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Effects of concentration and pH on the thermosensitive behavior of a graft copolymer with polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains

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Abstract

Aqueous solutions of the graft copolymer with a polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains with a molecular mass of M = 4.7 × 105 and a grafting density of side chains of 0.44 are investigated by light scattering and turbidimetry. Solutions are studied in a wide concentration range of 0.0008–0.0250 g/cm3 at рН values varying from 2 to 12 for each concentration. The temperature dependences of optical transmission, scattered light intensity, and hydrodynamic radii of scattering objects are obtained. It is shown that the copolymer is thermosensitive only at pH > 8.0. A decrease in acidity of the medium at a fixed concentration of the copolymer is accompanied by a decline in temperatures corresponding to the onset and end of phase separation Т 1 and Т 2, leading to the narrowing of this interval. At constant рН values, temperatures Т 1 and Т 2 rise with solution dilution, while the phase transition interval becomes wider.

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Authors and Affiliations

  1. Institute of Macromolecular Compounds, Russian Academy of Sciences, Bol’shoi pr. 31, St. Petersburg, 199004, Russia

    A. S. Ivanova, N. V. Zakharova, A. P. Filippov, T. K. Meleshko & A. V. Yakimansky

Authors
  1. A. S. Ivanova
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  2. N. V. Zakharova
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  3. A. P. Filippov
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  4. T. K. Meleshko
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  5. A. V. Yakimansky
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Corresponding author

Correspondence to A. P. Filippov.

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Original Russian Text © A.S. Ivanova, N.V. Zakharova, A.P. Filippov, T.K. Meleshko, A.V. Yakimansky, 2017, published in Vysokomolekulyarnye Soedineniya, Seriya A, 2017, Vol. 59, No. 3, pp. 207–214.

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Ivanova, A.S., Zakharova, N.V., Filippov, A.P. et al. Effects of concentration and pH on the thermosensitive behavior of a graft copolymer with polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains. Polym. Sci. Ser. A 59, 281–287 (2017). https://doi.org/10.1134/S0965545X17030087

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  • DOI: https://doi.org/10.1134/S0965545X17030087

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