Synthesis and properties of multifunctional poly(amic acid) with oligoaniline and fluorene groups

A novel multifunctional poly(amic acid) bearing oligoaniline, fluorene groups (PAAOF) has been prepared through the one-step synthetic route. The structure of PAAOF was confirmed via nuclear magnetic resonance (NMR), Fourier-transform infrared spectra (FTIR), and gel permeation chromatography (GPC). Moreover, the electrochemical measurement results revealed that PAAOF material have an expected electrochemical activity, and good electrochromic properties with high contrast value and satisfactory coloration efficiency. The photophysical properties of the as-synthesized PAAOF at various oxidation states were studied. The results indicated that the fluorescence of PAAOF could be tuned by modulating the oxidation states of oligoaniline segments. In the fluorescence tuning, the fluorene groups are fluorophore, and the oligoaniline segments are used as regulatory unit.