Dielectric relaxation in polyimide nanofoamed films with low dielectric constant

Large Dielectric Constant and Maxwell-Wagner Relaxation in Bi2/3Cu3Ti4O12

Permittivity Measurements of High Dielectric Constant Films at Microwave Frequencies

We have developed a time-domain reflectometry (TDR) technique to measure the dielectric permittivity of high dielectric constant films. The test specimen consists of a planar capacitor terminating coaxial waveguide. The complex permittivity of the dielectric in the frequency domain is obtained from appropriate analysis of the incident and the reflected voltage waves. In order to improve accurac...

Dielectric relaxation of thin films of polyamide random copolymers.

We investigate the relaxation behavior of thin films of a polyamide random copolymer, PA66/6I, with various film thicknesses using dielectric relaxation spectroscopy. Two dielectric signals are observed at high temperatures, the α process and the relaxation process due to electrode polarization (the EP process). The relaxation time of the EP process has a Vogel-Fulcher-Tammann type of temperatu...

Dielectric Relaxation of Diethylsulfoxide

The dielectric loss spectrum of the title substance has been measured in its pure liquid state between 10 MHz and 72 GHz at 20°C. In comparison to the Debye function, it is slightly broadened towards the high frequency side. The maximum corresponds to a relaxation time of 51 ps. In view of the molecular size and viscosity, this is relatively long and thus indicative of associative intermolecula...

Dielectric Relaxation of Three

Relaxation spectra have been measured at 20°C for mono-, diand triethanolamine in the pure liquid state and in a 0.6 mole fraction mixture with 1,4-dioxane. The general resemblance to the dielectric behaviour of alcohols and aminoalcohols shows that relaxation is governed by association effects. In this regard, several features point to significantly differing behaviour of the mono compound in ...