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A series of 4′-n-Alklxybiphenyl-4-Carboxylic acids are synthesized via etherification, acetylation and oxidation by using 4-phenylphenol as raw material. The compounds are identified by using elemental analysis, infrared spectra and nuclear magnetion resonance. The liquid crystalline behavior of the compound 3 is characterized by differential scanning calorimetery(DSC) and polarizing optical microscopy(POM). It is found that the compound 3 went into liquid crystal phase when heated to their T m. The typical smectic phase and nematic phase texture can be observed. Both melting point(T m) and isotropization temperature(T i) of compound 3 change regularly with the carbon numbers of the end alkoxy groups. There is a gradual increase in smectic phase length and so do the smectic-nematic transition temperature. At the same time there is a gradual decrease in nematic phase length until in the dodecyl, purely smectic properties are encountered.
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Basic Information:
China Classification Code:O625.51
Citation Information:
[1]Zhang Xiaojing, Ma Dongling, Yang Juan, Cao Hongwei, Li Zifa (School of Materials and Engineering, Zhengzhou University, Zhengzhou 450052).Synthesis and Characterization of 4′-n-Alklxybiphenyl-4-Carboxylic Acids[J].Journal of Zhengzhou University(Natural Science Edition),2003(01):87-89+93.
Fund Information:
国家自然科学基金资助项目,编号 2 99740 2 6;; 河南省自然科学基金;; 河南省教育厅自然科学基金资助项目 .
2003-01-01
2003-01-01