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| Author(s): |
Daniela Colevati Ferreira
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
| Defense date: | 2010-12-03 |
| Examining board members: |
Marcia Laudelina Arruda Temperini;
Susana Ines Cordoba de Torresi;
Everaldo Carlos Venancio
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| Advisor: | Marcia Laudelina Arruda Temperini |
| Abstract | |
In this work it was performed the spectroscopic study (UV-VIS-NIR, FTIR, Raman e NMR) of the polymerization products of aniline and ammonium persulfate using different reaction conditions in relation to the standard polyaniline synthesis (initial pH = 1). The reaction was performed in HCl medium (initial pH =3) and in buffered medium (pH = 3) In the first case it was observed the major formation of aniline oligomers with head-to-tail coupling, while in buffered medium macromolecules with 1,4 Michael-type segments between aniline and benzoquinone monoimine with different hydrolysis/oxidation ratio of iminic groups are formed, in addition to phenazine-like units. This characterization is in accordance to the distinct proposals of two groups (Surwade et al. e Stejskal et al.), which at first seemed contradictory. Again, relative to the products obtained in buffered solution (pH = 3), it is observed the formation of microspheres whose diameter range is 3-7 µm. The use of Raman microscopy and resonance Raman spectroscopy revealed a correlation between phenazine-like structure and the microspheres formation. (AU) | |