Journal
COLLOID AND POLYMER SCIENCE
Volume 284, Issue 11, Pages 1293-1301Publisher
SPRINGER
DOI: 10.1007/s00396-006-1522-7
Keywords
hyperbranched polyelectrolyte; Michael addition; ordered structures
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The preparation of carboxylated hyperbranched polyglycerols of narrow polydispersity was achieved by modification (78-90%) of the hydroxyl end groups via Michael addition of acrylonitrile, followed by hydrolysis. High conversion could only be achieved for low molecular weight starting materials (520 and 1,030 g mol(-1)). The solution properties of the resulting materials were investigated by dynamic light scattering (DLS), showing the formation of large aggregates with size depending on the pH value. After deposition on a negatively charged mica surface, the structures observed by atomic force microscope (AFM) show the coexistence of aggregates and single macromolecules. Most interesting, in the case of the lower molecular weight sample (PG 520 g mol(-1)), extended and ordered terrace structures were formed, which are unprecedented for hyperbranched polymers and are of interest for surface modification in general.
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