Dendronized Hyperbranched Macromolecules: Soft Matter with a Novel Type of Segmental Distribution

Dendronization of a hyperbranched polyester with different generation dendrons leads to pseudo‐dendritic structures. The hyperbranched core is modified by the divergent coupling of protected monomer units to the functional groups. Compared to dendrimers, the synthetic effort is significantly less, b...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2015-10, Vol.54 (43), p.12578-12583
Main Authors: Lederer, Albena, Burchard, Walther, Hartmann, Tobias, Haataja, Johannes S., Houbenov, Nikolay, Janke, Andreas, Friedel, Peter, Schweins, Ralf, Lindner, Peter
Format: Article
Language:English
Subjects:
branching parameters
Dendrimers
Density
draining parameter
Functional groups
hyperbranched
Light scattering
Macromolecules
Molecular dynamics
Molecular structure
Nanostructure
pseudo-dendrimer
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Summary:Dendronization of a hyperbranched polyester with different generation dendrons leads to pseudo‐dendritic structures. The hyperbranched core is modified by the divergent coupling of protected monomer units to the functional groups. Compared to dendrimers, the synthetic effort is significantly less, but the properties are very close to those of high‐generation dendrimers. The number of functional groups, molar mass, and rheology behavior even in the early generation (G1–G4) pseudo‐dendrimers strongly resembles the behavior of dendrimers in higher generations (G5–G8). Comparison of the segmental and internal structure with perfect dendrimers is performed using SANS, dynamic light scattering and viscosity analysis, microscopy and molecular dynamics simulation. The interpretation of the results reveals unique structural characteristics arising from lower segmental density of the core, which turns into a soft nano‐sphere with a smooth surface even in the first generation. The generation game: A hyperbranched polymer core modified with different generation dendrons has properties very similar to those of perfectly branched, high‐generation dendrimers. The pseudo‐dendrimers reveal unique structural confinements that are based on the lower segmental density of the core which is transformed in a smooth and compact nanosphere after modification.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201504059