Effective Viscosity of Polymer Films on a Strongly Slipping Surface

ORAL

Abstract

We have studied the thickness (h0) dependence of effective viscosity (ηeff) of entangled polystyrene (PS) supported by a polydimethylsiloxane (PDMS) layer grafted on silica -- a representative of polymer film systems exhibiting strong slippage. Our result shows that ηeff was independence of the polymer molecular weight, consistent with plug flow. However, a ~h02 scaling was found instead of the ~h0 dependence expected. A theoretical model based on flow dynamics dominated by low-density elastic pinning sites and strong slippage is described that explains the observation.

*We thank the Research Grant Council of Hong Kong for support (Project no. 16302917).

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Presenters

  • Ophelia Tsui

    • Department of Physics, Hong Kong University of Science and Technology

Authors

  • Xuanji Yu

    • Department of Physics, Division of Materials Science and Engineering, Boston University
    • Department of Physics, Division of Materials and Science Engineering, Boston University

  • Fei Chen

    • Department of Physics, Boston University

  • Chi-Hang Lam

    • Department of Applied Physics, Hong Kong Polytechnic University

  • Ophelia Tsui

    • Department of Physics, Hong Kong University of Science and Technology