Electric field and porosity dependent permittivity in electron beam irradiated PMMA

Author

Zheng, Feihu ; Zhang, Yewen ; Xiao, Chun ; Xia, Junfeng ; An, Zhenlian

Author_Institution

Pohl Inst. of Solid State Phys., Tongji Univ., Shanghai

fYear

2008

fDate

7-11 Sept. 2008

Firstpage

247

Lastpage

250

Abstract

The effect of electron beam radiation on permittivity of polymethyl methacrylate (PMMA) samples is investigated. Experimental results show that the variance of permittivity in irradiated PMMA is mainly determined by two factors. One is porosity of the material. The irradiating process increases the porosity due to the escape of the small molecule (e.g. CO, CO₂, CH₄ etc.) produced by material degradation. The other is the distribution of injected charge. If electric field generated by injected charge is not inverse symmetrical, the polar PMMA sample should be subjected to extra polarization by the field. Combining Wakinopsilas model of permittivity of mixture materials, Clausius-Mosotti equation is utilized to analyze the variation of permittivity in the irradiated PMMA samples.

Keywords

insulating materials; polymer insulators; porosity; porous semiconductors; electric field; electron beam irradiated PMMA; polymethyl methacrylate; porosity dependent permittivity; Aging; Dielectric materials; Dielectrics and electrical insulation; Electron beams; Equations; Frequency; Permittivity; Plastic insulation; Polymers; Space charge;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 2008. (ISEIM 2008). International Symposium on

Conference_Location

Mie

Print_ISBN

978-4-88686-005-7

Electronic_ISBN

978-4-88686-006-4

Type

conf

DOI

10.1109/ISEIM.2008.4664542

Filename

4664542