Get access

Block Copolymer Permeable Membrane with Visualized High-Density Straight Channels of Poly(ethylene oxide)

Authors

  • Takashi Yamamoto,

    Corresponding author
    1. Division of Integrated Molecular Engineering, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku, Yokohama 226–8503, Japan
    2. (current address), Department of Chemistry, Faculty of Science and Technology, Keio University, 3–14-1 Hiyoshi, Yokohama 223–8522, Japan
    • (current address), Department of Chemistry, Faculty of Science and Technology, Keio University, 3–14-1 Hiyoshi, Yokohama 223–8522, Japan
    Search for more papers by this author
  • Taro Kimura,

    1. Division of Integrated Molecular Engineering, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku, Yokohama 226–8503, Japan
    Search for more papers by this author
  • Motonori Komura,

    1. Division of Integrated Molecular Engineering, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku, Yokohama 226–8503, Japan
    Search for more papers by this author
  • Yukimitsu Suzuki,

    Corresponding author
    1. Division of Integrated Molecular Engineering, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku, Yokohama 226–8503, Japan
    2. (current address), Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113–0033, Japan
    • (current address), Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113–0033, Japan.
    Search for more papers by this author
  • Tomokazu Iyoda,

    Corresponding author
    1. Division of Integrated Molecular Engineering, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku, Yokohama 226–8503, Japan
    • Division of Integrated Molecular Engineering, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku, Yokohama 226–8503, Japan
    Search for more papers by this author
  • Sadayuki Asaoka,

    1. Graduate School of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Kyoto 606–8585, Japan
    Search for more papers by this author
  • Haruyuki Nakanishi

    1. Fuel Cell System Development Division, Toyota Motor Corporation, 1200 Mishuku, Susono 410–1193, Japan
    Search for more papers by this author

Abstract

A simple fabrication, scalable to centimeter scale, of a permeable membrane made of block copolymer containing molecular transport channels is demonstrated by coating photo-crosslinkable liquid-crystalline block copolymer, consisting of poly(ethylene oxide) (PEO) and poly(methacrylate) (PMA) bearing stilbene (Stb) mesogens in the side chains (PEO114-b-PMA(Stb)52), onto a sacrificial cellulose acetate film substrate. After thermal annealing, perpendicularly aligned and hexagonally arranged PEO cylindrical domains with a surface density of 1011 cm−2 were formed and then fixed efficiently by photo-crosslinking the stilbene moieties in the PMA(Stb) domains by [2 + 2] dimerization. The fully penetrating straight PEO cylindrical domains across the 480-nm-thick membrane were well-defined and visualized as molecule-transport channels. After exfoliated by removal of the cellulose acetate layer, the membrane could be transferred onto another substrate by either scooping or a horizontal lifting method. Throughout the processes, the fully penetrating PEO channels across the membrane are preserved to open at both ends. A simple permeation experiment demonstrates that rhodamine dyes permeate efficiently through the PEO cylindrical channels of the annealed membrane but not across a non-annealed one.

Ancillary