Dielectric properties of Teflon from room temperature to 314°C and from frequencies of 10² to 10⁵ c/s

Abstract

The dielectric constant and dissipation factor of Teflon were measured at frequencies from 10 2 to 10 5 cis and from room temperature to temperatures j ust below the first-order t.ransition point occurring at 327 0 O. Measurements of the d-c conductivity were made over the same temperature int.erval. R esult s show t hat the dielectric constant decreases somewhat with increasing temperature. T he relation between thermal-expansion coeffi cient and temperature coeffi cient of t he dielectric constant is roughly as predicted by the Clausius-Mossotti equation. Val ues of dissipation factor ann d-c eonductivity at all temp eratures are v~ry low (less than 2 X 10-4 and 2 X 10-15 mho /em, respectively), and the dielectric constant is independent of frequency at all temperatures.

Modular arbitrary waveform dielectric spectrometer for aging diagnostics of recessed specimens

“…The measured dielectric properties of PTFE ( Fig. 3) agree well with the ones reported in literature, which are tan(δ)<10 -4 in the considered frequency range, and an approximately constant magnitude |ε| of a value between 2 and 2.1 [9]. The expected relative magnitude accuracy of 1% to 2% − mainly determined by the nominal accuracy of the transimpedance gain and the error on sample thickness measurement − could thus be confirmed.…”

Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

“…Polytetrafluoroethylene (PTFE) has favorable properties like high chemical and biological tolerance, thermal stability, as well as its excellent dielectric, antifriction, and antiadhesive properties, polytetrafluoroethylene (PTFE) is a preferable material for the manufacture of articles in different industries and engineering [ 1 , 2 , 3 , 4 , 5 , 6 ]. For tribological applications, PTFE is also an expedient polymer material that is widely available.…”

Measuring the permittivity and permeability of lossy materials :

“…• Measurements on plastics are given in References [9,[161][162][163][164][165][166][167][168][169][170][171][172].…”