FTIR studies of chitosan acetate based polymer electrolytes

Osman, Z. and Arof, Abdul Kariem (2003) FTIR studies of chitosan acetate based polymer electrolytes. Electrochimica Acta, 48 (8). pp. 993-999. ISSN 0013-4686

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Official URL: https://doi.org/10.1016/S0013-4686(02)00812-5

Abstract

Chitosan is the product when partially deacetylated chitin dissolves in dilute acetic acid. As such, depending on the degree of deacetylation, the carbonyl, C=O-NHR band can be observed at similar to1670 cm(-1) and the amine, NH2 band at 1590 cm(-1). When lithium triflate is added to chitosan to form a film of chitosan acetate-salt complex, the bands assigned to chitosan in the complex and the spectrum as a whole shift to lower wavenumbers. The carbonyl. band is observed to shift to as low as 1645 cm and the amine band to as low as 1560 cm(-1). These indicate chitosan-salt interactions. Also present are the bands due to lithium triflate i.e. similar to761, 1033, 1182 and 1263 cm(-1). When chitosan and ethylene carbonate (EC) are dissolved in acetic acid to form a film of plasticized chitosan acetate, the bands in the infrared spectrum of the films do not show any significant shift indicating that EC does not interact with chitosan. EC-LiCF3SO3 interactions are indicated by the shifting of the C=O bending band from 718 cm(-1) in the spectrum of EC to 725 cm(-1) in the EC-salt spectrum. The Li+-EC is also evident in the ring breathing region at 893 cm(-1) in the pure EC spectrum. This band has shifted to 898 cm(-1) in the EC-salt spectrum. C=O stretching in the doublet observed at 1774 and 1803 cm(-1) in the spectrum of pure EC has shifted to 1777 and 1808 cm(-1) in the EC-salt spectrum. (C) 2002 Elsevier Science Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: FTIR, chitosan, ethylene carbonate, lithium triflate, acetic acid, ion-pairs, complexes, films, salt, spectroscopy, temperature, derivatives, triflate, ethylene, liclo4,
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: miss munirah saadom
Date Deposited: 09 Oct 2013 08:15
Last Modified: 04 Oct 2018 06:39
URI: http://eprints.um.edu.my/id/eprint/8478

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