Non-symmetrical Bis-silylated Precursor Can (Also) Self-Direct the Assembly of Silsesquioxane Films - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Sol-Gel Science and Technology Année : 2017

Non-symmetrical Bis-silylated Precursor Can (Also) Self-Direct the Assembly of Silsesquioxane Films

Résumé

Symmetric α,ω-bis-silylated precursors are the standard building blocks of self-assembled bridged silsesquioxanes, a unique class of robust ordered nanomaterials prepared by sol-gel process without external surfactant. We report an unprecedented approach based on the utilization of a dissymmetric bis-silylated precursor, 1,2-bis(trimethoxysilyl)decane (1), in which the two alkoxy groups are carried by adjacent methylene groups. Extensive characterization—based on X-ray diffraction, real-time fourier transform infrared, electron and optical microscopy, 29Si solid-state nuclear magnetic resonance, thermogravimetry, and molecular modeling—shows surprisingly that such non-symmetrical precursor is highly conducive to achieve highly ordered lamellar mesostructure, able to sustain temperature up to 120 °C. To emphasize the effect of the alkoxy group functionality and position, comparison is made systematically with analogous silsesquioxanes derived from bis-(2) and mono-silylated (3) precursors. The sol-gel polymerization of 1 is unique by its ability to produce a homogeneous film possessing structural characteristic on multiple scales: uniform microcrystallites consisting of nanolamellar organosilica hybrid material. The most likely mesostructure consists of bilayers of slightly interpenetrated trans C8H9 chains, with a single central siloxy-hydrocarbon chain (Si2O(OH)4-C2H3) n . To permit a good lateral chain packing, the hydrocarbon chain of two adjacent silicon atoms point in opposite directions.

Domaines

Polymères
Fichier principal
Vignette du fichier
Geometric effect to organosilane self-assembly-v8.pdf (1.44 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02442153 , version 1 (16-01-2020)

Identifiants

Citer

Lingli Ni, Abraham Chemtob, Céline Croutxe-Barghorn, Séverinne Rigolet, Irena Deroche, et al.. Non-symmetrical Bis-silylated Precursor Can (Also) Self-Direct the Assembly of Silsesquioxane Films. Journal of Sol-Gel Science and Technology, 2017, 84, pp.222-230. ⟨10.1007/s10971-017-4482-0⟩. ⟨hal-02442153⟩
13 Consultations
69 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More