Lorenz, K. ; Frey, H. ; Stühn, B. ; Mulhaupt, R. (1997)
Carbosilane dendrimers with perfluoroalkyl end groups. Core-shell macromolecules with generation-dependent order.
In: Macromolecules, 30 (22)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A series of carbosilane dendrimer generations, G0 to G3, with 4, 12, 36, and 108 end groups, respectively, has been functionalized with perfluorohexyl (C6F13-) groups On the surface. Quantitative perfluoroalkylation of the dendrimer surface was achieved via free radical addition of 3,3,4,3,5,5,6,6,7,7,8,8,8-tridecafluoro-n-octyl mercaptan. Quantitative perfluoroalkylation of the dendrimers was demonstrated by NMR and SEC. The thermal properties of the dendrimers with core-shell structure were investigated by DSC, polarizing microscopy, and WAXS. Whereas GO was obtained as a crystalline material that did not show the formation of mesophases, G1 (12 end groups) exhibited the formation of a highly ordered smectic mesophase between -15 and -30 degrees C. In contrast, G2 and G3 did not form mesophases; however, a transition to a most probably hexagonally ordered array of columns could be observed. The generation-dependent thermal behavior is ascribed to the increasingly dense packing of perfluorohexyl groups on the dendrimer surface.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1997 |
| Autor(en): | Lorenz, K. ; Frey, H. ; Stühn, B. ; Mulhaupt, R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Carbosilane dendrimers with perfluoroalkyl end groups. Core-shell macromolecules with generation-dependent order |
| Sprache: | Englisch |
| Publikationsjahr: | November 1997 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Macromolecules |
| Jahrgang/Volume einer Zeitschrift: | 30 |
| (Heft-)Nummer: | 22 |
| Kurzbeschreibung (Abstract): | A series of carbosilane dendrimer generations, G0 to G3, with 4, 12, 36, and 108 end groups, respectively, has been functionalized with perfluorohexyl (C6F13-) groups On the surface. Quantitative perfluoroalkylation of the dendrimer surface was achieved via free radical addition of 3,3,4,3,5,5,6,6,7,7,8,8,8-tridecafluoro-n-octyl mercaptan. Quantitative perfluoroalkylation of the dendrimers was demonstrated by NMR and SEC. The thermal properties of the dendrimers with core-shell structure were investigated by DSC, polarizing microscopy, and WAXS. Whereas GO was obtained as a crystalline material that did not show the formation of mesophases, G1 (12 end groups) exhibited the formation of a highly ordered smectic mesophase between -15 and -30 degrees C. In contrast, G2 and G3 did not form mesophases; however, a transition to a most probably hexagonally ordered array of columns could be observed. The generation-dependent thermal behavior is ascribed to the increasingly dense packing of perfluorohexyl groups on the dendrimer surface. |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik |
| Hinterlegungsdatum: | 27 Feb 2010 12:31 |
| Letzte Änderung: | 05 Mär 2013 09:32 |
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