Kaneko Kosuke, Mandai Atsuhiko, Heinrich Benoît, Donnio Bertrand, Hanasaki Tomonori
Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 (CNRS-Université de Strasbourg), 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France.
Soft Matter. 2023 Nov 29;19(46):9115-9122. doi: 10.1039/d3sm00801k.
Novel hybrid silsesquioxane-based liquid crystalline derivatives with varied lengths of spacers and tails have been synthesized by hydrosilylation reactions of octakis(dimethylsiloxy)silsesquioxane and side-on mesogens a platinum catalyst. The thermal behavior of three types of silsesquioxane-based liquid crystals (LCs), differentiated by the molecular structure of mesogens, was investigated by differential scanning calorimetry (DSC) and polarising optical microscopy (POM). Temperature-dependent small and wide-angle X-ray scattering was used to verify liquid crystalline phases, revealing that the silsesquioxane-based derivatives formed hexagonal columnar and nematic mesophases, and the effect of the molecular structure of the mesogens and the spacer length on the formation of LC phases is discussed. This investigation demonstrated that the choice of the "side-on" attachments plays a crucial role in enhancing the emergence of the nematic phase.
通过八（二甲基硅氧基）倍半硅氧烷与侧基液晶元在铂催化剂存在下的硅氢化反应，合成了具有不同间隔基和尾链长度的新型杂化倍半硅氧烷基液晶衍生物。通过差示扫描量热法（DSC）和偏光光学显微镜（POM）研究了三种由液晶元分子结构区分的倍半硅氧烷基液晶（LC）的热行为。利用温度相关的小角和广角X射线散射来验证液晶相，结果表明倍半硅氧烷基衍生物形成了六方柱状相和向列相，并讨论了液晶元分子结构和间隔基长度对液晶相形成的影响。该研究表明，“侧基”连接方式的选择在增强向列相的出现方面起着关键作用。
