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On the Properties of an Ion Conductive System Incorporated in Hybrid Films

Published online by Cambridge University Press:  01 February 2011

G. González ,
P. J. Retuert  and
S. Fuentes
G. González
Affiliation:
Departments of Chemistry, Faculty of Science, Universidad de Chile, Casilla 653. Santiago, Chile.
P. J. Retuert
Affiliation:
Faculty of Physical and Mathematical Science, Universidad de Chile, Casilla 2777. Santiago, Chile.
S. Fuentes
Affiliation:
Departments of Chemistry, Faculty of Science, Universidad de Chile, Casilla 653. Santiago, Chile.
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Abstract

Blending the biopolymer chitosan (CHI) with poly (aminopropilsiloxane) oligomers (pAPS), and poly (ethylene oxide) (PEO) in the presence of lithium perchlorate lead to ion conducting products whose conductivity depends on the composition of the mixture. A ternary phase diagram for mixtures containing 0.2 M LiClO4 shows a zone in which the physical properties of the products - transparent, flexible, mechanically robust films - indicate a high degree of molecular compatibilization of the components. Comparison of these films with binary CHI-pAPS nanocomposites as well as the microscopic aspect, thermal behavior, and X-ray diffraction pattern of the product with the composition PEO/CHI/pAPS/LiClO4 1:0.5:0.6:0.2 molar ratio indicates that these films may be described as a layered nanocomposite. In this composite, lithium species coordinated by PEO and pAPS should be inserted into chitosan layers. Electrochemical impedance spectroscopy measurements indicate the films are pure ionic conductors with a maximal bulk conductivity of 1.7*10-5 Scm-1 at 40 °C and a sample-electrode interface capacitance of about 1.2*10-9 F.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 628: Symposium CC – Hybrid Organic/Inorganic Materials , 2000 , CC6.1
Copyright
Copyright © Materials Research Society 2000

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