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- W1975274311 abstract "Electrochemical polymerization of aniline was conducted in constant current mode at different pH ranging from 0.2 to 3.7 in an ITO glass electrode-quartz cell assembly for in situ monitoring of the changes in potential, amount of charge passed through, and u.v.-visible absorption (u.v.-Vis) spectra during polymerization. u.v.-Vis spectra of product polyaniline (PAn) films were determined in different pH solutions to evaluate the apparent acid dissociation constants (pKa)app from plots of log{(AbsHAX − Absobs)(Absobs − AbsA) versus pH, where Absobs, AbsHAX, and AbsA are the observed absorption strength and those of the fully protonated and deprotonated species, respectively, for a given wavelength light. In PAn films prepared at low pH (< 1.0), emeraldine form PAn chains with relatively long average conjugation length but broad distribution were produced, while in those prepared at high pH (> 1.5), PAn chains with short conjugation length were produced and later deteriorated as the polymerization proceeded, because the polymerization potential eventually exceeded a critical value (+ 0.8 V) beyond which degradation of produced PAn chains took place." @default.
- W1975274311 created "2016-06-24" @default.
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- W1975274311 date "1998-01-01" @default.
- W1975274311 modified "2023-09-29" @default.
- W1975274311 title "Structure and properties of polyaniline films prepared via electrochemical polymerization. I: Effect of pH in electrochemical polymerization media on the primary structure and acid dissociation constant of product polyaniline films" @default.
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- W1975274311 doi "https://doi.org/10.1016/s0032-3861(98)00013-5" @default.
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