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Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (8): 755-759. Previous Articles     Next Articles

Original Articles

含X-型二维液晶基元和冠醚环的液晶共聚酯的研究

张淑媛1, 徐晓辉2, 王经武2, 杜洋2, 李晓威2, 王鹏飞1, 李自法*,2   

  1. (1郑州大学化学系 郑州 450052)
    (2郑州大学材料工程学院 郑州 450052)
  • 投稿日期:2006-07-04 修回日期:2006-11-20 发布日期:2007-04-28
  • 通讯作者: 李自法

Study of Liquid Crystalline Copolyesters with X-Shaped Two-dimensional Mesogenic Units and Crown Ether Cycle

ZHANG Shu-Yuan1; XU Xiao-Hui2; WANG Jing-Wu2; DU Yang2; LI Xiao-Wei2; WANG Peng-Fei1; LI Zi-Fa*,2   

  1. (1 Department of Chemistry, Zhengzhou University, Zhengzhou 450052)
    (2 College of Materials Engineering, Zhengzhou University, Zhengzhou 450052)
  • Received:2006-07-04 Revised:2006-11-20 Published:2007-04-28

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A novel series of main chain liquid crystalline copolyesters with X-shaped two-dimensional mesogenic units and crown ether cycles of trans-4,4'-bis(4-hydroxyphenylazo)dibenzo-14-crown-4 were synthesized and their mesomorphic properties were studied through GPC, [η], DSC, TG, WAXD and POM. It was found that all the copolyesters showed the thread texture or schlieren texture. Their melting temperature (Tm) and isotropization temperature (Ti) were changed regularly with varying the trans-4,4'-bis- (4-hydroxyphenylazo)dibenzo-14-crown-4 unit content in the co-polyesters.

Key words: X-shaped two-dimensional unit, dibenzo-14-crown-4, liquid crystalline copolyester