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Journal of Sol-Gel Science and Technology
Erschienen in: Journal of Sol-Gel Science and Technology 1/2019

01.06.2018 | Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Structuring of di-alkyl-urethanesils

verfasst von: M. C. Gonçalves, R. F. P. Pereira, P. Ferreira, E. Carbó-Argibay, J. Catita, G. Toquer, S. C. Nunes, V. de Zea Bermudez

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 1/2019

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Abstract

A novel organized di-urethane crossed-linked dodecyl/siloxane (di-alkyl-urethanesil) was synthesized by the sol–gel process and self-directed assembly, from the organosilane precursor (CH3CH2O)3-Si-(CH2)3-NHC( = O)O-(CH2)12-O(O = C)NH-(CH2)3-Si-(OCH2CH3)3, through a fine control of the reaction conditions (hyper-stoichiometric amount of water, minor amount of tetrahydrofuran, and acid catalysis; molar ratio Si:H2O:HCl:THF = 1:300:0.1:12.5). The new bridged silsesquioxane was identified by the notation d-Ut(CY)AC, where Y = 12 is the number of carbon atoms C of the bridging alkyl chains and AC represents acid catalysis. The d-Ut(C12)AC material exhibits a structured lamellar organization with medium long-range order, a texture composed of homogeneous lamellae immersed in a sponge-like matrix made of randomly distributed thin plates, and is thermally stable up to ca. 350 °C. Despite the hydrophobic nature of the dodecane chains, the weakness of the urethane–urethane hydrogen-bonded array formed led to the growth of moderately ordered assemblies of amphiphilic organo(bis-silanetriol) substructures comprising mainly all-trans conformers.
Vorheriger Artikel SiO2–TiO2 multilayer via electrochemical deposition: characterization of reflection and refractive index
Nächster Artikel Mesoporous microspheres of nickel-based layered hydroxides by aerosol-assisted self-assembly using crystalline nano-building blocks

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Metadaten
Titel
Structuring of di-alkyl-urethanesils
verfasst von
M. C. Gonçalves
R. F. P. Pereira
P. Ferreira
E. Carbó-Argibay
J. Catita
G. Toquer
S. C. Nunes
V. de Zea Bermudez
Publikationsdatum
01.06.2018
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 1/2019
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-018-4703-1

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