欢迎登录材料期刊网

材料期刊网

高级检索

设计并合成了4个系列的新型含三氟乙氧基羰基的其芳香环上含氟或不含氟原子取代的二苯乙炔类液晶化合物, 其相变行为通过偏光显微镜和差热分析进行了测试和观察. 发现目标化合物都呈现很宽的近晶A相, 当另一侧的碳氢链较短时, 还有较窄的向列相存在. 芳香环上引入的氟原子在有利于向列相的同时压缩了近晶相.

参考文献

[1] Gray, George W. Molecular Structure and Properties of Liquid Crystals [M]. Academic Press, New York, 1962.
[2] Xu Yuelian, Chen Qi, Wen Jianxun. Synthesis and mesomorphic properties of the homologous series of 4′-[(4-n-alkoxy-2, 3, 5, 6-tertafluorophenyl)]benzoates [J]. Liq. Cryst. 1993, 15(6):915-918.
[3] Xu Yuelian, Chen Qi, Wen Jianxun. Novel fluorinated liquid crystals. Part IV. The synthesis and phase transition of 4′-(n-alkoxycarbonyl)phenyl 4″-[(4-(s)-2′-methylbutoxy-2, 3, 5, 6-tetrafluorophenyl)ethynyl]benzoates [J]. Mol. Cryst., Liq. Cryst. 1994, 241:243-248.
[4] Wen Jianxun, Tian Minquan, Chen Qi. Novel fluorinated liquid crystals. Part VI. The synthesis and phase transition of novel cholesteric liquid crystals containing 1, 4-tetrafluorophenylene units [J]. J. of Fluorine Chem., 1994, 68:117-120.
[5] Wen Jianxun, Tian Minquan, Chen Qi. Novel fluorinated liquid crystals II. The synthesis and phase transitions of novel type of ferroelectric liquid crystals containing 1, 4-tetrafluorophenylene moiety [J]. Liq. Cryst., 1994, 16(3):445-451.
[6] Wen Jianxun, Tian Minquan, Yu Hongbin, et al. Novel fluorinated liquid crystals. Part 9. Synthesis and mesomorphic properties of 4-(n-alkoxy carbonyl)phenyl 4-[(4-n-alkoxy-2, 3, 5, 6-tetrafluorophenyl)ethynyl]benzoates [J].J. of Mater. Chem., 1994, 4(2):327-330.
[7] Wen Jianxun, Yin Huiyong, Tian Minquan, et al. Synthesis and mesomorphic properties of 4-n-alkoxy 4′-[4-((4-n-alkoxy-2, 3, 5, 6-tetrafluorophenyl) ethynyl)benzyloxy]benzoates [J]. Liq. Cryst., 1995, 19(4):511-517.
[8] Chen Ximin, Wen Jianxun. The mesomorphic anomaly of 4-[2-(4-alkoxy -2, 3, 5, 6-tetrafluorophenyl)ethynyl] phenyl trans-4-pentylcyclohexyl-1-carboxylates [J]. Liq. Cryst., 1999, 26(10):1563-1565.
[9] Guittard Frederic, Givenchy, Elisabeth Taffin, et al. Highly fluorinated thermotropic liquid crystals: an update [J]. J. Fluorine Chem., 1999, 100, 85-96.
[10] Tournilhac F, Blinov L M, Simon J. et al. Ferroelectric liquid crystals from achiral molecules [J]. Nature, 359(6396), 1992:621-623.
[11] Takenaka Shunsuke. Thermal properties of novel liquid crystals having a single benzene unit [J]. J. Chem. Soc. Chem. Commun., 1992, 23:1748-1749.
[12] Yang Yonggang, Chen Baoquan, Wen Jianxun. Synthesis and mesomorphic properties of semi-perfluorinated chain liquid crystals [J]. Liq. Cryst., 1999, 26(6):893-896.
[13] Chen Ximin, Li Hengfeng, Chen Zhang, et al. 2,3-Difluorinated phenyl and cyclohexane units in the design and synthesis of liquid crystals having negative dielectric anisotropy [J]. Liq. Cryst., 1999, 26:1743-1747.
[14] Xu Yuelian, Fan Pin, Chen Qi, et al. Novel fluorinated liquid crystals. Part 3. Synthesis and mesomorphic behaviour of liquid crystals incorporating a 2, 3, 5, 6-tetrafluorobiphenyl-4, 4′-diyl unit [J]. J. Chem. Research(S), 1994, 240-241.
[15] Demus D, Richter L. Textures of Liquid Crystals [M]. Verlag Chemie: Weinheim, Ger, 1978.
[16] Gray G W, Goodby J W. Smectic Liquid Crystals: Textures and Structures [M]. Heyden and Son: Philadelphia, Pa., 1984.
[17] Gray G W, Hird M, Toyne K J, The synthesis of several lateral difluoro-substituted 4, 4″-dialkyl- and 4, 4″-alkoxyalkylterphenyls and a rationalization of the effect of such substitution on mesophase type and transition temperatures [J]. Mol. Cryst. Liq. Cryst., 1991, 204:43-64.
[18] Dong Chu Chuan, Styring Peter, Goodby, John W, et al. The synthesis and electrooptic properties of liquid crystalline 2-(2, 3-difluorobiphenyl-4′-yl)-1, 3-dioxanes [J]. J. Mater. Chem., 1999, 9(8):1669-1678.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%