Abstract
It has been demonstrated that the electrical conductivity of a composite film consisting of heat‐treated poly(anthranilic acid) (PANA) and poly(vinyl alcohol) is linearly related to the 
concentration. Heat‐treatment of PANA at elevated temperature led to the elimination of carboxyl groups, and to the formation of base‐type polyaniline (PAn). The increase in conductivity of the composite film in proportion to the 
concentration is attributed to the transfomation of the insulating base‐type PAn to the conducting salt‐type which is caused by the incorporation of carbonate ions formed by the hydrolysis of 
into the base‐type PAn. ©1999 The Electrochemical Society