Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 686, Issue 1-2, Pages 127-133Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-328X(03)00440-6
Keywords
hybrid xerogels; silylcarbodiimides; synthesis; porosity
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Hybrid polymers consisting of flexible organic chains within an inorganic silsesquicarbodiimide network of the type [(NCN)(1.5)Si-(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 C-13 CP MAS- and Si-29 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. (C) 2003 Elsevier B.V. All rights reserved.
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