摘要
设计并合成了一个系列 4 (1 7 氯 1 2 ,1 2 ,1 3 ,1 3 ,1 4,1 4,1 5 ,1 5 ,1 6 ,1 6 ,1 7,1 7 十二氟十七烷氧基 )苯甲酸 4 多氟烷氧基酰基苯酚酯液晶 ,并通过偏光显微镜和DSC对其相变性质进行了观察和测量。发现当另一侧氟碳链短时 ,呈现互变近晶A相 ,随着氟碳链的增长 ,呈现单变近晶A相和近晶C相 。
A series of 4-(polyfluoroalkoxycarbonyl)phenyl 4-(17-chloro-12,12,13,13,14,14,15,15,16,16,17,17-dodecafluoroheptadecaoxy)benzoate were prepared. Their mesomorphic properties were observed and measured by optical polarizing microscopy and DSC. The results show that when the other fluorinated alkyl chain was short,the sample exhibited enantiotropic smectic A phase,but monotropic smectic A and smectic C phases were exhibited by these samples when the fluorinated alkyl chain became longer,at last,smectic A phase disappeared and only monotropic smectic C phase was observed.
出处
《液晶与显示》
CAS
CSCD
2002年第1期6-12,共7页
Chinese Journal of Liquid Crystals and Displays
基金
国家自然科学基金资助项目 ( 2 9974 0 38)
