Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects

Materials Research

Maria Angela De Moraes Cordeiro²  Débora Gonçalves¹  Luis Otavio De Sousa Bulhões¹  João Manuel Marques Cordeiro² 

[1] ,Universidade Estadual Paulista Faculdade de Engenharia de Ilha Solteira Departamento de Física e QuímicaIlha Solteira SP ,Brazil

关键词: poly-o-toluidine;    polymerization mechanism;    open-circuit potential;    polyaniline derivatives;   

DOI  :  10.1590/S1516-14392005000100003

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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