SPECTROSCOPIC PROPERTIES OF POLYANILINE PROTONATED WITH POLY(ALKYLENEPHOSPHATES)

The reaction of polyaniline with new high-molecular-weight protonating agents, namely poly(alkylene phosphates), has been studied by UV/vis spectroscopy. The spectra were recorded both in the solid state and in organic solvents since polyemeraldine protonated with poly(alkylene p hosphates) can be stabilized in the solution without precipitation. Th e influence of the molar ratio of both polymers and of the length of a lkylene chain on the protonation level was observed. The protonation w as evidenced by the appearance of polaron bands at 420 and ca. 900 nm. The addition of polar solvent increased the degree of,protonation. Th e best protonation was achieved in in-cresol solution, whose principal features were the appearance of intrachain (free carrier) excitation at 430 nm, the decrease of the ca. 800 nm band intensity, and the incr ease of a long absorption tail into the near-infrared.