Sharp crossover of the susceptibility in polymer solutions near the critical demixing point

被引：86

作者：

Melnichenko, YB

Anisimov, MA

Povodyrev, AA

Wignall, GD

Sengers, JV

van Hook, WA

机构：

[1] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

[2] Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 USA

[3] Univ Maryland, Dept Chem Engn, College Pk, MD 20742 USA

[4] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.79.5266

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 Theta 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.

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页码：5266 / 5269

页数：4

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