Interdisziplinäres Zentrum für Materialwissenschaften
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Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4,
D-06120 Halle, Germany
Phone: +49 345 55 28471
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K. Edelmann, M. Janich, E. Hoinkis, W. Pyckhout-Hintzen, S. H?ring
The aggregation behavior of poly(ethylene oxide)-poly(methyl methacrylate) diblock copolymers in organic solvents
Macromol. Chem. Phys. 202, 9 (2001), 1638-1644

Poly(ethylene oxide)-poly(methyl methacrylate) and poly(ethylene oxide)-poly(deuteromethyl methacrylate) block copolymers have been prepared by group transfer polymerization of methyl methacrylate (MMA) and deuteromethyl methacrylate (MMA-d8), respectively, using macroinitiators containing poly(ethylene oxide) (PEO). Static and dynamic light scattering and surface tension measurements were used to study the aggregation behavior of PEO-PMMA diblock copolymers in the solvents tetrahydrofuran (THF), acetone, chloroform, N,N-dimethylformamide (DMF), 1,4-dioxane and 2,2,2-trifluoroethanol. The polymer chains are monomolecularly dissolved in 1,4-dioxane, but in the other solvents, they form large aggregates. Solutions of partially deuterated and undeuterated PEO-PMMA block copolymers in THF have been studied by small-angle neutron scattering (SANS). Generally, large structures were found, which cannot be considered as micelles, but rather fluctuating structures. However, 1H NMR measurements have shown that the block copolymers form polymolecular micelles in THF solution, but only when large amounts of water are present. The micelles consist of a PMMA core and a PEO shell.
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