New routes to silicic acid containing inorganic-organic hybrid precursors and polymers
Conference
·
OSTI ID:51658
- Im Stadtwald, Saarbruecken (Germany). Inst. fuer Neue Materialien
In view of the outstanding role that silicic acids (s.a.) play in inorganic materials a survey is a presented regarding the possibilities of the integration of s.a. in organic matrices via chemical reactions. The objective is to combine the advantageous properties of the silicic acid with those of the organic compounds in order to generate novel materials. The reactions of silicic acids with organic molecules, as studied by {sup 29}Si NMR spectroscopy, are described using the silicic acid H{sub 8}Si{sub 8}O{sub 20} with a defined double four-ring structure as an example. By silylation of the hydrophilic H{sub 8}Si{sub 8}O{sub 20} its functional organophilic derivatives were synthesized. The s.a. derivatives with epoxy-, alkoxy-, HSi-, ketoester or unsaturated groups are capable of condensation, polymerization, complexation or additive reactions leading to reactive inorganic-organic precursors or polymers with the defined silicic acid unit. The synthesis and structure of the following s.a. containing precursors and polymers are reported: (a) inorganic-organic polymers with a high content of silanol groups, (b) microporous polymers free of silanol groups and (c) metal (Al, Zr) alkoxide complexes attached to defined silicic acid units. The model reactions of the double four-ring silicic acid derivatives can be transferred to technical silicic acid solutions prepared from water glass. The presented reaction pathways are a basis for the preparation of a great variety of new inorganic-organic compounds with tailor-made structures and properties which can be used for highly homogeneous and stoichiometric materials.
- OSTI ID:
- 51658
- Report Number(s):
- CONF-940411--; ISBN 1-55899-246-4
- Country of Publication:
- United States
- Language:
- English
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