Carbosilane-Based Dendritic Polyols
| Autor: | Rolf Muelhaupt, Uwe Rapp, Holger Frey, Franz J. Mayer-Posner, Klaus Lorenz |
|---|---|
| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Macromolecules. 28:6657-6661 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00123a036 |
| Popis: | A divergent hydrosilation/Grignard-reaction sequence, followed by hydroboration of the allyl end groups was employed to prepare a series of novel dendritic carbosilane polyols. Dendrimers with 4, 12, 36, and 108 hydroxyl end groups have been prepared. The hydroboration reactions were monitored by 1 H-NMR and MALDI-TOF and were quantitative in all cases. Using MALDI-TOF, the carbosilane dendrimers as well as the novel dendritic polyols have been characterized directly with respect to polydispersity. Whereas G2-OH consisted of mainly two species, the desired 36-ol (80%) and the 34-ol, G3-OH consisted of polyols with 92-108 hydroxyl groups. The dendritic polyols possess low glass transition temperatures (233-241 K) and thus constitute flexible polyols without polar interactions between the dendrons. The molecules appear suitable as chemically stable, flexible molecular scaffolds for the construction of unusual supermolecular architectures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|