Novel Electroactive Poly(arylene ether sulfone) Copolymers Containing Pendant Oligoaniline Groups: Synthesis and Properties

We present a series of novel poly(arylene ether sulfone) copolymers containing pendant oligoaniline groups. A novel monomer containing oligoaniline, 2,6-difluorobenzoyl aniline tetramer (DFAT), was synthesized by reaction of 2,6-difluorobenzoyl chloride and parent aniline tetramer and incorporated into the aforementioned copolymers via direct copolymerization with 4,4'-dichlorodiphenyl sulfone (DCDPS), and 4,4'-isopropylidene diphenol (BPA) using N,N'-dimethylacetamide as solvent. The structures of these copolymers were confirmed by FTIR, H-1 NMR, and GPC. Spectral analysis of the copolymers in different oxidation states was investigated via UV-visible spectra. The copolymers exhibited outstanding thermal stability and good solubility in various organic solvents. Their electroactivity, explored with cyclic voltammetry, was found to increase as the content of oligoaniline in the polymer increased. The electric and dielectric properties of the copolymers were also studied in detail. The electrochromic performance of the copolymers was investigated by electrochromic photographs and transmittance spectra; the color of the copolymer thin films changes from grey (at 0.0 V), to green (at 0.4 V), to blue (at 0.6 V) and to pearl blue (at 1.0 V) and the maximum transmittance change (Delta T) at 700 nm is 42.6% (90.7% <-> 48.1%). (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 1605-1614, 2011