Yoshio Masafumi, Kagata Takayoshi, Hoshino Koji, Mukai Tomohiro, Ohno Hiroyuki, Kato Takashi
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
J Am Chem Soc. 2006 Apr 26;128(16):5570-7. doi: 10.1021/ja0606935.
We have prepared two types of one-dimensional ion-conductive polymer films containing ion nanochannels that are both perpendicular and parallel to the film surface. These films have been obtained by photopolymerization of aligned columnar liquid crystals of a fan-shaped imidazolium salt having acrylate groups at the periphery. In the columnar structure, the ionic part self-assembles into the inner part of the column. The column is oriented macroscopically in two directions by different methods: orientation perpendicular to the modified surfaces of glass and indium tin oxide with 3-(aminopropyl)triethoxysilane and orientation parallel to a glass surface by mechanical shearing. Ionic conductivities have been measured for the films with columnar orientation vertical and parallel to the surface. Anisotropic ionic conductivities are observed for the oriented films fixed by photopolymerization. The ionic conductivities parallel to the columnar axis are higher than those perpendicular to the columnar axis because the lipophilic part functions as an ion-insulating part. The film with the columns oriented vertically to the surface shows an anisotropy of ionic conductivities higher than that of the film with the columns aligned parallel to the surface.
我们制备了两种含有离子纳米通道的一维离子导电聚合物薄膜，这些纳米通道既垂直于薄膜表面，也平行于薄膜表面。这些薄膜是通过对一种在周边带有丙烯酸酯基团的扇形咪唑鎓盐的取向柱状液晶进行光聚合反应得到的。在柱状结构中，离子部分自组装到柱体内部。通过不同方法使柱体在宏观上沿两个方向取向：用3-(氨丙基)三乙氧基硅烷使其垂直于玻璃和氧化铟锡的改性表面取向，以及通过机械剪切使其平行于玻璃表面取向。已对柱状取向垂直于和平行于表面的薄膜进行了离子电导率测量。对于通过光聚合固定的取向薄膜，观察到了各向异性离子电导率。平行于柱状轴的离子电导率高于垂直于柱状轴的离子电导率，因为亲脂部分起到离子绝缘部分的作用。柱体垂直于表面取向的薄膜所显示的离子电导率各向异性高于柱体平行排列于表面的薄膜。
