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Self-organization in aqueous solutions of thermosensitive star-shaped and linear gradient copolymers of 2-ethyl-2-oxazoline and 2-isopropyl-2-oxazoline

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Abstract

Thermosensitive star-shaped eight-arm poly-2-alkyl-2-oxazolines (M = 21,000 g mol−1) was synthesized. The arms were gradient copolymers of 2-ethyl-2-oxazoline (EtOx) and 2-isopropyl-2-oxazoline (iPrOx). The more hydrophilic EtOx units prevailed near the calix[8]arene core. For comparison, model linear gradient copolymer (M = 3800 g mol−1) was investigated. For both polymers, comonomer molar ratio was 1/1. The aqueous solutions of copolymers were studied by light scattering and turbidimetry. Self-organization of linear and star-shaped molecules in solution was different, but the phase separation temperatures for these copolymers coincided. In order to find out the influence of the distribution of EtOx and iPrOx units along the arms on the behavior of star-shaped polyalkyloxazolines, the behavior of investigated stars was compared with that for stars, whose arms was block copolymers poly-2-isopropyl-2-oxazoline and poly-2-ethyl-2-oxazoline. It was shown that the phase separation temperature for gradient copolymer solutions was higher than one for block copolymers.

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  • 15 April 2020

    The author noticed that the published paper contained error. Unfortunately, the author name “Tatyana Kirila” of the article was repeated twice. Given in this paper is the correct list of authors.

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Acknowledgments

Tenkovtsev A.V. thanks the Russian Ministry of Education and Science (No 14.W03.31.0022 Megagrant of the Government of the Russian Federation).

Funding

Financial support was provided by the Russian Foundation for Basic Research (project No 18-33-00153-mol_a).

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Authors and Affiliations

  1. Institute of Macromolecular Compounds of Russian Academy of Sciences, Bolshoy pr., 31, Saint Petersburg, Russia, 199004

    Tatyana Kirila, Anna Smirnova, Mikhail Kurlykin, Andrey Tenkovtsev & Alexander Filippov

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  1. Tatyana Kirila
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  2. Anna Smirnova
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  3. Mikhail Kurlykin
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  4. Andrey Tenkovtsev
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Correspondence to Tatyana Kirila.

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The original version of this article was revised: The author noticed that the published paper contained error. Unfortunately, the author name “Tatyana Kirila” of the article was repeated twice. Given in this paper is the correct list of authors.

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Kirila, T., Smirnova, A., Kurlykin, M. et al. Self-organization in aqueous solutions of thermosensitive star-shaped and linear gradient copolymers of 2-ethyl-2-oxazoline and 2-isopropyl-2-oxazoline. Colloid Polym Sci 298, 535–546 (2020). https://doi.org/10.1007/s00396-020-04638-z

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