Publication: Synthesis and characterization of poly-o-toluidine: Kinetic and structural aspects
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Undergraduate course
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Acesso aberto
Abstract
Poly(o-methylaniline) (poly-o-toluidine, PTOL) was synthesized by chemical oxidation of o-toluidine with ammonium peroxydisulfate in an aqueous 1.0 mol L -1 HCl solution. The progress of polymerization was followed by measuring the open-circuit potential (OCP) of a Pt electrode immersed in the reaction medium with the polymerization time. The chemical synthesis of PTOL was carried out at different monomer:oxidant (M:O) molar ratios (4:1, 2:1, 1.5:1, 1:1, and 0.66:1), and the products obtained were characterized by infrared spectroscopy, gel permeation chromatography, and X-ray diffraction. The molecular weight and percentage of crystallinity of PTOL are higher for samples synthesized in an excess of the monomer, i.e. at higher M:O ratios. However, the yield of PTOL prepared at higher M:O ratios is considerably low, in particular at a 4:1 M:O ratio, which is the M:O ratio most commonly used in the literature to synthesize polyaniline and its derivatives.
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Keywords
Open-circuit potential, Poly-o-toluidine, Polyaniline derivatives, Polymerization mechanism, Characterization, Electrodes, Molecular structure, Polymerization, Reaction kinetics, Synthesis (chemical), Nitrogen compounds
Language
English
Citation
Materials Research, v. 8, n. 1, p. 5-10, 2005.
