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Synthesis and characterization of conducting copolymers from aniline and o ‐anisidine in HCl solutions
Author(s) -
Rehan HH,
AlMazroa SH,
AlFawzan FF
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1132
Subject(s) - aniline , polyaniline , polymerization , copolymer , polymer chemistry , cyclic voltammetry , materials science , conductive polymer , polymer , autocatalysis , chemistry , organic chemistry , electrochemistry , electrode , catalysis
Conducting poly(aniline‐ co‐o ‐anisidine) (PAS) films with different ratios of aniline units in the polymer chain were prepared by oxidative polymerization of different molar ratios of aniline and o ‐anisidine in 1 M HCl using cyclic voltammetry. Due to the much higher reactivity of o ‐anisidine, the structure and properties of PASs were found to be dominated by the o ‐anisidine units. The polymerization of poly‐ o ‐anisidine and PASs followed zero‐order kinetics with respect to formation of the polymer (film thickness) and the autocatalytic polymerization of aniline was completely inhibited. In contrast to polyaniline, a decrease in the polymerization temperature was found to increase the amount of copolymer formed and its redox charge. The presence of aniline units in PASs led to a pronounced increase in the molecular weight and conductivity, and a decrease in the solubility in organic solvents. Repetitive charging/discharging cycles showed that PASs resist degradation more than polyaniline. Copyright © 2003 Society of Chemical Industry