A Mixed Cyclodextrin-Biphenyl Thermotropic Liquid Crystal: Synthesis, Liquid-Crystalline Properties, and Supramolecular Organization
A Mixed Cyclodextrin-Biphenyl Thermotropic Liquid Crystal: Synthesis, Liquid-Crystalline Properties, and Supramolecular Organization
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DOI：
10.1002/pola.24060
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发表时间：
2010-07-01
影响因子：
--
通讯作者：
Zhang, Hai-Liang
中科院分区：
文献类型：
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作者：
Chen, Li;Hu, Tian-Hui;Zhang, Hai-Liang
以6-（4-甲氧基联苯-4 '-基氧基）己酸炔丙酯（P6 B）和七（6-脱氧-6-叠氮基）-β-环糊精（（N-3）（7）-β-CD）为原料，通过点击反应合成了结构明确的七[6-脱氧-6-（1-H-1，2，3-三唑-4-基）（甲基）6-（4-甲氧基联苯-4'-基氧基）己酰基] β-环糊精（H6 B-beta-CD）。H6 B-β-CD的化学结构经H-1 NMR、FTIR和MALDI-TOF MS确证，热重分析（TGA）考察了其热稳定性。通过差示扫描量热法（DSC）、偏光显微镜（POM）和广角X射线衍射（WAXD）研究了其液晶行为。结果表明，H6 B-β-CD的超分子结构在低温区由大尺度有序片层结构和小尺度有序结构（SmE）组成。随着温度的升高，小尺度结构首先变得相对无序，从近晶E到近晶A。然后，片层结构崩溃，并观察到连续相和各向同性相的顺序。(C)2010 Wiley Periodicals，Inc.聚合物科学杂志A部分：聚合物化学48：2838-2845，2010年
A well-defined structure liquid crystal heptakis [6-deoxy-6-(1-H-1,2,3-triazol-4-yl)(methyl)6-(4-methoxybiphenyl-4'-yloxy) hexanoyl]beta-cyclodextrin (H6B-beta-CD) was synthesized from propargyl 6-(4-methoxybiphenyl-4'-yloxy) hexanoate (P6B) and heptakis (6-deoxy-6-azido)-beta-cyclodextrin ((N-3)(7)-beta-CD) by click reaction. The chemical structure of H6B-beta-CD was confirmed by H-1 NMR, FTIR, and MALDI-TOF MS. The thermal stability of the compound was investigated by thermogravimetric analysis (TGA). The liquid crystalline behavior was studied by differential scanning calorimetry (DSC), polarizing optical microcopy (POM), and wide-angle X-ray diffraction (WAXD) measurement. These investigations have shown that the supramolecular structure of H6B-beta-CD are consisted of a large scale ordered lamellar structure and a small scale ordered structure (SmE) at low temperature region. As the temperature increases, the small scale structure becomes disordered relatively in the first instance, from smectic E to smectic A. Then, the lamellar structure collapses and nematic phase and isotropic phase are observed in sequence. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2838-2845, 2010