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Polystyrene-block-poly (methoxy diethylene glycol acrylate)-block-polystyrene triblock copolymers in aqueous solution—a SANS study of the temperature-induced switching behavior

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Abstract

A concentrated solution of a symmetric triblock copolymer with a thermoresponsive poly(methoxy diethylene glycol acrylate) (PMDEGA) middle block and short hydrophobic, fully deuterated polystyrene end blocks is investigated in D2O where it undergoes a lower critical solution temperature-type phase transition at ca. 36 °C. Small-angle neutron scattering (SANS) in a wide temperature range (15–50 °C) is used to characterize the size and inner structure of the micelles as well as the correlation between the micelles and the formation of aggregates by the micelles above the cloud point (CP). A model featuring spherical core-shell micelles, which are correlated by a hard-sphere potential or a sticky hard-sphere potential together with a Guinier form factor describing aggregates formed by the micelles above the CP, fits the SANS curves well in the entire temperature range. The thickness of the thermoresponsive micellar PMDEGA shell as well as the hard-sphere radius increase slightly already below the cloud point. Whereas the thickness of the thermoresponsive micellar shell hardly shrinks when heating through the CP and up to 50 °C, the hard-sphere radius decreases within 3.5 K at the CP. The volume fraction decreases already significantly below the CP, which may be at the origin of the previously observed gel–sol transition far below the CP (Miasnikova et al., Langmuir 28: 4479–4490, 2012). Above the CP, small, and at higher temperatures, large aggregates are formed by the micelles.

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Acknowledgments

We thank A. Meier-Koll, A. Sepe, and Q. Zhong for help during the beam time. This work was supported by Deutsche Forschungsgemeinschaft (DFG) within the priority program SPP1259 “Intelligente Hydrogele” (grants Pa771/4, Mu1487/8, La611/7). Portions of this research were carried out at the KWS-2 instrument operated by JCNS at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Garching, Germany.

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Authors and Affiliations

  1. Physik-Department, Fachgebiet Physik weicher Materie/Lehrstuhl Physik funktioneller Materialien, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany

    Joseph Adelsberger, Peter Müller-Buschbaum & Christine M. Papadakis

  2. Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476, Potsdam-Golm, Germany

    Achille M. Bivigou-Koumba, Anna Miasnikova & André Laschewsky

  3. Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstr. 1, 85748, Garching, Germany

    Peter Busch

  4. Fraunhofer Institut für Angewandte Polymerforschung, Geiselbergstr. 69, 14476, Potsdam-Golm, Germany

    André Laschewsky

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  1. Joseph Adelsberger
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  2. Achille M. Bivigou-Koumba
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  7. Christine M. Papadakis
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Correspondence to Christine M. Papadakis.

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Adelsberger, J., Bivigou-Koumba, A.M., Miasnikova, A. et al. Polystyrene-block-poly (methoxy diethylene glycol acrylate)-block-polystyrene triblock copolymers in aqueous solution—a SANS study of the temperature-induced switching behavior. Colloid Polym Sci 293, 1515–1523 (2015). https://doi.org/10.1007/s00396-015-3535-6

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  • DOI: https://doi.org/10.1007/s00396-015-3535-6

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