Abstract
Self-standing polymer membranes with nanopores were prepared by polymerization of a liquid-crystalline (LC) columnar mixture of a taper-shaped molecule having a photocleavable moiety and a lithium salt. The photocleavable moiety, o-nitrobenzyl ester links the dendritic polymerizable hydrophobic part containing vinyl groups and a hydrophilic tri(oxyethylene) chain. The mixture of the taper-shaped molecule and lithium triflate forms a columnar LC phase at a temperature range wider than 50 °C. Self-standing polymer membranes with nanostructures were prepared by acyclic diene metathesis (ADMET) polymerization of the LC mixtures. Ordered anionic nanochannels were formed in the polymer membranes by photocleavage reaction of the linkers between the polymerized hydrophobic part and the non-polymerizable hydrophilic part. The nanoporous membranes showed selective adsorption of cationic organic dyes from their aqueous solutions depending on charges and sizes of the molecules.
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