Evaluation of the doping process of polyaniline produced inside the mesopores of a sulfonic acid grafted MCM-41

Evaluation of the doping process of polyaniline produced inside the mesopores of a sulfonic acid grafted MCM-41

Author Fonseca, Leandro C. Autor UNIFESP Google Scholar
Faez, Roselena Autor UNIFESP Google Scholar
Camilo, Fernanda F. Autor UNIFESP Google Scholar
Bizeto, Marcos A. Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract The use of mesoporous materials as hosts for polymers production in a confined environment is a field of great interest, especially in the case of conducting polymers. This method provides size and morphological control in nanoscopic scale and permits the formation of polymeric chains with good linearity and fewer defects, characteristics that could promote enhanced electrical conductivity.In this study it was evaluated some aspects of the polymerization of aniline inside the pores of the MCM-41 silica post-modified with sulfonic acid groups (-SO3H) covalently bonded to the surfaces. the produced hybrid material containing polyaniline (PAni) into the pores was characterized by X-ray diffractometry, thermogravimetric analysis, UV-Vis electronic absorption, Fourier transformed infrared spectroscopies and scanning and transmission electron microscopies.The results indicate that PAni was successfully generated inside the pores of the sulfonic acid grafted MCM-41 and that the acid group was capable of protonating the polymer, producing PAni in the emeraldine salt state, the most conductive one, without the addition of another acid source during the polymerization step. the grafted sulfonic acid groups also promoted a stronger interaction between inorganic matrix and aniline than the observed in non-functionalized MCM-41, which resulted in less monomer and polymer lixiviation during the polymerization step. (C) 2012 Elsevier Inc. All rights reserved.
Keywords Mesoporous silica
Polyaniline
Sulfonic acid post-grafting
In situ polymerization
Hybrid nanomaterial
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Date 2012-09-01
Published in Microporous and Mesoporous Materials. Amsterdam: Elsevier B.V., v. 159, p. 24-29, 2012.
ISSN 1387-1811 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 24-29
Origin http://dx.doi.org/10.1016/j.micromeso.2012.04.006
Access rights Closed access
Type Article
Web of Science ID WOS:000305917700004
URI http://repositorio.unifesp.br/handle/11600/35232

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