Macroscopically Aligned Helical Conjugated Polymers in Orientation-Controllable Chiral Nematic Liquid Crystal Field
Macroscopically Aligned Helical Conjugated Polymers in Orientation-Controllable Chiral Nematic Liquid Crystal Field
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DOI：
10.1021/ma9000034
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发表时间：
2009-02
期刊：
影响因子：
5.5
通讯作者：
Taizo Mori;Tetsuya Sato;M. Kyotani;K. Akagi
中科院分区：
文献类型：
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作者：
Taizo Mori;Tetsuya Sato;M. Kyotani;K. Akagi
采用由垂直取向诱导剂、手性掺杂剂和母体N- lc组成的定向手性向列相液晶（N*- lc）合成了水平和垂直取向的螺旋聚乙烯烃（H-PAs）。提出了水平和垂直N*-LCs及其相应的宏观排列H-PAs的化学可抓图，为N*-LCs和H-PAs的合成提供了指导。发现N*-LCs虽然含有垂直取向诱导剂，但仍表现为水平取向和垂直取向。系统测试表明，N*-LC的水平取向或垂直取向敏感地取决于(i)垂直取向诱导剂和手性掺杂剂的相对浓度，（ii）垂直取向诱导剂与母体N-LC的混相，以及（iii）手性掺杂剂的螺旋扭转力。换句话说，垂直取向诱导剂和手性掺杂剂之间的有效强度平衡占主导地位。
Horizontally and vertically aligned helical polyacetylenes (H-PAs) are synthesized by using orientation-controlled chiral nematic liquid crystals (N*-LCs) consisting of vertical orientation inducers, chiral dopants and parent N-LC. The chemically graspable pictures of horizontal and vertical N*-LCs and the corresponding macroscopically aligned H-PAs are put forward as a guideline of the syntheses of the N*-LCs and H-PAs. It is found that the present N*-LCs show horizontal and vertical orientations, although they include the vertical orientation inducer. Systematic examinations indicate that the horizontal or vertical orientation of the N*-LC sensitively depends on (i) the relative concentrations of the vertical orientation inducer and the chiral dopant, (ii) the miscibility of the vertical orientation inducer to the parent N-LC, and (iii) the helical twisting power of the chiral dopant. In other words, the balance in effective strength between the vertical orientation inducer and the chiral dopant dominat...