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The collapse transition of poly(styrene-b-(N-isopropyl acrylamide)) diblock copolymers in aqueous solution and in thin films

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An Erratum to this article was published on 07 January 2011

Abstract

The thermal behavior of a poly(styrene-b-N-isopropyl acrylamide) diblock copolymer was studied in aqueous solution as well as in thick and in thin films. The polymer was synthesized using reversible addition–fragmentation chain transfer. The critical micelle concentration in aqueous solution was determined using fluorescence correlation spectroscopy. The lower critical solution temperature (LCST) of micellar solutions was detected using microcalorimetry and turbidimetry at 31 °C. Using dynamic light scattering, the collapse of the micelles at the LCST as well as their clustering above was observed. These findings were corroborated with small-angle X-ray scattering. In thick films immersed in water, similar findings were made. In a thin film, however, the LCST is depressed and is found at 26–27 °C.

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Acknowledgment

We would like to thank R. Ivanova, M.-S. Appavou, and W. Doster, Physik Department E13, Technische Universität München; R. Luxenhofer, D. Weinfurtner and M. Hanzlik, Department Chemie, Technische Universität München, J. Rädler, Ludwig-Maximilians-Universität München; S. S. Funari, HASYLAB; and S. Förster, Universität Hamburg, for help with the measurements, data analysis, and fruitful discussions. We thank HASYLAB for providing us with a high-intensity X-ray beam and high-quality instrumentation. A.M.B.K. gratefully acknowledges a personal grant from Deutscher Akademischer Austauschdienst DAAD. Financial support by Deutsche Forschungsgemeinschaft within the priority program SPP 1259 (Pa771/4, Mu1487/8, La611/7) is gratefully acknowledged.

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Correspondence to C. M. Papadakis.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00396-010-2344-1

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Troll, K., Kulkarni, A., Wang, W. et al. The collapse transition of poly(styrene-b-(N-isopropyl acrylamide)) diblock copolymers in aqueous solution and in thin films. Colloid Polym Sci 286, 1079–1092 (2008). https://doi.org/10.1007/s00396-008-1871-5

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