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    Title: Characterization and conversion determination of stable PEDOT latex nanoparticles synthesized by emulsion polymerization
    Authors: Wu, Chieh-Han;Don, Trong-Ming;Chiu, Wen-Yen
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Emulsion polymerization;Bi-oxidant Fe(OTs)3/H2O2 system;Conversion determination
    Date: 2011-03
    Issue Date: 2011-09-28 11:48:31 (UTC+8)
    Publisher: London: Elsevier Ltd
    Abstract: In this research, poly(3,4-ethylenedioxythiophene) (PEDOT) latex nanoparticles with good colloidal stability were prepared by emulsion polymerization and the conversions of EDOT were determined. Two kinds of oxidants, Iron(III) p-toluenesulfonate Fe(OTs)3 and hydrogen peroxide H2O2, were introduced to decrease the use of iron salt and therefore reduce the particle coagulation. The ferrous ions (Fe2+) produced during the polymerization would be re-oxidized back to the reactive ferric ions (Fe3+) with the help of H2O2. This cyclic oxidation–reduction process resulted in the sustained regeneration of Fe3+ ions and led to a higher conversion. A dark blue PEDOT latex with long-term dispersion stability was obtained when Fe(OTs)3 and H2O2 were added in sequence. The results obtained from dynamic light scattering and TEM measurements showed that the sizes of nanoparticles were around 100 nm. To determine the conversion of EDOT, two methods (gravimetric analysis and UV–visible method) were used and compared. For the first time, the UV–visible method was established to quantitatively determine the conversion of EDOT monomer. From the measurement, the conversion of EDOT in this system was determined as 74–75%. The PEDOT film prepared by drying the latex solution had conductivity up to 6.3 S/cm.
    Relation: Polymer 52(6), pp.1375-1384
    DOI: 10.1016/j.polymer.2011.01.034
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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