Please use this identifier to cite or link to this item: doi:10.22028/D291-23943
Title: Solid state 29Si NMR investigation of inorganic-organic polymers with defined silicic acid units
Author(s): Hoebbel, Dagobert
Endres, Klaus
Pitsch, Irene
Heidemann, D.
Language: English
Year of Publication: 1992
OPUS Source: Eurogel '92 : proceedings of the Third European Conference on Sol-Gel Technology, Colmar, France, December 1-4, 1992. - Colmar, 1992, S. 1-9
SWD key words: Festkörper
Anorganische Polymere
DDC notations: 540 Chemistry
Publikation type: Conference Paper
Abstract: By thermal analysis and 29Si NMR spectroscopy the thermal behaviour and structural changes of two different types of inorganic-organic polymers with defined double four-ring silicic acid units (Si8O20) were characterized. Polymer 1, prepared from the organic silicic acid precursors [(CH3)2HSi]8Si8O20 (Q8M8H) and [CH2=CH(CH3)2Si]8Si8O20 (Q8M8V), preserves the double four-ring structure up to 350°C Higher temperatures lead to structural reorganizations of the SiO4 tetrahedra forming at 900°C a structure similiar to amorphous silica. Polymer 2, synthesized by condensation reaction of the new organic silicic acid precursor [CH3O)3Si(CH2)3OC(O)CH(CH3)CH2Si(CH3)2]8Si8O20, shows with 37% uncondensed SiOH groups a remarkable high content of silanol groups caused by sterical hindrances.
Link to this record: urn:nbn:de:bsz:291-scidok-19486
Date of registration: 22-Dec-2008
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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