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Temperature-responsive star-shaped poly(2-ethyl-2-oxazoline) and poly(2-isopropyl-2-oxazoline) with central thiacalix[4]arene fragments: structure and properties in solutions

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Abstract

Temperature-responsive star-shaped poly(2-ethyl-2-oxazoline) (star-PETOX) and poly(2-isopropyl-2-oxazoline) (star-PIPOX) with arms grafted to the lower rim of thiacalix[4]arene were studied in solutions by viscometry, sedimentation velocity, light scattering, and small-angle neutron scattering. The experiments were carried out in water and tetrahydrofuran solutions. It was revealed that in tetrahydrofuran, the studied polymers were present only as individual molecules, while in aqueous solutions, in addition to individual molecules, large polymer aggregates were found. Molecular characteristics of the star-PETOX and star-PIPOX samples were estimated; their behavior in tetrahydrofuran and water was studied over a wide temperature range. It was established that a cloud point of the aqueous solution of star-PETOX (67 °C) is higher than that of a solution of star-PIPOX (35 °C). Comparison of the data obtained by dynamic light scattering and small-angle neutron scattering turned out to be fruitful in revealing all the structural levels of the organization of star-PETOX and star-PIPOX in aqueous solutions. They include the level of the individual macromolecules and the level of supramolecular organization with a star-like architecture.

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Acknowledgements

G.P. Kopitsa is grateful to the Department of Physics and Reactor Engineering of the St. Petersburg Institute of Nuclear Physics of the Scientific and Technical Center “Kurchatov Institute” for providing heavy water.

Funding

A.A. Lezov, A.S. Gubarev, A.N. Podsevalnikova, A.S. Senchukova, E.V. Lebedeva, N.V. Tsvetkov are grateful for the support by a grant from the Russian Science Foundation (project no. 16-13-10148) for study of molecular properties of star-PETOX and star-PIPOX in aqueous and THF solutions. Yu.E. Gorshkova is grateful for JINR-Romania grant No. 321, item 15 from 21.05.2018 for AFM study.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab., 7/9, St. Petersburg, 199034, Russian Federation

    A. A. Lezov, A. S. Gubarev, A. N. Podsevalnikova, A. S. Senchukova, E. V. Lebedeva & N. V. Tsvetkov

  2. Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr 31, St. Petersburg, 199004, Russian Federation

    M. M. Dudkina, A. V. Tenkovtsev, T. N. Nekrasova, L. N. Andreeva & R. Yu. Smyslov

  3. B.P. Konstantinov Petersburg Nuclear Physics Institute NRC KI, Orlova roscha mcr. 1, Gatchina, Leningrad region, 188300, Russian Federation

    R. Yu. Smyslov & G. P. Kopitsa

  4. Joint Institute for Nuclear Research, Joliot-Curie 6, Dubna, Moscow region, 141980, Russia

    Yu. E. Gorshkova

  5. I.V. Grebenshchikov Institute of Silicate Chemistry of RAS, nab. Makarova 2, St. Petersburg, 199034, Russia

    G. P. Kopitsa

  6. Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science@MLZ, Lichtenbergstrasse 1, 85747, Garching, Germany

    A. Rǎdulescu & V. Pipich

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  1. A. A. Lezov
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Lezov, A.A., Gubarev, A.S., Podsevalnikova, A.N. et al. Temperature-responsive star-shaped poly(2-ethyl-2-oxazoline) and poly(2-isopropyl-2-oxazoline) with central thiacalix[4]arene fragments: structure and properties in solutions. Colloid Polym Sci 297, 285–296 (2019). https://doi.org/10.1007/s00396-018-4458-9

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