Charge dynamic characteristics in corona-charged polytetrafluoroethylene film electrets.
J Zhejiang Univ Sci
; 5(8): 923-7, 2004 Aug.
Article
en En
| MEDLINE
| ID: mdl-15236476
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 surface 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 crystallinity.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Politetrafluoroetileno
Idioma:
En
Revista:
J Zhejiang Univ Sci
Asunto de la revista:
CIENCIA
Año:
2004
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
China