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Citation: YAO Dan-Shu, ZHANG Bao-Yan, HU Jian-She, WANG Fang-Fang. Synthesis and Phase Behavior of a Kind of Four-Armed Liquid Crystals[J]. Chinese Journal of Applied Chemistry, ;2007, 24(1): 40-44. shu

Synthesis and Phase Behavior of a Kind of Four-Armed Liquid Crystals

1.
The Research Centre for Molecular Science and Engineering, Northeastern University, Shenyang 110004

Received Date: 19 February 2006
Available Online: 22 May 2006
Fund Project: 国家自然科学基金(20374009) (20374009)辽宁省科学技术基金(20051014)资助项目 (20051014)

A new class of star-shaped four-armed liquid crystals based on pentaerythritol as a flexible core was synthesized by aromatic esterification.Their chemical structures were confirmed by means of elemental analysis, IR and ¹H NMR characterizations, their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction.The results show that t_m,t_i,t_ic and t_c decreases as the carbon chain of the terminal groups increases.They displayed broken focal-conic and focal-conic texture in liquid crystal states, and had a wide mesophase temperature range.The t_m and t_i of D1~D4 were 92.3℃, 80.6℃, 68.3℃, 51.1℃ and 159.2℃, 145.1℃, 127.5℃, 109.8℃ respectively, the mesogenic region △t₁ decreased from 66.9℃ to 58.7℃; while the t_ic and t_c were 138.6℃, 127.4℃, 111.6℃, 99.1℃ and 57.1℃, 52.6℃, 42.0℃, 31.8℃ respectively, the mesogenic region △t₂ decreased from 81.5℃ to 67.3℃.
- four-armed liquid crystal,
- synthesis,
- texture,
- smectic phase
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