Europhys. Lett, 48 (4), pp. 372-377 (1999)
Molecular weight scaling in critical polymer solutions
Y. B. Melnichenko 1, G. D. Wignall 1 and W. A. Van Hook 2
1 Solid State Division, Oak Ridge National Laboratory - Oak Ridge, TN 37831, USA
2 Department of Chemistry, University of Tennessee - TN 37996, USA
(received 6 August 1999; accepted 13 September 1999)
PACS. 05.70Jk - Critical point phenomena.
PACS. 61.41 - Polymers, elastomers, and plastics.
PACS. 64.60Fr - Equilibrium properties near critical points, critical exponents.
In this letter we address the long-standing controversy which originated from differences between the experimental and theoretical values of the scaling exponent (n) for the critical amplitude of the correlation length in polymer solutions. Using small-angle neutron scattering we examine the dependence of on polymer molecular weight in polystyrene-methylcyclohexane- solutions. We find that the experimental values of in the critical region of phase demixing as well as in the mean-field domain around the temperature agree with the predictions of scaling theory , .
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