Development of Nanodomain and Fractal Morphologies in Solvent Annealed Block Copolymer Thin Films

Authors

  • Juan Peng,

    1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
    Search for more papers by this author
  • Yanchun Han,

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, P. R. China
    • State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, P. R. China. Fax: +86-431-5262126
    Search for more papers by this author
  • Wolfgang Knoll,

    1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
    Search for more papers by this author
  • Dong Ha Kim

    Corresponding author
    1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
    2. Division of Nano Sciences and Department of Chemistry, Ewha Womans University, 11−1 Daehyun-Dong, Seodaemun-Gu, Seoul 120–750, Korea
    • Division of Nano Sciences and Department of Chemistry, Ewha Womans University, 11−1 Daehyun-Dong, Seodaemun-Gu, Seoul 120–750, Korea. Fax: +82-2-3277-3419
    Search for more papers by this author

Abstract

We have systematically studied the thin film morphologies of asymmetric polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer subjected to solvent vapors of varying selectivity for the constituent blocks. Upon a short treatment in neutral or PS-selective vapor, the film exhibited a highly ordered array of hexagonally packed, cylindrical microdomains. In the case of PEO selective vapor annealing, such ordered cylindrical microdomains were not obtained. Instead, fractal patterns on the microscale were observed and their growth processes investigated. Furthermore, hierarchical structures could be obtained if the fractal pattern was exposed to neutral or PS selective vapor.

original image

Ancillary