Electric current arising from unpolarized polyvinyl formal

摘要

An appreciable electric current is observed in a system consisting of a polyvinyl formal (PVF) film in a sandwich configuration, in the temperature range 30-110 deg C. The maximum value of the current during first heating is found to be of the order of 10~(-10) A and its thermograms exhibit one transition (i.e. current peak) at around 600C. The position of the current peak in thermal spectrum shifts with the heating rate. A temperature- dependence of the open circuit voltage is also observed. The activation energy of the process responsible for the current is determined. The magnitude of the current is more in the case of dissimilar electrode systems. It is proposed that the electric current arising from unpolarized metal-polymer-metal system is a water activated phenomenon, which is influenced by the transitional changes of the polymer.