Surface Dynamics of Segregation Layer in Blockcopolymer Films

ORAL

Abstract

We have investigated the surface dynamics of supported block copolymer films of poly(styrene)-b-poly(dimethylsiloxane) (PS-b- PDMS) in the spherical phase, i.e., PDMS cores surrounded by PS shells by x-ray photon correlation spectroscopy (XPCS) in grazing angle geometry. The experiment was performed at the beamline 8ID-I in Advanced Photon Source. We found that the PDMS-rich layer near the surface appears at the temperature higher than the glass transition temperature. We applied the modified theory for bilayer model with surface capillary waves on simple viscoelastic liquid films. The viscosity obtained in this study is compared with that from the rheology measurement for bulk.

*This work was supported by Korea Research Foundation, Korea Science \& Engineering Foundation, and Seoul Research and Business Development Program (10816).

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Authors

  • Sanghoon Song

    • Sogang University, Korea

  • Wonsuk Cha

    • Sogang University, Korea

  • Zhang Jiang

    • Advanced Photon Source, ANL

  • Suresh Narayanan

    • Advanced Photon Source, ANL

  • Adrian Ruehm

    • Max Planck Institute for Metal Research, Germany

  • Sunil K. Sinha

    • Univ. of California, San Diego

  • Hyunjung Kim

    • Sogang University