Class
Article
College
College of Science
Department
Physics Department
Faculty Mentor
JR Dennison
Presentation Type
Oral Presentation
Abstract
Temperature-dependent electrical conductivity measurements of polymers are compared to predictions by thermally assisted hopping conductivity, commonly used to model electron transport between defect sites in highly disordered insulating materials (HDIM). Constant voltage is applied across samples using a parallel plate geometry under vacuum, with the resulting current measured using a high resolution electrometer to calculate extreme low level conductivity. Conductivity of thin film PEEK (polyether ether ketone) and LDPE (low density polyethylene) samples was measured at temperatures ranging from 270 to 350 K to determine temperature influence on conductivity. Long time scales are needed for polymers to reach electrostatic equilibrium to isolate the different conduction mechanisms present in insulators from the temperature dependence under study. Results include determination of the rate of change in conductivity over change in temperature of the materials using two methods over narrow and wide temperature ranges, demonstrating the sensitive effect temperature has on the conductivity of HDIM.
Location
Room 154
Start Date
4-10-2019 9:00 AM
End Date
4-10-2019 10:15 AM
Included in
Temperature-Dependent Conductivity of Highly Insulating Polymers
Room 154
Temperature-dependent electrical conductivity measurements of polymers are compared to predictions by thermally assisted hopping conductivity, commonly used to model electron transport between defect sites in highly disordered insulating materials (HDIM). Constant voltage is applied across samples using a parallel plate geometry under vacuum, with the resulting current measured using a high resolution electrometer to calculate extreme low level conductivity. Conductivity of thin film PEEK (polyether ether ketone) and LDPE (low density polyethylene) samples was measured at temperatures ranging from 270 to 350 K to determine temperature influence on conductivity. Long time scales are needed for polymers to reach electrostatic equilibrium to isolate the different conduction mechanisms present in insulators from the temperature dependence under study. Results include determination of the rate of change in conductivity over change in temperature of the materials using two methods over narrow and wide temperature ranges, demonstrating the sensitive effect temperature has on the conductivity of HDIM.