Electrogeneration of poly (2,5-di-(2-thienyl)-pyrrole) in acetonitrile. Kinetics, productivity and composition of the oxidized form

摘要

Poly(2,5-di-(2-thienyl)-pyrrole) (poly(SNS) was synthesized on a Pt electrode by flow of an anodic constant current density of 0.5 mA cm~-2 through a solution containing the monomer SNS and LiClO_4 in acetonitrile. The obtained polymer weight was followed by 'ex situ' ultramicrogravimetry. Kinetics were followed as a function of temperature, monomer concentration and electrolyte concentration. Two different kinetic regions were found at lower or greater polarization times than 100 s. Productivities of the polymerization charge (as mg of polymer produced per mC of consumed charge), composition (by elemental analysis) and the subsequent number of electrons required to incorporate a monomeric unit into the polymer were determined from different samples.