Chemical oxidative synthesis and characteristion of organica acid doped soluble conducting poly(o-anisidine)
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Date
2009
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Publishing House of Lviv Polytechnic National University
Abstract
Synthesis of poly(o-anisidine) with and without acrylic acid doping is carried out by chemical oxidative polymerizationmethod. This is a new polymerizationmethod
for the direct synthesis of the emeraldine salt of poly(oanisidine), i.e. it is directly soluble in known organic solvent
such as m-cresol, N-methyl pyrrolidone (NMP), DMSO,
DMF, etc. without the need for a conversion of salt phase
to base form. The reaction is unique since it eliminates the
post processing step which involves neutralization of
emeraldine salt to form emeraldine base and again
reprotonating the base with a secondary protonic acid. The acrylic acid doped polymer prepared using tartaric
acid is comparatively more soluble in m-cresol and NMP
than the poly(o-anisidine) prepared without acrylic acid.
UV-visible spectra for acrylic acid doped poly(o-anisidine)
reveals the coil conformation at higher wavelength ~800–
1000 nm along with sharp peak ~440 nm, which may be
attributed to secondary doping due to extended coil conformation. Whereas in the presence of NMP as a
solvent, the extended tail at higher wavelength disappears
while a sharp peak (~630 nm) is observed representing
the polymer insulting emeraldine base form. This fact confirms the effect of the solvent on the polymer properties. This is further manifested by the FT-IR spectral studies. Broad and intense band at ~3300–3200cm–1 and
1100–1200 cm–1 in acrylic acid doped polymer accounts
for higher degree of doping. The conductivity of acrylic
acid doped poly(o-anisidine) is greater than poly(oanisidine)
without acrylic acid. The change in resistance of tartaric acid doped poly(o-anisidine) prepared in acrylic acid media upon its exposure to ammonia vapor suggests the applicability of these polymericmaterials for ammonia. Методом хімічної оксидаційної полімеризації синтезовано полі(о-анізидин) з додаванням та без акрилової кислоти. Запропонований метод розроблений для безпосереднього синтезу емеральдинової солі полі(о-анізидину), розчиненої у загальновідомих органічних розчинниках, зокрема в м-крезолі, N-метилпіролідоні, диметилсульфоксиді та ін., без необхідності перетворення солевої фази в основну форму. Показана залежність стійкості полімеру, модифікованого винною кислотою і приготовленого в середовищі акрилової кислоти, до дії парів амонію.
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Keywords
poly(o-ansidine), solubility, conductivity, acrylic acid dopant, полі(о-анізидин), розчинність, провідність, акрилова кислота
Citation
Chabukswar V. Chemical oxidative synthesis and characteristion of organica acid doped soluble conducting poly(o-anisidine) / Vasant Chabukswar, Ganesh Sable // Chemistry & Chemical Technology. – 2009. – Volume 3, number 2. – P. 95–99. – Bibliography: 20 titles.