Temperature dependency of impedance spectroscopy behaviors in side-chain liquid crystalline polymer

Okutan, Mustafa; Köysal, Oğuz; San, Sait Eren; Şentürk, E.

doi:10.1016/j.jnoncrysol.2009.08.046

Cited by 13 publications

(2 citation statements)

References 31 publications

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“…Therefore, the dielectric spectroscopy (DS) method has been used extensively for investigation of LCs. [1][2][3][4][5][6][7][8][9][10] We should note the difference between dielectric response of low-molecular-weight LCs and polymer LCs. In low-molecular-weight LCs, rotation of whole molecules around their long/short axes can be seen.…”

Section: Introductionmentioning

confidence: 98%

Polyazomethine with m-tolylazo side groups: thermal, dielectric and conductive behaviour

et al. 2015

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2015): Polyazomethine with mtolylazo side groups: thermal, dielectric and conductive behaviour, Liquid Crystals, Using solution polycondensation, a new polyazomethine with m-tolylazo side groups (PAz) exhibiting thermotropic liquid crystalline phase was synthesised and its chemical structure was characterised with generally accepted methods. Its phase transition temperatures were detected with both polarising optical microscopy and differential scanning calorimetry. Using dielectric spectroscopy method, both real and imaginary parts of the permittivity were investigated in wide regions of temperature (from −100°C to 170°C) and frequency (from 1 Hz to 1 MHz). Analysis of frequency dependent permittivity allowed finding three relaxations (α, β 1 and β 2 ) in PAz. β-relaxations were described with the Arrhenius equation, whereas α-relaxation was described with the Vogel-Fulcher-Tammann equation. The alternating current conductivity (ACC) of PAz was studied in the same regions of temperature and frequency. The frequency dependent ACC was described with an exponent power equation. Presentation of ACC as a function of inverse temperature allowed us to describe ACC with the Arrhenius equation.

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