Synthesis, mesomorphic and dielectric properties of new bent-core liquid crystal with a terminal lactate group


Ocak H. , Yılmaz Canlı N. , Bilgin Eran B.

JOURNAL OF MOLECULAR STRUCTURE, cilt.1223, ss.128975-128985, 2020 (SCI Expanded İndekslerine Giren Dergi)

  • Cilt numarası: 1223
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.molstruc.2020.12897
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Sayfa Sayıları: ss.128975-128985

Özet

The synthesis, liquid crystalline properties and dielectric properties of a new bent-core compound (DBOB) composed of terephthalate based rod-like units with a O-dodecyl lactate group substituted at one side as well as n-octyloxy located at other terminal are presented. The liquid crystalline properties have been investigated by polarizing optical microscopy, differential scanning calorimetry and electro-optical studies. The dielectric parameters and phase regions of DBOB, which exhibits an enantiotropic non-polar SmA phase between 156 and 100 °C as well as SmA phase with a ferroelectric polar response at lower temperatures than 100 °C, have been carried out by impedance spectroscopy at different temperatures. The dielectric relaxation mechanisms have been analyzed by Cole-Cole plots. The Debye distribution parameters and activation energies have also been determined.