Monotropic smectic A to double layer smectic C transition of biphenyl containing liquid crystal acetylene  

作　　者：Zhen Qiang Yu CaiZhenZhu Zhe Zhang Jian Hong Liu Jacky W.Y. Lam Ben Zhong Tang 

机构地区：[1]Shenzhen Key Laboratory of Functional Polymers and School of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, China [2]Department of Chemistry The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon,China

出　　处：《Chinese Chemical Letters》2011年第11期1355-1358,共4页中国化学快报（英文版）

基　　金：the financial supports of National Natural Science Foundation of China (No21074073);Shenzhen Key Laboratory of Functional Polymers(NoFP20100011)

摘　　要：5-[（4＇-Heptoxy-4-biphenylyl）carbonyloxy]-1-pentyne（A-3,7） was synthesized and the phase structures and transitions were investigated by differential scanning calorimetry（DSC）,wide angle X-ray diffraction（WAXD）,polarized light microscopy（PLM） and the molecular packing in the crystal and liquid crystalline phases were simulated by molecular dynamic simulation.The results showed that the sample formed thermodynamically metastable SmA and SmC_2 phases before crystallized during cooling and the crystal phase directly transformed into isotropic phase during heating.5-[（4＇-Heptoxy-4-biphenylyl）carbonyloxy]-1-pentyne（A-3,7） was synthesized and the phase structures and transitions were investigated by differential scanning calorimetry（DSC）,wide angle X-ray diffraction（WAXD）,polarized light microscopy（PLM） and the molecular packing in the crystal and liquid crystalline phases were simulated by molecular dynamic simulation.The results showed that the sample formed thermodynamically metastable SmA and SmC_2 phases before crystallized during cooling and the crystal phase directly transformed into isotropic phase during heating.

关 键 词：Liquid crystal Phase structure Phase transition Smectic phase X-ray diffraction 

分 类 号：O633.1[理学—高分子化学] TQ453.22[理学—化学]