Title :
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
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;
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
DOI :
10.1109/ISEIM.2008.4664542
