Structure of polyaniline formed in different inorganic porous materials: A spectroscopic study |
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Authors: | Gustavo M. do Nascimento Marcia L.A. Temperini |
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Affiliation: | Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, CP 26.077, CEP 05513-970, São Paulo, SP, Brazil |
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Abstract: | In this work, the electronic and structural characterization of polyaniline (PANI) formed in cavities of zeolites Y (ZY) and Mordenite (MOR) and montmorillonite (MMT) clay having Cu(II) as oxidant agent are presented. The formation of PANI and its structure is analyzed by Resonance Raman, UV-Vis-NIR, FT-IR and N K XANES techniques. In all cases the structure of PANI formed is different from the “free” polymer. The presence of azo bonds linked to phenazine-like rings are observed only for PANI-MMT composites, independent of the kind of oxidant agent employed in the synthesis. The presence of Cu(II) ions leads to the formation of Phenosafranine-like rings. The presence of these phenazine-like rings in the structure of confined PANI chains can also contribute to the enhancement of the thermal stability observed for all composites. |
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Keywords: | Polyaniline Raman spectroscopy Montmorillonite Zeolites |
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