Dielectric relaxation study of poly(ethylene glycols) using TDR technique

Dielectric permittivity ε′ and dielectric loss spectra ε″ as a function of log frequency (GHz) plotted at 25 °C for poly(ethylene glycols) of molecular weights 200, 300, 400 and 600 g mol− 1 with theoretical Cole-Cole fit shown by solid lines in the curve. The dielectric loss peak observed to be shifted toward lower frequency for lower molecular weights PEGs.