Journal of Sol-Gel Science and Technology

, Volume 32, Issue 1–3, pp 63–67 | Cite as

Lamellar Organo-Bridged Silicones

  • Joël J. E. Moreau
  • Luc Vellutini
  • Catherine Bied
  • Michel Wong Chi Man
Article

Abstract

The acid-hydrolysis of an organo-bridged bisdiethoxysilylated molecular precursor bearing urea groups, (EtO)2MeSi(CH2)3NHCONH(CH2)12NHCONH(CH2)3SiMe(OEt)2, has been performed in pure aqueous medium. Scanning electron microscopy (SEM) analysis of the resulting insoluble solid revealed plate-like forms with a lamellar structure as determined by powder X-ray diffraction (PXRD) studies with a sharp peak at 28.5 Å. The solid state 29Si MAS-NMR spectrum of this bridged siloxane hybrid is consistent with a moderately condensed material with complete preservation of the Si–C bonds throughout the hybrid network. In comparison, the classical sol–gel hydrolysis-condensation of the molecular precursor in ethanol with stoichiometric amount of water and fluoride anion as catalyst produced an amorphous featureless solid.

Keywords

lamellar silicones nano-structured materials organo-bridged hybrid sol–gel 
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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Joël J. E. Moreau
    • 1
  • Luc Vellutini
    • 1
  • Catherine Bied
    • 1
  • Michel Wong Chi Man
    • 1
  1. 1.Hétérochimie Moléculaire et MacromoléculaireUMR CNRS 5076, (ENSCM) Ecole Nationale Supérieure de Chimie de Montpellier 8Montpellier Cédex 5France

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