The contact resistance force relationship of an intrinsically conducting polymer interface

Investigations on contact connector materials for different applications such as in the automotive industry have focused towards the increasing interest of using conducting polymers, as compared to conventional metallic contacts. The aim is to achieve overall improvements in performance as well as cost effectiveness. Currently, extrinsic conducting polymers (ECPs) are employed as conductive coats or adhesives at contact interfaces. However, frictional abrasion within the metal doped polymer (ECP) causes fretting corrosion, which leads to instability in the contact resistance. To overcome this, intrinsically conducting polymers (ICPs) are explored. Hemispherical contact coatings were fabricated using poly (3, 4-ethylenedioxythiopene) (PEDOT) or polyaniline/polyvinyl chloride (PANI/PVC) commodity blends. Contact resistances were taken using 4-wire resistance measurement techniques. The conductivities of in-house fabricated ICP contacts were found to be in the range of 10^-2 S.cm^-1. The response relating the change of contact resistance under varying compression force appeared to be repeatable with minimum deviation of 2%. The surface profiles of the ICP contacts were also recorded by an optical confocal system. The initial investigation results presented in this paper were used to evaluate and validate the hypothesis of employing ICP contacts to eliminate or minimize wearing and fretting effects.