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设计并合成了 4个系列的新型含三氟乙氧基羰基的其芳香环上含氟或不含氟原子取代的二苯乙炔类液晶化合物 ,其相变行为通过偏光显微镜和差热分析进行了测试和观察。发现目标化合物都呈现很宽的近晶 A相 ,当另一侧的碳氢链较短时 ,还有较窄的向列相存在。芳香环上引入的氟原子在有利于向列相的同时压缩了近晶相。
Four series of new Trifluoroethoxycarbonyl group-containing liquid crystal compounds with or without fluorine atom substitution on the aromatic ring were designed and synthesized. Their phase transition behaviors were investigated by polarized light microscopy and differential thermal analysis Test and observe. The target compounds were all found to exhibit a broad smectic A phase with narrower nematic phase when the hydrocarbon chains on the other side were shorter. The fluorine atoms introduced on the aromatic ring compress the smectic phase while favoring the nematic phase.