ELECTRICAL-TRANSPORT PROPERTIES OF MOLECULAR COMPOSITES DERIVED FROM THE OXIDATION OF POLY(N-VINYLPYRROLE)

Homo and copolymers of N-vinylpyrrole (NVP) were synthesized and the s tructure/properties relationships of the chemical oxidation products w ith FeCl3 at different Fe3+/NVP molar ratios characterized. From DC el ectrical, FT-IR and Raman spectroscopic characterizations, the picture of a composite at a molecular level emerges as that of a block copoly mer of non-conducting and conducting segments, these last derived from the oxidation of PNVP. The possibility of giving an estimate of the g rowth of the oxidation level is seen from FT-IR data, whereas Raman sp ectroscopy seems to be specifically sensible to the modifications indu ced by the oxidation in the NIR-Vis absorption, probably coupled to th e enhancement of the conduction process. The transport properties are analyzed according to the hopping model and the result of fitting proc edures discussed.