ANODIC ELECTROSYNTHESIS AND CATHODIC ELECTRODISSOLUTION OF POLY(2,5-DI-(2-THIENYL)PYRROLE) - A NEW WAY OF PROCESSIBILITY

Poly(2,5-di-(2-thienyl)pyrrole) was electrogenerated at constant curre nt from acetonitrile solutions. The weight of the obtained polymer fil m was followed by 'ex situ' ultramicrogravimetry. One electron was con sumed to incorporate each new monomeric unit to the oxidized polymer f ilm. The polymerization process takes place through alpha-alpha' posit ions preferentially, as was deduced from FT-IR experiments. The electr ogenerated polymer film is soluble in methanol, acetone, THF and other organic solvents, partially soluble in acetonitrile and insoluble in LiClO4 acetonitrile solutions. The electrochemically reduced polymer i s soluble in LiClO4 acetonitrile solution. The weight of solved polyme r is proportional to the electrical charge consumed during the reducti on process. The solubility is completed when one electron is injected to the polymer every 3.3 monomeric units present in the polymer. The s olution of the most oxidized polymeric state evolves to more reduced s tates as was followed by UV-Vis spectroscopy.