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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Pressure-Induced Reactivity in the Emeraldine Salt and Base Forms of Polyaniline Probed by FTIR and Raman

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Author(s):
Nobrega, Marcelo M. [1, 2] ; Ceppatelli, Matteo [2, 3] ; Temperini, Marcia L. A. [1] ; Bini, Roberto [2, 4]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05513970 Sao Paulo - Brazil
[2] European Lab Nonlinear Spect, LENS, I-50019 Sesto Fiorentino, FI - Italy
[3] Natl Res Council Italy, Inst Chem OrganoMetall Cpds, ICCOM CNR, I-50019 Florence - Italy
[4] Univ Florence, Dipartimento Chim Ugo Schiff, I-50019 Sesto Fiorentino, FI - Italy
Total Affiliations: 4
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 118, n. 47, p. 27559-27566, NOV 27 2014.
Web of Science Citations: 12
Abstract

This report presents the influence of the morphology on the pressure-induced reactivity of the doped (PANI-ES) and dedoped (PANI-EB) forms of polyaniline using Raman and FTIR techniques. Our PANI-EB FTIR spectroscopy data showed an intensity exchange among characteristic bands of the quinoid and benzoic segments above 9 GPa, suggesting a specific coupling reaction between adjacent quinoid rings. The reaction kinetic was followed, and the results showed a dependence of the rate constant with pressure, as well as the activation volume, presented an inversion from negative to positive at 13 GPa, suggesting that steric factors have a role in the reactivity of the species. Raman spectra of PANI-ES showed a broadening and a blue shift of the bands as the pressure increases preceding the almost complete amorphization of the polymer; after decompression, some minor spectral changes were observed, suggesting the occurrence of the dedoping and cross-linking reactions in less extension than PANI-EB. (AU)

FAPESP's process: 10/18107-8 - Study of the structures of PANI nanofibers and their hybrids with metallic nanostructures by Raman epectroscopy
Grantee:Marcelo Medre Nobrega
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 13/05983-2 - Study of the structural behavior of the emeraldine salt and base forms of polyaniline with bulk and fibers morphology under high pressure
Grantee:Marcelo Medre Nobrega
Support Opportunities: Scholarships abroad - Research Internship - Doctorate