Szczegóły publikacji
Opis bibliograficzny
Spectroscopic study of ceramic precursors obtained by hydrolytic condensation of ethoxycyclotetrasiloxane / M. HANDKE, A. Kowalewska, W. MOZGAWA // Journal of Molecular Structure ; ISSN 0022-2860 . — 2008 — vol. 887 iss. 1–3, s. 152–158. — Bibliogr. s. 158, Abstr.
Autorzy (3)
- AGHHandke Mirosław
- Kowalewska Anna
- AGHMozgawa Włodzimierz
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 40564 |
|---|---|
| Data dodania do BaDAP | 2008-10-08 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.molstruc.2007.12.037 |
| Rok publikacji | 2008 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Molecular Structure |
Abstract
Hydrolytic polycondensation process, also called sol-gel process, leads to formation of xerogels from simple molecules e.g. most widely used tetraethoxysilane (TEOS). In the presented work 2,4,6,8-tetraethoxy-2,4,6,8-tetramethylcyclotetrasiloxane - D-4(OEt)(4) was applied as the molecular precursor. Polycondensation reactions were performed in the presence of Bu4NF or HCl/NH4OH as the catalysts. The obtained xerogels were studied by FT-IR, MAS-NMR and XRD methods. Depending on the condensation process conditions, structure of the resulting materials varied from octahedral cage unit (T-8) through a ladder chain to random structure. Dried xerogels were heated at the temperature of 800 and 1000 degrees C in argon or air atmosphere (pyrolysis or ceramization). In the atmosphere of argon SiCxOy glass materials were obtained, while in air silica glass was formed. Their properties depended on the pyrolysis conditions as well as on the xerogel structure. IR spectroscopy results allowed to conclude about the short range order in amorphous xerogel and glass materials. (c) 2008 Elsevier B.V. All rights reserved.
