Synthesis of conducting polymers of terepthalic acid bis-(2-thiophen-3-yl-ethyl)ester and investigation of their electrochromic properties

Coşkun, Yelda
Terepthalic acid bis-(2-thiophen-3-yl-ethyl)ester (TATE) was synthesized through the reaction of 2-thiophen-3-yl-ethanol and terepthaloyl chloride. Electrochemical behavior of the TATE and TATE in the presence of thiophene were studied by cyclic voltammetry (CV). The chemical structure of monomer is characterized via Nuclear Magnetic Resonance Spectroscopy (NMR) and Fourier Transform Infrared Spectroscopy (FTIR). Homopolymer of TATE was synthesized by galvanostatic and potentiostatic methods, and copolymerization of TATE with thiophene was achieved via potentiostatic method. Both homopolymer (PTATE) and copolymer [P(TATE-co-Th)] were characterized by various techniques including cyclic voltammetry, FTIR, Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermal Gravimetry Analysis (TGA) and UV-VIS Spectrophotometer. Conductivities of samples were measured by four probe technique. Electronic band gap of polymers measured as the onset of the p-p* transition using spectroelectrochemical analysis and colorimetry studies were investigated. Dual type polymer electrochromic devices (ECDs) based on PTATE, P(TATE-co-Th) and poly(3,4-ethylenedioxythiophene) (PEDOT) have been constructed. Spectroelectrochemistry, switching ability and stability of the devices were investigated by UV-Vis Spectrophotometer and Cyclic Voltammetry.


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Copolymer of aniline and triethylene glycol bis(o-aminophenyl) ether was synthesized by constant potential electrolysis. Cyclic voltammogram of the copolymer films recorded in the monomer-free electrolytic solution revealed that the redox behavior of the films approaches to that of poly(triethylene glycol bis(o-aminophenyl) ether) with increasing amount of triethylene glycol bis(o-aminophenyl) in the feed ratio. Copolymerization was investigated by in situ recording the changes in the electronic absorption ...
Citation Formats
Y. Coşkun, “Synthesis of conducting polymers of terepthalic acid bis-(2-thiophen-3-yl-ethyl)ester and investigation of their electrochromic properties,” M.S. - Master of Science, Middle East Technical University, 2004.