perfluorooctyl group on the other side have been designed and prepared. Their liquid crystalline properties were investigated by a combination of three techniques: polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and variable-temperature powder X-ray diffraction (XRD). Their thermal stability was studied by thermogravimetric analysis (TG). It was found that only the compounds
设计并制备了一系列新颖的N-
苯甲酰基-N'-芳基
硫脲衍
生物(
BTU),其在
苯甲酰基单元的末端位置和另一侧的
全氟辛基具有不同数目的烷
氧基。通过三种技术的组合研究了它们的
液晶特性:偏振光学显微镜(POM),差示扫描量热法(
DSC)和变温粉末X射线衍射(XRD)。通过热重分析(TG)研究了它们的热稳定性。发现仅具有仅一个烷
氧基链连接至
苯甲酰基单元1a和1b的化合物,显示出弯曲的介晶行为,并显示出近晶的A和C相。这些中间相的类型和稳定性受烷基链长以及
全氟辛基基团的存在的影响。当与
全氟烷基类似物相比,
全氟烷基链的引入,其澄清和中间相的范围显着增加,几乎达到40°C。在
苯甲酰基部分上附加的烷
氧基的附着导致清除点的显着降低和介晶特性的抑制。