Abstract
Three different compositions of EPDM, polyaniline (PANI) and carbon black have been studied with respect to conduction properties. It could be concluded that both carbon black and polyaniline influence the low field conductivity. In addition, the influence of different conduction mechanisms was studied. Measurements on the temperature dependence of the electrical conductivity indicated that large amount of polyaniline in EPDM rubber manifested in 1D variable range hopping (1D-VRH) behavior whereas less amount, although still well above the percolation threshold, resulted in behavior more similar to the Arrhenius law. However, further studies are necessary to draw definitive conclusions on the influence of filler content. Studying the field dependent conductivity behavior it could be concluded that there is a Ohmic region at low field and a transition towards space charge limited current (SCLC) at higher field with possible influence of other conduction mechanisms.
Highlights
Applications which have been mentioned are semiconducting layers in cables as well as filler in polypropylene films used in power capacitors [3,4,5,6]
The influence of different amount of polyaniline in an EPDM matrix as well as the addition of carbon black has been studied with respect to conduction behavior
Looking at the low field conductivity of the compositions studied here it can be seen that the addition of carbon black or higher amount of polyaniline will increase the low field conductivity (Table 2). This can be related to another study [11] where a clear log-linear relationship between conductivity and amount of carbon black was observed whereas the influence of increasing amount of polyaniline is more ambiguous
Summary
Applications which have been mentioned are semiconducting layers in cables as well as filler in polypropylene films used in power capacitors [3,4,5,6]. The influence of different amount of polyaniline in an EPDM matrix as well as the addition of carbon black has been studied with respect to conduction behavior. This can be related to another study [11] where a clear log-linear relationship between conductivity and amount of carbon black was observed whereas the influence of increasing amount of polyaniline is more ambiguous.
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