Influence of hydrogen bonding on phase abundance in ferroelectric liquid crystals

被引：51
|
作者：
Sridevi, B
Chalapathi, PV
Srinivasulu, M
Pisipati, VGKM
Potukuchi, DM [1 ]
机构：
[1] Jawaharlal Nehru Technol Univ, Coll Engn, Dept Phys, Kakinada 533003, India
[2] Manipal Acad Higher Educ, Dept Chem, Manipal 576119, India
[3] Nagarjuna Univ, Fac Phys Sci, Ctr Liquid Crystal Res & Educ, Nagarjuna Nagar 522510, Andhra Pradesh, India
来源：
LIQUID CRYSTALS | 2004年 / 31卷 / 03期
关键词：
D O I：
10.1080/02678290410001648705
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The synthesis and characterization of five hydrogen-bonded ferroelectric liquid crystal complexes (HBFLCs) prepared from mesogenic p-n-alkoxy benzoic acids and non-mesogenic propionic/butyric acids with different chiral centres are reported. Complementary intermolecular hydrogen bonding is confirmed through IR study. HBFLCs are found to exhibit chiral nematic (N*), smectic C* (SmC*) and smectic G* (monotropic) phases in their cooling profiles during polarizing thermal microscopy and differential scanning calorimetry. Phase coexistence regions are observed above the IN* transition. The chiral nematic to smectic C* transition is found to be of first order. The temperature variation of spontaneous polarization exhibited by these HBFLC complexes in their SmC* phase is presented. The effect of non-covalent interaction imparted by the soft hydrogen bonding in these LC complexes on enhanced or induced thermal stability of tilted LC phases is discussed.
引用
收藏
页码：303 / 310
页数：8
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