Block Copolymer Permeable Membrane with Visualized High‐Density Straight Channels of Poly(ethylene oxide)
Block Copolymer Permeable Membrane with Visualized High‐Density Straight Channels of Poly(ethylene oxide)
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DOI：
10.1002/adfm.201002069
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发表时间：
2011-03
影响因子：
19
通讯作者：
Takashi Yamamoto;Taro Kimura;M. Komura;Yukimitsu Suzuki;T. Iyoda;S. Asaoka;H. Nakanishi
中科院分区：
文献类型：
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作者：
Takashi Yamamoto;Taro Kimura;M. Komura;Yukimitsu Suzuki;T. Iyoda;S. Asaoka;H. Nakanishi
通过将可光交联的液晶嵌段共聚物（PEO 114-B-PMA（StB）52）涂覆到牺牲乙酸纤维素膜基底上，证明了由含有分子传输通道的嵌段共聚物制成的渗透膜的简单制造（可扩展到厘米级）。所述液晶嵌段共聚物由在侧链中带有芪（StB）介晶的聚（环氧乙烷）（PEO）和聚（甲基丙烯酸酯）（PMA）组成。在热退火后，形成垂直排列和六边形排列的PEO圆柱形域，其表面密度为1011 cm-2，然后通过[2 + 2]二聚化使PMA（Stb）域中的芪部分光交联而有效地固定。穿过480 nm厚的膜的完全穿透的直PEO圆柱形域是明确的，并且被可视化为分子运输通道。在通过去除醋酸纤维素层而剥离之后，可以通过铲取或水平提升方法将膜转移到另一个基底上。在整个过程中，整个膜的完全穿透的PEO通道保持在两端开放。一个简单的渗透实验表明，罗丹明染料有效地渗透通过退火膜的PEO圆柱形通道，但不穿过非退火膜。
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.