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Synthesis and characterization of alkylene-bridged silsesquicarbodiimide hybrid xerogels

Nahar-Borchert, Saifun and Kroke, Edwin and Riedel, Ralf and Boury, Bruno and Corriu, Robert J. P. (2003):
Synthesis and characterization of alkylene-bridged silsesquicarbodiimide hybrid xerogels.
In: Journal of Organometallic Chemistry, 686 (1-2), pp. 127-133. Elsevier, ISSN 0022328X,
[Article]

Abstract

Hybrid polymers consisting of flexible organic chains within an inorganic silsesquicarbodiimide network of the type [(NCN)1.5Si-(CH2)x-Si(NCN)1.5]n (where x=2, 6, and 8) were prepared by mild sol–gel polycondensation reactions of bis(trichlorosilyl)alkanes and bis(trimethylsilyl)carbodiimide. The presence of the NCN groups in xerogel structures was identified by FTIR spectra. The composition and molecular structures were characterized by elemental analysis, solid-state 13C CP MAS- and 29Si CP MAS-NMR spectroscopies, and XRD. Scanning as well as transmission electron microscopies were used to examine the morphology of the xerogels. In addition, the pore structure of the materials was examined by the gas adsorption (BET) method and it is found that the surface area decreased with increasing length of the alkylene spacing group. Hybrid polymers consisting of flexible organic chains within an inorganic silsesquicarbodiimide network of the type [(NCN)1.5Si-(CH2)x-Si(NCN)1.5]n (where x=2, 6, and 8) were prepared by mild sol–gel polycondensation reactions of bis(trichlorosilyl)alkanes and bis(trimethylsilyl)carbodiimide. The presence of the NCN groups in xerogel structures was identified by FTIR spectra.

Item Type: Article
Erschienen: 2003
Creators: Nahar-Borchert, Saifun and Kroke, Edwin and Riedel, Ralf and Boury, Bruno and Corriu, Robert J. P.
Title: Synthesis and characterization of alkylene-bridged silsesquicarbodiimide hybrid xerogels
Language: English
Abstract:

Hybrid polymers consisting of flexible organic chains within an inorganic silsesquicarbodiimide network of the type [(NCN)1.5Si-(CH2)x-Si(NCN)1.5]n (where x=2, 6, and 8) were prepared by mild sol–gel polycondensation reactions of bis(trichlorosilyl)alkanes and bis(trimethylsilyl)carbodiimide. The presence of the NCN groups in xerogel structures was identified by FTIR spectra. The composition and molecular structures were characterized by elemental analysis, solid-state 13C CP MAS- and 29Si CP MAS-NMR spectroscopies, and XRD. Scanning as well as transmission electron microscopies were used to examine the morphology of the xerogels. In addition, the pore structure of the materials was examined by the gas adsorption (BET) method and it is found that the surface area decreased with increasing length of the alkylene spacing group. Hybrid polymers consisting of flexible organic chains within an inorganic silsesquicarbodiimide network of the type [(NCN)1.5Si-(CH2)x-Si(NCN)1.5]n (where x=2, 6, and 8) were prepared by mild sol–gel polycondensation reactions of bis(trichlorosilyl)alkanes and bis(trimethylsilyl)carbodiimide. The presence of the NCN groups in xerogel structures was identified by FTIR spectra.

Journal or Publication Title: Journal of Organometallic Chemistry
Journal volume: 686
Number: 1-2
Publisher: Elsevier
Uncontrolled Keywords: Hybrid xerogels, Silylcarbodiimides, Synthesis, Porosity
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 23 Apr 2012 11:21
Official URL: http://dx.doi.org/10.1016/S0022-328X(03)00440-6
Identification Number: doi:10.1016/S0022-328X(03)00440-6
Funders: The authors gratefully acknowledge Fonds der Chemischen Industrie, Frankfurt (Germany) and the Deutsche Forschungsgemeinschaft (DFG), Bonn (Germany), for financial support of the present work by funding the project Kr1739/5-1.
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