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Structure of The Diblock Co-Polywer Aggregates in Solution

Published online by Cambridge University Press:  25 February 2011

J. S. Huang ,
L. J. Fetters ,
J. Sung ,
H. Y. Lin ,
D. Richter ,
N. Hadjichristidis ,
B. Farago  and
A. P. Gast
J. S. Huang
Affiliation:
Exxon Research and Engineering Co., Annandale, NJ 08801
L. J. Fetters
Affiliation:
Exxon Research and Engineering Co., Annandale, NJ 08801
J. Sung
Affiliation:
Exxon Research and Engineering Co., Annandale, NJ 08801
H. Y. Lin
Affiliation:
Exxon Research and Engineering Co., Annandale, NJ 08801
D. Richter
Affiliation:
KFA, Postfach 1913, 5170 Julich, Germany
N. Hadjichristidis
Affiliation:
Department of Chemistry, University of Athens, Athens, Greece
B. Farago
Affiliation:
Institut Laue-Langevin, Grenoble, France
A. P. Gast
Affiliation:
De partment of Chemical Engineering, Stanford University, Stanford, CA 94305
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Abstract

We have employed a variety of scattering techniques to study the structure of diblock copolymer aggregates in solution The system of interest is an anionically prepared poly(styrene-isoprene) diblock copolymer (PS-PI) with well defined molecular weight and composition. When the diblock copolymer is added to decane, which dissolves the polyisoprene but not the polystyrene, we observe that polymeric micelles form at concentrations above a critical micellar concentration. The aggregation number is determined by light scattering and neutron scattering to be roughly 120. The micellar aggregate consists of a spherical polystyrene core with a mean radius of 105 A surrounded by a PI corona. The size distribution is quite narrow (<10%). The PS core is swollen with the solvent by roughly a factor of 2 in volume. By combining dynamic light scattering and SANS, we determined the thickness of the corona to be 50 A, which is 70% larger than the radius of gyration of a free PI chain of the same molecular weight in a good solvent. Furthermore, SANS measurements suggest that the aggregates form an ordered phase at the nominal cross-over concentration as it is expected for a highly functionalized star-branched macromolecules in solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 355
Copyright
Copyright © Materials Research Society 1992

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