Title :
Electrical conduction current in polytetrafluoroethylene
Author :
Sussi, Mohamed A. ; Raju, G. R Govinda
Author_Institution :
Dept. of Electr. Eng., Windsor Univ., Ont., Canada
Abstract :
Electrical conduction current in polytetrafluoroethylene (PTFE) polymer films of 50 μm and 130 μm thickness was studied under steady-state conditions at 40-200°C and at electric field strengths up to 246 kV cm-1 for 3-3600 s. The measured conduction currents in PTFE at various constant electrical field strengths and temperatures are examined in the light of Schottky, Poole-Frenkel, and ionic conduction mechanisms. The results are interpreted with reference to a space-charge effect with ionic conduction up to glass transition temperature of 120°C and an electric field strength up to 246 kV cm -1. Above 120°C and at an electric field strength above 100 kV cm-1, the results indicated electronic conduction. The current varied with voltage according to exp (αE)1/2 (E=electric field, α=constant), giving an activation energy (independent of the sample thickness) of about 0.3 eV
Keywords :
electrical conductivity of amorphous semiconductors and insulators; electronic conduction in insulating thin films; organic insulating materials; polymer films; 0.3 eV; 130 micron; 3 to 3600 s; 40 to 200 C; 50 micron; PTFE; Poole-Frenkel conduction mechanisms; Schottky conduction mechanisms; activation energy; electric field strengths; electronic conduction; glass transition temperature; ionic conduction mechanisms; polymer films; polytetrafluoroethylene; space-charge effect; steady-state conditions; temperatures; Conductive films; Current measurement; Dielectrics and electrical insulation; Electrodes; Polymer films; Temperature distribution; Temperature sensors; Thermal conductivity; Thermal resistance; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1990. Annual Report., Conference on
Conference_Location :
Pocono Manor, PA
DOI :
10.1109/CEIDP.1990.201342
