Studies of ferroelectric properties of novel liquid crystals with tetrafluorophenylene

Author

Wang, Xian-Shan ; Wen, Jianxun

Author_Institution

Inst. of Org. Chem., Acad. Sinica, Shanghai, China

fYear

1996

fDate

25-30 Sep 1996

Firstpage

931

Lastpage

936

Abstract

Plotting polarization versus electric field with sine waveform is used to determine the ferroelectricity of liquid crystals in conjunction with other usual methods as optical polarizing microscope and differential scanning calorimeter. Results show that the liquid crystal with the molecular core structure of tetrafluorobiphenylene has a rather wide temperature range of ferroelectric mesophase SmC*, and 4´-[(s)-2-methylbutoxycarbonyl] phenyl 4-(4´-n-nonyloxy-2, 3, 5, 6-tetrafluorobiphenyl-1-ethynyl) benzoate exhibits the range of about 110°C from 60 to 170°C, the polarization of 8.9×10^-6 C/m² and the tilt angle of 9.2 degrees at temperature 10°C below curie point

Keywords

dielectric polarisation; ferroelectric liquid crystals; optical microscopy; organic compounds; smectic liquid crystals; thermal analysis; 4´-[(s)-2-methylbutoxycarbonyl] phenyl 4-(4´-n-nonyloxy-2, 3, 5, 6-tetrafluorobiphenyl-1-ethynyl) benzoate; 60 to 170 C; 9TFPEB; Curie point; SmC* mesophase; differential scanning calorimetry; ferroelectric properties; liquid crystal; molecular core structure; optical polarizing microscopy; polarization versus electric field characteristics; sine waveform; temperature range; tetrafluorophenylene; tilt angle; Current measurement; Ferroelectric materials; Hysteresis; Liquid crystal devices; Liquid crystals; Optical microscopy; Optical polarization; Production facilities; Sliding mode control; Temperature distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1996. (ISE 9), 9th International Symposium on

Conference_Location

Shanghai

Print_ISBN

0-7803-2695-4

Type

conf

DOI

10.1109/ISE.1996.578235

Filename

578235