Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects
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 reacti...
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2005-03-01
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doaj-41220283bd55445eb7447a2325948b5b2020-11-24T23:20:53ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392005-03-018151010.1590/S1516-14392005000100003Synthesis and characterization of poly-o-toluidine: kinetic and structural aspectsMaria Angela de Moraes CordeiroDébora GonçalvesLuis Otavio de Sousa BulhõesJoão Manuel Marques CordeiroPoly(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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000100003poly-o-toluidinepolymerization mechanismopen-circuit potentialpolyaniline derivatives |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Maria Angela de Moraes Cordeiro Débora Gonçalves Luis Otavio de Sousa Bulhões João Manuel Marques Cordeiro |
spellingShingle |
Maria Angela de Moraes Cordeiro Débora Gonçalves Luis Otavio de Sousa Bulhões João Manuel Marques Cordeiro Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects Materials Research poly-o-toluidine polymerization mechanism open-circuit potential polyaniline derivatives |
author_facet |
Maria Angela de Moraes Cordeiro Débora Gonçalves Luis Otavio de Sousa Bulhões João Manuel Marques Cordeiro |
author_sort |
Maria Angela de Moraes Cordeiro |
title |
Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects |
title_short |
Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects |
title_full |
Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects |
title_fullStr |
Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects |
title_full_unstemmed |
Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects |
title_sort |
synthesis and characterization of poly-o-toluidine: kinetic and structural aspects |
publisher |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
series |
Materials Research |
issn |
1516-1439 |
publishDate |
2005-03-01 |
description |
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. |
topic |
poly-o-toluidine polymerization mechanism open-circuit potential polyaniline derivatives |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000100003 |
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