Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 35, Issue 10, Pages 1068-1075Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/35/10/316
Keywords
-
Categories
Ask authors/readers for more resources
The ac electrical properties of acetylene black composites mixed into ethylene butylacrylate copolymer (EBA) and into poly (methyl methacrylate) (PMMA) have been measured in thermal cycling and isothermal annealing experiments. The results show that changes in electrical properties are due to rearrangement of gaps between the carbon black aaarecates. This has been concluded using an exponent z that relates the critical frequency w(c), denoting the crossover of the conductivity from the dc-plateau to its frequency-dependent part to the dc conductivity, sigma(dc). according to w(c) infinity sigma(dc) Below the melting ran-e of EBA and the glass transition of PMMA z is about one corresponding to strong variation of the conductivity and weak dependence of the permittivity on the gaps. Above the melting range of EBA z is about 1.5, indicating strong dependence of both the conductivity and the permittivity on the gaps, as predicted by percolation theory. This was not found In the PMMA composites above the glass transition. We conclude that the polymer matrix affects the nature of the gaps between carbon black aggregates, either allowing their size to vary continuously (z about 1) or letting them open and close (z about 1.5).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available