Phys. Rev. Lett. 79, 5266 - 5269 (1997)Sharp Crossover of the Susceptibility in Polymer Solutions near the Critical Demixing Point |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1981: |
Y. B. Melnichenko1, M. A. Anisimov2, A. A. Povodyrev2, G. D. Wignall1, J. V. Sengers2, and W. A. Van Hook3
1Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393
2Institute for Physical Science and Technology and Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742
3Department of Chemistry, University of Tennessee, Tennessee 37996
Received 12 June 1997
We have observed a sharp and nonmonotonic crossover of the susceptibility (osmotic compressibility) from mean-field to Ising critical behavior in semidilute solutions of polystyrene in deuterocyclohexane as the temperature decreases from the Θ region down to the critical temperature of the phase separation. We describe this crossover in terms of a competition between the long-range but finite intramolecular correlations of monomers in the polymer chain and the diverging correlation length of concentration fluctuations.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v79/p5266
DOI: 10.1103/PhysRevLett.79.5266
PACS: 61.41.+e, 05.70.Jk, 64.60.Fr
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