Chemical synthesis and characterization of poly (pyrrole-co-o-aminophenol)/chitosan composite.

In this study, poly(pyrrole-co-o-aminophenol)/chitosan composite samples were synthesized by chemical method (as powder) in solutions of different molar ratios of pyrrole and o-aminophenol (8:2, 1:1 and 2:8). Composite samples were characterized by FT-IR (Fourier Transform Infrared), solubility tests, 1H-NMR (Nuclear Magnetic Resonance), DSC (Differential Scanning Calorimetry), CV (Cyclic Voltammetry) and SEM (Scanning Electron Microscope) images. As a results of the solubility test, it was observed that the solubility of the composite decreased as the pyrrole ratio increased. Also, the best solvents for composite samples determined as DMSO and DMF. When SEM images of copolymer and composite samples are examined, it is seen that the copolymer structure shows a structure in the form of regular small particles, while large nebula-shaped structures are formed after composite formation with chitosan. In addition, it was determined that the structures of the composite samples prepared in solutions containing different ratios of monomers differ from each other depending on the monomer ratios. According to DSC thermal analysis results of composite samples, it was concluded that the thermal stability of the composite samples having high pyrrole ratio (8:2) was better than the composite samples having low pyrrole ratio (1:1, 2:8). The electrochemical behavior of the composites was achieved by cyclic voltammetry technique. Electrochemical stability studies show that composite samples have good redox behavior, do not degrade during redox behavior, and are therefore very stable electrochemically. [ABSTRACT FROM AUTHOR]