Solution Behavior of Double-Hydrophilic Block Copolymers in Dilute Aqueous Solution

Casse, O. and Shkilnyy, A. and Linders, J. and Mayer, C. and Haussinger, D. and Volkel, A. and Thunemann, A. F. and Dimova, R. and Colfen, H. and Meier, W. and Schlaad, H. and Taubert, A.. (2012) Solution Behavior of Double-Hydrophilic Block Copolymers in Dilute Aqueous Solution. Macromolecules, Vol. 45, H. 11. pp. 4772-4777.

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Official URL: http://edoc.unibas.ch/dok/A6070453

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The self-assembly of double-hydrophilic poly(ethylene oxide)-poly(2-methyl-2-oxazoline) diblock copolymers in water has been studied. Isothermal titration calorimetry, small-angle X-ray scattering, and analytical ultracentrifugation suggest that only single polymer chains are present in solution. In contrast, light scattering and transmission electron microscopy detect aggregates with radii of ca. 100 nm. Pulsed field gradient NMR spectroscopy confirms the presence of aggregates, although only 2% of the polymer chains undergo aggregation. Water uptake experiments indicate differences in the hydrophilicity of the two blocks, which is believed to be the origin of the unexpected aggregation behavior (in accordance with an earlier study by Ke et al. [Macromolecules 2009, 42, 5339-5344]). The data therefore suggest that even in double-hydrophilic block copolymers, differences in hydrophilicity are sufficient to drive polymer aggregation, a phenomenon that has largely been overlooked or ignored so far.
Faculties and Departments:05 Faculty of Science > Departement Chemie
05 Faculty of Science > Departement Chemie > Former Organization Units Chemistry > Makromolekulare Chemie (Meier)
05 Faculty of Science > Departement Chemie > Chemie > Nuclear Magnetic Resonance (Häussinger)
UniBasel Contributors:Meier, Wolfgang P. and Häussinger, Daniel and Casse, Olivier
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Soc.
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2013 11:14
Deposited On:01 Mar 2013 11:12

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