Block copolymer permeable membrane with visualized high-density straight channels of poly(ethylene oxide)

Takashi Yamamoto, Taro Kimura, Motonori Komura, Yukimitsu Suzuki, Tomokazu Iyoda, Sadayuki Asaoka, Haruyuki Nakanishi

Research output: Contribution to journalArticle

42 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)918-926
Number of pages9
JournalAdvanced Functional Materials
Volume21
Issue number5
DOIs
Publication statusPublished - 2011 Mar 8

Keywords

  • block copolymers
  • membranes
  • permeability
  • photo-crosslinking

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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