Title :
Charging temperature effect for corona charged Teflon FEP electret
Author_Institution :
Pohl Inst. of Solid State Phys., Tongji Univ., Shanghai, China
Abstract :
The effect of charging temperature on charge storage of corona charged Teflon FEP (fluoroethylene propylene) electret is investigated. When the sample is negatively charged at elevated temperatures, a nonuniform charge distribution with the charge concentration in the near-surface that is greater than in the bulk is confirmed with the laser-induced pressure pulse method. By contrast, a uniform charge distribution throughout the bulk of the material is attainable so long as the sample is positively corona charged above 90°C. According to the charge distribution and the trap structure, analysis shows that the charging temperature plays an important role in the charge stability for the Teflon FEP electret
Keywords :
corona; dielectric polarisation; electrets; polymers; charge concentration; charge stability; charge storage; charging temperature; corona charged Teflon FEP electret; electret; fluoroethylene propylene; laser-induced pressure pulse method; nonuniform charge distribution; trap structure; uniform charge distribution; Corona; Current measurement; Electrets; Electrodes; Optical pulses; Ovens; Stability; Surface charging; Temperature distribution; Voltage;
Conference_Titel :
Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)
Conference_Location :
Berlin
Print_ISBN :
0-7803-0112-9
DOI :
10.1109/ISE.1991.167224
