--------------------
- In situ X-ray Measurements to Probe a New Solid-State Polycondensation Mechanism for the Design of Supramolecular Organo-Bridged Silsesquioxanes doi link

Auteur(s): Dieudonne-George P.(Corresp.), Wong Chi Man Michel(Corresp.), Pichon Benoît P., Vellutini Luc, Bantignies J.-L., Blanc C., Creff Gaelle, Finet Stéphanie, Sauvajol J.-L., Bied Catherine, Moreau Joël J.E.

(Article) Publié: Small, vol. 5 p.503-510 (2009)


Ref HAL: hal-00381858_v1
PMID 19173348
DOI: 10.1002/smll.200800254
WoS: 000264327500014
Exporter : BibTex | endNote
25 Citations
Résumé:

A long-range ordered organic/inorganic material is synthesized from a bissilane, (EtO)3Si–(CH2)3–NHCONH–C6H4–NHCONH–(CH2)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, Si–O–Si . 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.