Preparation of novel fluoroalkyl end-capped oligomers/polyaniline and/ N,N′ -diphenyl-1,4-phenylenediamine nanocomposites

Fluoroalkyl end-capped acrylic acid oligomer [RF-(ACA)n-RF]/, 2-(methacryloyloxy)ethanesulfonic acid oligomer [RF-(MES)n-RF]/, 2-acrylamido-2-methylpropanesulfonic acid oligomer [RF-(AMPS)n-RF]/polyaniline [PAn] nanocomposites were prepared by the polymerization of aniline initiated by ammonium persulfate in the presence of the corresponding oligomers, respectively. These fluorinated oligomers were also applied to the preparation of the corresponding fluorinated oligomers/phenyl-capped aniline dimer (An-dimer: N,N′-diphenyl-1,4-phenylenediamine) nanocomposites by the interaction of the fluorinated oligomers with An-dimer. These fluorinated composites thus obtained were found to afford nanometer size-controlled fine particles possessing a good dispersibility and stability in water and traditional organic media such as methanol. UV–vis spectra of RF-(MES)n-RF/PAn nanocomposites and RF-(AMPS)n-RF/PAn nanocomposites showed the similar absorption peaks around 350, 430, and 780 nm to those of the usual Bronsted acid-doped PAn; however, interestingly, RF-(ACA)n-RF/PAn nanocomposites were found to exhibit only an absorption peak around 430 nm based on the polaron transition.