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    Both anodically and cathodically coloring electrochromic polymer based on dithieno[3,4-b,3?,4?-e]-[1,4]-dithiine
    (Elsevier Science Sa, 2006) Sahin, E; Camurlu, P; Toppare, L
    In this study poly(dithieno[3,4-b,3',4'-e]-[1,4]-dithiine) (PDTH) was synthesized potentiodynamically in both p- and n-doping domains in 0.1 M tetrabutylammonium tetrafluoroborate/acetonitrie/borontrifluoride ethylether (8:2, v/v). Resulting homopolymer was characterized via cyclic voltammetry, FTIR and UV-vis Spectroscopy. PDTH revealed both anodically and cathodically coloring electrochromic behavior, upon p-and n-doping, respectively. Spectroelectrochemistry analysis of p-doped polymer, reflected electronic transitions at 450-486, 766 and similar to 900nm, revealing pi-pi degrees transition, polaron and bipolaron band formation, respectively. As an anodically coloring material, polymer revealed multi-color electrochromism, exhibiting brick, green and light gray colors. As the cathodically coloring material, color varied between highly transmissive and brown, as such this material exhibits potential controllable states. Switching ability of the polymer was also investigated by a kinetic study upon measuring the %T at the maximum contrast point. Results showed that PDTH is a potential material for electrochromic devices both as anodically and cathodically coloring material. (c) 2005 Elsevier B.V All rights reserved.
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    Conducting copolymers of thiophene functionalized polystyrenes with thiophene
    (Elsevier Science Sa, 2005) Sahin, E; Camurlu, P; Toppare, L; Mercore, VM; Cianga, I; Yagci, Y
    Thiophene capped polystyrenes (TCP1, TCP2) were synthesized by atom transfer radical polymerization of styrene followed by Suzuki condensation with 2-thiophene boronic acid. Electrically conducting graft polymers of TCP1 and TCP2 with thiophene were achieved by electrochemical methods. Characterization of the graft polymers were performed by cyclic voltammetry (CV), Fourier transform infrared spectroscopy, differential scanning calorimetry, scanning electron microscopy analyses. Electrochromic properties of the conducting copolymers were investigated by spectroelectrochemistry, kinetic and colorimetry studies. The observed lambda(max) and band gap values were found to be at 432 nm, 2.10 eV and 453 nm, 2.13 eV for P(TCP1 -co-Th) and P(TCP2-co-Th), respectively. Also, we successfully established the utilization of dual-type complementary colored polymer electrochromic devices using P(TCP I co-Th)/poly(3,4-ethylenedioxythiophene) (PEDOT) in sandwich configuration. The switching ability, stability and optical memory of the electrochromic device were investigated with UV-Vis spectrophotometer and CV. P(TCP1-co-Th)/PEDOT switches between blue and brown. (c) 2005 Elsevier B.V. All rights reserved.