Charging transient in polyvinyl formal

[摘要] In the present paper charging and discharging transient currents in polyvinyl formal (PVF) were measured as a function of temperatures (40â€�??80°C), poling fields (9.0 Ã�? 10³â€�??9.0 Ã�? 10⁴ V/cm) and electrode combinations (Alâ€�?�Al, Auâ€�?�Al, Znâ€�?�Al, Biâ€�?�Al, Cuâ€�?�Al and Agâ€�?�Al). The currentâ€�?�time characteristics have different values of slope lying between 0.42â€�??0.56 and 1.42â€�??1.63. The polarization is considered to be due to dipolar reorientation associated with structural motions and space charge relaxations due to trapping of injected charge carriers in energetically distributed traps.

[学科分类] 材料工程

[关键词] Charging transient currents;polyvinyl formal;dipolar mechanism;space charge relaxations.