含有扭曲晶界相手性液晶AEMBB的合成

根据具有强扭曲的扭曲晶界相(TGB)理论,设计并合成了一种含有TGBC*相态的手性液晶单体(+)4-(2-丙烯酰氧基)乙氧基苯甲酰氧基-4′-(2-甲基)丁氧基]联苯酯(AEMBB).通过红外光谱分析反应物的羧酸基和羟基峰的消失判断反应完成;通过核磁共振确定各氢原子位置以确定目标产物的实现;并通过偏光显微镜和DSC研究了目标产物的液晶性能和相转变类型.结合偏光显微镜和DSC证明单体AEMBB存在胆甾、扭曲晶界和手性近晶C等多种相态,为互变液晶.

Synthesis of Chiral Liquid Crystal AEMBB with Twist Grain Phases

The chiral liquid crystal monomer (+)4-(2-acryloyloxy)-ethoxybenzoyloxy-4'-(2-methyl)-butoxy] biphenyl (AEMBB) was designed and synthesized according to the theory of twist grain boundary (TGB) which can be observed in chiral materials with strong twisting power. The termination of the reaction process can be judged according to the carboxylic acid/hydroxyl peak vanished from the reactant by Fourier transform infrared spectroscopy (FTIR). The implementation of the target chemical structure of the monomer depends on the position of ¹H as determined by the spectroscopy of ¹H nuclear magnetic resonance (NMR). The properties and phase transition of the target monomer were studied by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC), and the results revealed that the monomer is an enantiotropic liquid crystal available to be in cholesteryl, twist grain or chiral smectic C phases.