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Tracer-Diffusion in Weakly-Ordered Block Copolymers

Published online by Cambridge University Press:  21 February 2011

Glenn H. Fredrickson  and
Scott T. Milner
Glenn H. Fredrickson
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
Scott T. Milner
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974 Exxon Research and Engineering Company, Annandale, NJ 08801
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Abstract

We have investigated the self and tracer-diffusion properties of a labeled diblock copolymer in a weakly-ordered lamellar phase. This phase can be a pure copolymer of equal or different molecular weight, or might contain added homopolymer. The spatially-periodic chemical potential field presented by the lamellar phase is capable of strongly influencing the diffusive motion of the tracer. In general, this field serves to slow diffusion, although the manner in which it acts depends on the wavelength of the potential relative to the labeled copolymer radius-of-gyration and on the composition of the copolymer. In the extreme limit of compositional asymmetry of the diblock tracer, we obtain results for the tracer-diffusion coefficient of a homopolymer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 169
Copyright
Copyright © Materials Research Society 1990

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References

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