Thermo- and pH-Sensitive Behavior of Copolymers of N-Vinylcaprolactam with N-Vinylimidazole

O. V. Vyshivannaya; Вышиванная О. В.; E. R. Parkhomenko; Пархоменко Е. Р.; A. I. Barabanova; Барабанова А. И.; A. V. Vorozheykina; Ворожейкина А. В.; N. V. Grinberg; Гринберг Н. В.; T. V. Burova; Бурова Т. В.; V. Ya. Grinberg; Гринберг В. Я.; I. V. Blagodatskikh; Благодатских И. В.

doi:10.31857/S2308112023700505

Thermo- and pH-Sensitive Behavior of Copolymers of N-Vinylcaprolactam with N-Vinylimidazole

Authors: Vyshivannaya O.V.¹, Parkhomenko E.R.², Barabanova A.I.¹, Vorozheykina A.V.¹, Grinberg N.V.¹, Burova T.V.¹, Grinberg V.Y.¹, Blagodatskikh I.V.¹
Affiliations:
1. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences
2. Moscow State University, Department of Physics
Issue: Vol 65, No 3 (2023)
Pages: 163-174
Section: ПОЛИЭЛЕКТРОЛИТЫ
URL: https://journals.rcsi.science/2308-1120/article/view/135315
DOI: https://doi.org/10.31857/S2308112023700505
EDN: https://elibrary.ru/MJWZBP
ID: 135315

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Abstract

Free-radical copolymerization in bulk has afforded copolymers of N-vinylcaprolactam and N‑vinylimidazole (40–60 mol %). Thermosensitive behavior of aqueous solutions of the copolymers has been probed over wide pH range by means of dynamic and static light scattering as well as high-sensitivity differential scanning calorimetry. Three regions of thermally induced conformational behavior have been observed with the change in the medium pH from the alkaline to acidic: phase separation region (I), region of the conformational transition into the mesoglobules state (II), and region of stable molecular solution of the poly-electrolyte (III). Significant polyelectrolyte effects have been revealed for the salt-free solutions of the copolymers, reflected in the presence of fast and slow diffusion modes in the relaxation time distributions. Moderate increase in the ionic strength with the addition of the low-molecular salt has led to shielding of the polyelectrolyte effects, yet the pH-dependent regions of the conformational behavior have not been affected much. The existence of different types of the thermally induced conformational behavior depending on pH has been explained by the balance between hydrophobic interactions involving the N-vinylcaprolactam units and electrostatic interactions of the weakly basic N-vinylimidazole units.

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