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Preparation, Characterization and Properties of New Ion-Conducting Ormolytes

Published online by Cambridge University Press:  10 February 2011

K. Dahmouche ,
M. Atik ,
N. C. Mello ,
T. J. Bonagamba ,
H. Panepucci ,
M. Aegerter  and
P. Judeinstein
K. Dahmouche
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo,CP 369, 13560-970, São Carlos-SP (Brazil)
M. Atik
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo,CP 369, 13560-970, São Carlos-SP (Brazil)
N. C. Mello
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo,CP 369, 13560-970, São Carlos-SP (Brazil)
T. J. Bonagamba
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo,CP 369, 13560-970, São Carlos-SP (Brazil)
H. Panepucci
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo,CP 369, 13560-970, São Carlos-SP (Brazil)
M. Aegerter
Affiliation:
Institut für Neue Materialen (INM), Im Stadtwald, Gebädude 43, D 66123, Saarbrücken (Germany)
P. Judeinstein
Affiliation:
Laboratoire de Chimie Structurale Organique, URA CNRS 1384, Université Paris-sud, 91405 Orsay (France)
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Abstract

Two families of hybrid organic-inorganic composites exhibiting ionic conduction properties, so called ORMOLYTES (organically modified electrolytes), have been prepared by the sol-gel process. The first family has been prepared from a mixture of 3-isocyanatopropyltriethoxysilane (IsoTrEOS), O,O′ Bis (2-aminopropyl)polyethyleneglycol and lithium salt. These materials present chemical bonds between the organic (polymer) and the inorganic (silica) phases. The second family has been prepared by an ultrasonic method from a mixture of tetraethoxysilane (TEOS), polyethyleneglycol and lithium salt. The organic and inorganic phases are not chemically bonded. The Li+ ionic conductivity has been studied by AC impedance spectroscopy up to 100 °C. Values of aσ up to 10−4 Scm−1 have been found at room temperature. The conduction properties have been related to the materials structure using linewidth and relaxation times NMR measurements of 7Li between −100 °C and 90 °C. A systematic study has been done changing the lithium concentration, the polymer chain length and the polymer to silica weight ratio. The structures and the ionic conduction properties of both families are compared with emphasis on the nature of the bonds between the organic and inorganic components.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 363
Copyright
Copyright © Materials Research Society 1996

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