title: In situ X-ray measurements to probe a new solid-state polycondensation mechanism for the design of supramolecular organo-bridged silsesquioxanes.
abstract: A long-range ordered organic/inorganic material is synthesized from a bis-silane, (EtO)(3)Si-(CH(2))(3)-NHCONH-C(6)H(4)-NHCONH-(CH(2))(3)-Si(OEt)(3). This crosslinked sol-gel solid exhibits a supramolecular organization via intermolecular hydrogen bonding interactions between urea groups (-NHCONH-) and covalent siloxane bonding, triple bond Si-O-Si triple bond. Time-resolved in situ X-ray measurements (coupling small- and wide-angle X-ray scattering techniques) are performed to follow the different steps involved in the synthetic process. A new mechanism based on the crystallization of the hydrolyzed species followed by their polycondensation in solid state is proposed.
authors.affiliation: Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR CNRS 5587, Université Montpellier 2, 34095 Montpellier Cedex 5, France. dieudonn@lcvn.univ-montp2.fr
authors.forename: Philippe
authors.initials: P
authors.lastname: Dieudonné
authors.forename: Michel Wong Chi
authors.initials: MW
authors.lastname: Man
authors.forename: Benoît P
authors.initials: BP
authors.lastname: Pichon
authors.forename: Luc
authors.initials: L
authors.lastname: Vellutini
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Bantignies
authors.forename: Christophe
authors.initials: C
authors.lastname: Blanc
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Creff
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Finet
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Sauvajol
authors.forename: Catherine
authors.initials: C
authors.lastname: Bied
authors.forename: Joël J E
authors.initials: JJ
authors.lastname: Moreau
mesh_terms: D008958:Models, Molecular; D012542:Scattering, Radiation; D012833:Siloxanes / Q000737:chemistry*; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D012833:Siloxanes