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 hdl:20.500.11880/23999 http://dx.doi.org/10.22028/D291-23943 |
Date of registration: | 22-Dec-2008 |
Faculty: | SE - Sonstige Einrichtungen |
Department: | SE - INM Leibniz-Institut für Neue Materialien |
Collections: | INM SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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