短烷基系列芳醛类液晶材料的合成及其相变规律研究

Study on synthesis of aryl aldehydes with shorter alkyls and their rule of changing phase

通过室温反应合成了系列C3和C5烷基取代的多环单酯基苯甲醛类液晶,研究了室温羧酸氯化有效抑制反式环己烷构型转化的机理,讨论了不同的端基、环体系对化合物液晶相变区间、焓变及熵变的影响。结果表明,该类芳香醛化合物端基与环体系的改变使化合物的液晶相温度范围、焓变及熵变呈现规律性的改变,且环体系对化合物液晶性质的影响远大于末端烷基。

A series of multi-ring monoesteryl aryl aldehydes substituted by n-propyl, n-pentyl were synthesized by reactions at room temperature. And the mechanism of chloridizing at room temperature that could restrain configuration transform of trans-cyclohexane was researched. The influence of various alkyl and ring system on the range of liquid crystal enthalpy changes and entropy changes was discussed. The result showed the range of liquid crystals, enthalpy changes and entropy changes changed regularly as the change of terminal groups and ring system, and the ring system had higher influence on liquid crystal property than terminal groups.