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Molecular dynamics of hyperbranched polyesters in the confinement of thin films

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Abstract.

Broadband Dielectric Spectroscopy is employed to investigate the molecular dynamics in thin films of hyperbranched polyesters (type AB1B2, with -OH and -OCOCH3 as terminal groups). Three relaxation processes are detected: alpha, beta and gamma. While the latter two are not influenced by the confinement, a pronounced effect is observed on the alpha relaxation: with decreasing film thickness the slower relaxation modes of the dynamic glass transition are gradually suppressed, resulting in an increase of the average relaxation rate and in a linear decrease of the dielectric strength. This is attributed to an immobilization in confinement of the polymeric segments located at the periphery of the hyperbranched macromolecular structures.

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Authors and Affiliations

  1. Institute for Experimental Physics I, Leipzig University, Leipzig, Germany

    A. Serghei & F. Kremer

  2. Leibniz Institute of Polymer Research, Dresden, Germany

    Y. Mikhailova, K. -J. Eichhorn & B. Voit

  3. Institute for Physics, Rostock University, Rostock, Germany

    H. Huth & C. Schick

Authors
  1. A. Serghei
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  2. Y. Mikhailova
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  3. H. Huth
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  4. C. Schick
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  5. K. -J. Eichhorn
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  6. B. Voit
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  7. F. Kremer
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Correspondence to A. Serghei.

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Serghei, A., Mikhailova, Y., Huth, H. et al. Molecular dynamics of hyperbranched polyesters in the confinement of thin films. Eur. Phys. J. E 17, 199–202 (2005). https://doi.org/10.1140/epje/i2005-10009-7

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  • DOI: https://doi.org/10.1140/epje/i2005-10009-7

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