Bent-shaped liquid crystals based on 4-substituted 3-hydroxybenzoic acid central core – Part II
Bent-shaped liquid crystals based on 4-substituted 3-hydroxybenzoic acid central core – Part II
复制标题
DOI：
10.1080/02678292.2015.1125535
复制
发表时间：
2015-01
期刊：
影响因子：
2.2
通讯作者：
J. Tůma;M. Kohout;J. Svoboda;V. Novotná;D. Pociecha
中科院分区：
文献类型：
--
作者：
J. Tůma;M. Kohout;J. Svoboda;V. Novotná;D. Pociecha
介绍了新型弯形液晶的合成及其亚晶性质。中心芳香环4位侧取代基的性质和末端烷基链的长度调节了材料的性能。通过在末端烷基链中引入额外的酯单元，实现了物理性质的进一步改性。用差示扫描量热法、偏光显微镜和x射线衍射测定了所研究材料的物理性质。讨论了结构变化以及酯键取向的影响（与先前描述的材料相比）。在所研究的化合物的结构中加入第五个酯单元会导致它们的介形行为发生重大变化。图形抽象
ABSTRACT The synthesis and mesomorphic properties of new series of bent-shaped liquid crystals are presented. The properties of the materials were tuned by the character of the lateral substituent in position 4 of the central aromatic ring and length of terminal alkyl chains. Further modification of physical properties was achieved by the introduction of an additional ester unit in the terminal alkyl chain. The physical properties of the studied materials were determined by differential scanning calorimetry, polarising optical microscopy and for selected compounds by x-ray diffraction. The influence of structural changes as well as the orientation of ester linkages (in comparison with previously described materials) is discussed. The addition of the fifth ester unit into the structure of the studied compounds leads to significant changes in their mesomorphic behaviour. GRAPHICAL ABSTRACT