Annealing Effects on Dielectric Constant/Dielectric Loss Measurements in Vectra-A, Liquid Crystal Copolyester

Abstract

The strengthening consequences for dielectric constant (ε') and dielectric loss (ε''), for Vectra-A samples, after annealing, fluctuating with temperature (25°C to 250°C) at various frequencies (1 kHz to 1 MHz), have been contemplated. In annealing phenomenon, the dielectric properties decrease due to transition of amorphous phase to crystalline phase. The dielectric constant (ε') is very small in annealed samples of Vectra-A in contrast to pristine samples. The magnitude of β-relaxation becomes small in variation of dielectric loss (εʹʹ) with temperature because the dipolar relaxation reduces due to enhancement in crystallinity.

Keywords: Vectra-A, liquid crystal copolyester, dielectric spectroscopy (DS) dielectric constant (ε'), dielectric loss (ε'')

Cite this Article

Sapna Kalia, Vandana Sharma, J.K. Sharma et al. Annealing Effects on Dielectric Constant/Dielectric Loss Measurements in Vectra-A, Liquid Crystal Copolyester. Research & Reviews: Journal of Physics. 2018; 7(3): 79–84p.