Thiophene ended epsilon-caprolactone conducting copolymers and their electrochromic properties

Kerman I., Toppare L., Yilmaz F., Yagci Y.

JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, no.4, pp.509-520, 2005 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2005
  • Doi Number: 10.1081/ma-200054363
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.509-520
  • Keywords: polypyrrole, polythiophene, poly-epsilon-caprolactone, electrochromism, conducting polymers, RING-OPENING POLYMERIZATION, POLY(METHYL METHACRYLATE), BLOCK-COPOLYMERS, POLYPYRROLE, POLYMERS, COMPOSITES, PYRROLE, DEVICES


epsilon-Caprolactone was polymerized by ring-opening polymerization (ROP), using thiophene methanol as the initiator and stannous octoate as the catalyst to yield poly(epsilon-caprolactone) with a thiophene end group. Homopolymerization of thiophene functionalized poly (epsilon-caprolactone) (PCL) was achieved by a constant current electrolysis method. Copolymerizations of PCL with thiophene and pyrrole were achieved in acetonitrile (ACN)-tetrabutylammonium tetrafluoroborate (TBAFB) solvent-electrolyte couple via constant potential electrolysis. Characterization of the samples were performed by nuclear magnetic resonance spectroscopy (NMR), cyclic voltammetry (CV), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy, (SEM). Electrical conductivities were measured by the four-probe technique. Spectroelectrochemical behavior of PCL/PTh film, which was deposited on ITO-glass, was investigated by UV-Vis Spectrophotometer. Furthermore, it is found to be an anodically coloring copolymer that electrochemically sit-itches between gray-blue oxidized state and pole red reduced state, exhibiting electrochromic behavior.