Balan, C. ; Völger, K.-W. ; Kroke, E. ; Riedel, R. (2000)
Viscoelastic properties of novel silicon carbodiimide gels.
In: Macromolecules, 33 (9)
doi: 10.1021/ma991756p
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A novel non-oxide sol-gel system based on the reaction of bis(trimethylsilyl)carbodiimide with methyltrichlorosilanes has been examined quantitatively with regard to its viscoelastic properties. The chemistry and phenomenology of this process are completely analogous to the well-known oxide solgel process. The changes of the elastic modulus G¢ and the viscous modulus G¢¢ have been measured with low strain amplitude and constant frequency versus time. At the crossover point, i.e., G¢ ) G¢¢, the gel point is reached. The gelation time is independent of the oscillatory frequency ˆ. The dynamic moduli G¢ and G¢¢ have also been measured versus strain amplitude and shear stress amplitude. A relaxation exponent of n ) 0.65, strength S ) 0.25, and G¢(end of reaction) ) 105 Pa‚s have been determined.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2000 |
| Autor(en): | Balan, C. ; Völger, K.-W. ; Kroke, E. ; Riedel, R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Viscoelastic properties of novel silicon carbodiimide gels |
| Sprache: | Englisch |
| Publikationsjahr: | 2000 |
| Verlag: | ACS |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Macromolecules |
| Jahrgang/Volume einer Zeitschrift: | 33 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1021/ma991756p |
| Kurzbeschreibung (Abstract): | A novel non-oxide sol-gel system based on the reaction of bis(trimethylsilyl)carbodiimide with methyltrichlorosilanes has been examined quantitatively with regard to its viscoelastic properties. The chemistry and phenomenology of this process are completely analogous to the well-known oxide solgel process. The changes of the elastic modulus G¢ and the viscous modulus G¢¢ have been measured with low strain amplitude and constant frequency versus time. At the crossover point, i.e., G¢ ) G¢¢, the gel point is reached. The gelation time is independent of the oscillatory frequency ˆ. The dynamic moduli G¢ and G¢¢ have also been measured versus strain amplitude and shear stress amplitude. A relaxation exponent of n ) 0.65, strength S ) 0.25, and G¢(end of reaction) ) 105 Pa‚s have been determined. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 19 Nov 2008 16:24 |
| Letzte Änderung: | 12 Jan 2021 14:27 |
| PPN: | |
| Sponsoren: | Financial support by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie is gratefully acknowledged., For offering a research fellowship to Prof. Corneliu Balan acknowledges the financial support of DAAD, Bonn. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum