| Charge dynamic characteristics in corona-charged polytetrafluoroethylene film electrets |
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| 作者姓名： | 陈钢进 肖慧明 朱春凤 |
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| 作者单位： | Institute of Functional Material Research，Zhejiang University of Science and Technology，Hangzhou 310027，China，Institute of Functional Material Research，Zhejiang University of Science and Technology，Hangzhou 310027，China，Institute of Functional Material Research，Zhejiang University of Science and Technology，Hangzhou 310027，China |
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| 基金项目： | Project (No. M503126) supported by the Natural Science
Foundation of Zhejiang Province，China |
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| 摘 要： | INTRODUCTION Polytetrafluoroethylene (PTFE) is one of themost important high insulating organic polymerelectret material which have been applied in manyfields such as sensors, generators and motors,dose-meters, and air filters at high temperature,biofunctional materials etc., especially since theexcellent charge storage stability and highquasi-static and dynamic piezoelectric coefficientsin porous PTFE film are reported (Xia et al., 1999;Schw?diauer et al.…
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Charge dynamic characteristics in corona-charged polytetrafluoroethylene film electrets |
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| CHEN Gang-jin XIAO Hui-ming,ZHU Chun-feng.Charge dynamic characteristics in corona-charged polytetrafluoroethylene film electrets[J].Journal of Zhejiang University Science,2004(8). |
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| Authors: | CHEN Gang-jin XIAO Hui-ming ZHU Chun-feng |
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| Abstract: | In this work, the charge dynamics characteristics of injection, transport and decay in porous and non-porous polytetrafluoroethylene (PTFE) film electrets were investigated by means of corona charging, isothermal and thermal stimulating surface-potential decay measurements. The results showed that the initial surface potential, whether positively or negatively charging, is much higher in non-porous PTFE than in porous PTFE. For porous film the value of initial sur- face potentials increases with increase of film thickness. Higher charging temperature can remarkably improve charge stability. The charge dynamics are correlated to materials microstructure according to their scanning electron micrographs. For non-porous PTFE films, polarizability change of C-F bonds is the main origin of electret charges; but for porous PTFE film a large number of bulk and interface type traps are expected because of the greater area of interface and higher crys- tallinity. |
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| Keywords: | Polymer electrets Charge dynamics Material microstructure |
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