observed intensity of backscattered light is described by the tangent plane approximation and the Mie scattering theory. An approach is proposed to model the hydrophobic association of polymer molecules in solutions with salt ions. A parameter driving the interfacial energy density at the polymer-solvent interface is introduced into the Cahn-Hilliard equation, which describes the temporal evolution of the polymer concentration in a given point of space. In this way, the presence of electrolytes in solution is modeled. It follows from the results of computer simulation that an increase in the interfacial energy density (strengthening of hydrophobic interactions) leads to an increase in the size of polymer aggregates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07708 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Aggregation in Dilute Aqueous Solutions of Hydroxypropyl Cellulose with Salt Ions Kovalchuk, Valery I. Soft Condensed Matter Thermal behaviors of hydroxypropyl cellulose dilute aqueous solutions with impurities of Group~I alkali metal ions (Li, Na, K, Rb and Cs chlorides) has been studied by means of static and dynamic light scattering measurements. From the experimental data, it follows that at temperatures above the LCST and in the presence of salts, there arise supramolecular associates (clusters) that are several times larger than the wavelength of visible light. It is shown that the observed intensity of backscattered light is described by the tangent plane approximation and the Mie scattering theory. An approach is proposed to model the hydrophobic association of polymer molecules in solutions with salt ions. A parameter driving the interfacial energy density at the polymer-solvent interface is introduced into the Cahn-Hilliard equation, which describes the temporal evolution of the polymer concentration in a given point of space. In this way, the presence of electrolytes in solution is modeled. It follows from the results of computer simulation that an increase in the interfacial energy density (strengthening of hydrophobic interactions) leads to an increase in the size of polymer aggregates. |
| title | Aggregation in Dilute Aqueous Solutions of Hydroxypropyl Cellulose with Salt Ions |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2404.07708 |