Laccase-mediated in situ polymerization of pyrrole for simultaneous coloration and conduction of wool fabric

Abstract

Polypyrrole catalyzed by laccase appears as a black color in solution. Conductive fabric coated with polypyrrole could present a dark green color, but the colorimetric and dyeing properties have not been discussed. In this study, pyrrole was used for the dyeing of wool fabric through in situ polymerization using laccase. The absorbance of reaction solution increases as time goes on and a significant peak appears at 460 nm on the ultraviolet-visible spectrum. Scanning electron microscopy indicated polypyrrole catalyzed by laccase does fix onto the wool fiber comparing to the control sample. The structure and electrochemical activity of dyed wool fabric were characterized by Fourier transform infrared spectroscopy and cyclic voltammetry, respectively. The dyeing depth of the dyed wool fabrics increased gradually with the extension of time and increasing of concentration of laccase and pyrrole. The dyed wool fabric prepared presents good electrochemical activity in terms of in situ polymerization using laccase in solution.