Abstract: This invention involves a process for manufacturing high molecular mass polyaniline in the form of emeraldine and polyaniline obtained by this process. The process includes the following steps: a) polymerising aniline or an aniline derivative to make pernigraniline by doing the polymerization in a homogeneous aqueous solution including the aniline or the aniline derivative, a protonic acid, a salt, an oxidizing agent and ethanol to yield pernigraniline, b) reducing the pernigraniline obtained in step a) to emeraldine by means of an aqueous reducing solution which does not contain aniline, and possibly an additional step of extraction and post-polymerisation with chloroform. The polyanilines thus protonated by (±)-10-camphor sulphonic acid are totally soluble in m-cresol and in hexafluoroisopropanol and produce flexible films with high electrical conductivity, i.e. 250-350 S/cm.

Abstract: The invention concerns compositions for manufacturing composite materials containing a polyaniline. These compositions are formed by a solution in a solvent such as m-cresol of the following constituents: a) a conductive polyaniline protonated by means of a protonation agent able to promote the dissolution of the polyaniline in the solvent, for example phenylphosphonic acid, b) an insulating polymer chosen for example from amongst the cellulosic polymers and polyvinyl chlorides such as cellulose acetate, and c) an insulating plasticiser such as a mixture of dimethyl phthalate, diethyl phthalate and triphenyl phosphate. By pouring this solution and evaporating the solvent, it is possible to obtain a flexible film of conductive composite material having good electrical and mechanical properties.