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1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures

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Abstract

1H NMR spectroscopy was used to investigate the temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) (PIPMAm/PVCL) mixtures to find out if the phase transition of the given component (PIPMAm or PVCL) is affected by the presence of the second component. Our results that PVCL and PIPMAm transitions are in polymer mixtures shifted by ~2 K towards higher temperatures in comparison with neat polymers and depend on polymer concentration show that such effect exists. Spin–spin relaxation times of water (HDO) indicate that in solutions with c ≥ 1 wt% a portion of water is predominantly bound in PVCL mesoglobules even at temperatures above the LCST transition of PIPMAm component. Water is with time released from these mesoglobules without any induction period so indicating that it is mostly indirectly bound water. We assume that there is a direct connection between character of the bound water and the transition temperatures.

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Acknowledgments

This work was supported by the Czech Science Foundation (Project 202/09/1281), Ministry of Education of CR (Project MSM0021620835) and AS CR (Project AVOZ 40500505).

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Authors and Affiliations

  1. Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00, Prague 8, Czech Republic

    Hana Kouřilová & Lenka Hanyková

  2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic

    Jiří Spěváček

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  1. Hana Kouřilová
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  2. Jiří Spěváček
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  3. Lenka Hanyková
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Correspondence to Jiří Spěváček.

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Kouřilová, H., Spěváček, J. & Hanyková, L. 1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures. Polym. Bull. 70, 221–235 (2013). https://doi.org/10.1007/s00289-012-0831-x

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  • DOI: https://doi.org/10.1007/s00289-012-0831-x

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