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Domain Growth and Wetting in Polymer Mixtures

Published online by Cambridge University Press:  25 February 2011

Andrew W. Cumming  and
Pierre Wiltzius
Andrew W. Cumming
Affiliation:
University of Florida, Department of Physics, Gainesville, FL 32611
Pierre Wiltzius
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
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Abstract

We present the results of phase-separation experiments performed on the binary polymer blend polyisoprene-poly(ethylene-propylene). Elastic light scattering and optical microscopy were used to follow the phase-separation after quenches into the coexistence region of the phase diagram. For critical quenches, we observed the well known bicontinuous infinite cluster morphology normally associated with spinodal decomposition, but with two distinct growth modes. In the bulk, we observed L(t) - t1/3 consistent with diffusion driven dynamics, whereas near the sample walls, there obtained a novel fast growth with L(t) -t 3/2, inconsistent with either diffusion or interface driven dynamics. We attribute this large exponent to wetting effects, but still lack any theoretical understanding of the phenomenon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 437
Copyright
Copyright © Materials Research Society 1992

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