Title :
Effect of elongation on the electrical properties and morphology of polypropylene
Author :
Yi, Dong-Young ; Hwangbo, Seung ; Park, Dac-Hcc ; Han, Min-Koo
Author_Institution :
Dept. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
Variations of electrical properties of polypropylene film due to elongation have been investigated. The conductivities of PP films have been decreased with the increase of elongation ratio (λ) and the activation energy (φ) of elongated PP films were slightly higher than that of nonelongated PP film. From TSC experimental data, we have found, in the elongated PP films (λ=6, 8), that trap density shows a slight increase trend with the increase of elongation ratio for peak P1, but trap density for second P2 decrease largely in the elongated samples. We have also observed the increase of AC breakdown strength with the increase of elongation ratio. We conclude that the decrease of conductivity and increase of dielectric strength with elongation originate from the increase of trap density and trap depth for TSC peak P1, and also may be attributed to the dominance of dipolar process at room temperature
Keywords :
electric breakdown; electric strength; electrical conductivity; elongation; organic insulating materials; polymer films; thermally stimulated currents; AC breakdown strength; activation energy; conductivity; dipolar process dominance; electrical properties; electrical properties elongation; polypropylene morphology; thermally stimulated currents; trap density; trap depth; Conductive films; Conductivity; Current measurement; Dielectric breakdown; Electric variables measurement; Mechanical factors; Morphology; Pollution measurement; Power capacitors; Temperature;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549398
