Title :
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
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;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578235
