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Science 12 February 1999:
Vol. 283. no. 5404, pp. 960 - 963
DOI: 10.1126/science.283.5404.960
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Reports

Giant Wormlike Rubber Micelles

You-Yeon Won, H. Ted Davis, Frank S. Bates *

A low molecular weight poly(ethyleneoxide)-poly(butadiene) (PEO-PB) diblock copolymer containing 50 weight percent PEO forms gigantic wormlike micelles at low concentrations (<5 percent by weight) in water. Subsequent generation of free radicals with a conventional water-based redox reaction leads to chemical cross-linking of the PB cores without disruption of the cylindrical morphology, as evidenced by cryotransmission electron microscopy and small-angle neutron scattering experiments. These wormlike rubber micelles exhibit unusual viscoelastic properties in water.

Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
*   To whom correspondence should be addressed.

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