TITLE

Measured coexistence curves of phase-separated polymer solutions

AUTHOR(S)
Xia, K.-Q.; An, X.-Q.; Shen, W.-G.
PUB. DATE
October 1996
SOURCE
Journal of Chemical Physics;10/8/1996, Vol. 105 Issue 14, p6018
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Measurements of the coexistence curves for phase-separated polymer solutions of polymethylmethacrylate in 3-octanone (PMMA/3-OCT) for six different molecular weights of PMMA have been carried out. We have tested the scaling behavior of the order parameter Δ[lowercase_phi_synonym] (the difference between polymer volume fractions in the two coexisting phases) for its dependence on the degree of polymerization N of the polymer chains and the reduced temperature ε=(Tc-T)/Tc. The experiments reveal that, in the asymptotic regime, the measured order parameter has power-law dependence on both N and ε, i.e., Δ[lowercase_phi_synonym]=3.8N-0.21ε0.34. Furthermore, when the symmerization procedure of Sanchez [J. Appl. Phys. 58, 2871 (1985)] is used to analyze the data, it suggests that εN0.46 may be used as a scaling variable for phase separated polymer solutions. © 1996 American Institute of Physics.
ACCESSION #
7625064

 

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