Issue 8, 2007
From the journal:

Journal of Materials Chemistry

Multi-scale structural description of siloxane–PPO hybrid ionic conductors doped by sodium salts†

J. A. Chaker,abc   C. V. Santilli,*a   S. H. Pulcinelli,a   K. Dahmouche,a   V. Brioisb  and  P. Judeinsteinc  

* Corresponding authors

a Instituto de Química-UNESP, CP 355, 14800-900 Araraquara, Brazil
E-mail: santilli@iq.unesp.br
Fax: 55 16 3322 7932
Tel: 55 16 3301 6645

b Synchrotron SOLEIL, UR1, L'Orme des Merisiers, BP48, Saint-Aubin, 91912 Gif sur Yvette, France

c RMN en Milieu Oriente, ICMMO, UMR CNRS 8182, Université Paris-Sud, 91405 Orsay, France

Abstract

Alkaline metal doped organic–inorganic hybrids have potential applications in the field of portable energy sources. Attractive sol–gel derived urea cross-linked polyether, siloxane–PPO (poly(propylene oxide)) hybrids doped with sodium salts (NaClO4 and NaBF4) were examined by multi-spectroscopic approach that includes complex impedance, X-ray powder diffraction (XRPD), small angle X-ray scattering (SAXS), 29Si and 23Na magic-angle spinning nuclear magnetic resonance (NMR/MAS), Na K-edge X-ray absorption near edge structure (XANES) and Raman spectroscopies. The goals of this work were to determine which cation coordinating site of the host matrix (ether oxygen atoms or carbonyl oxygen atoms) is active in each of the materials analyzed, its influence on the nanostructure of the samples and its relation with the thermal and electrical properties. The main conclusion derived from this study is that the NaBF4 salt has a much lower solubility in the hybrid matrix than the NaClO4 salt. Furthermore, the addition of a large amount of salt plays a major role in the hybrid nanostructure and electrical properties, modifying the PPO chain conformation, weakening or breaking the hydrogen bond of the polyether–urea associations and changing the polycondensation and aggregation processes involving the siloxane species.

Graphical abstract: Multi-scale structural description of siloxane–PPO hybrid ionic conductors doped by sodium salts

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Article information

DOI
https://doi.org/10.1039/B612587E
Article type
Paper
Submitted
31 Aug 2006
Accepted
27 Oct 2006
First published
15 Nov 2006

J. Mater. Chem., 2007,17, 744-757

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Multi-scale structural description of siloxane–PPO hybrid ionic conductors doped by sodium salts

J. A. Chaker, C. V. Santilli, S. H. Pulcinelli, K. Dahmouche, V. Briois and P. Judeinstein, J. Mater. Chem., 2007, 17, 744 DOI: 10.1039/B612587E

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