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Light-scattering Study of the Association Behavior of Styrene-ethylene Oxide Block Copolymers in Aqueous Solution by Renliang Xu; Mitchell A. Winnik; F. R. Hallett; Gerard Riess; Melvin D. Croucher is a Materials Science article available to read on EtoBox.

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Static and dynamic light-scatterning studies on the micellization behavior in aqueous solution of poly(styrene-oxyethylene) diblock and poly(oxyethy1ene-styrene-oxyethylene) triblock copolymer are presented. Two narrowly distributed populations of particles are found in the solution. The sizes of the large particles and the small particles remain unchanged in a concentration range from 2 X g/mL. The weight fraction of the large particles, however, decreases with increasing concentration, unlike in most common aggregation processes. Detailed analysis reveals that the small particles ( R h -20 nm) are regular micelles with association number of a few hundreds, and the large particles ( R h -65 nm) are loose micellar clusters consisting of tens of micelles. The micelle structure is core-shell type with a dense and glassy polystyrene core and a highly swollen poly(oxyethy1ene) shell. to 2 X

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Author

Renliang Xu; Mitchell A. Winnik; F. R. Hallett; Gerard Riess; Melvin D. Croucher

Published

1991

Language

EN

Field

Materials Science (Physical Sciences)