二氟甲醚桥键类液晶是目前广泛使用的一类液晶化合物,但是其相关相变行为和物理参数很少有系统地报道.本文采用DSC、POM测试,对系列1和2共计7种含环己烷的四环骨架二氟甲醚桥键液晶单体的介晶性进行了研究,并考察了不同单体对混合液晶性能的影响规律,采用加法原理对各系列单体的物理性能参数进行了外推.结果表明,与系列2化合物相比,系列1单体具有更高的清亮点和更宽的向列相温度范围.系列2单体由于氟原子数的增加,介电各向异性值增大.系列1单体可显著改善混合液晶的低温相溶性,有利于拓宽混合液晶的使用温度.
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