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Home  >  Journal list  >  Polymer Journal  >  Vol.14  No.5 (1982)  >  pp.355-361

Polymer Journal
<<Previous article Vol.14  No.5 (1982)   pp.355 - 361 Next article>>

Further Study on the Evaluation of Molecular Weight Dependence of χ-Parameter by Phase Equilibrium Experiment on Polystyrene–Methylcyclohexane System

Kenji Kamide1), Tatsuyuki Abe1) and Yukio Miyazaki1)
1) Textile Research Laboratory, Asahi Chemical Ind. Co. Ltd.

ABSTRACT:  For evaluating the molecular weight dependence of a thermodynamic interaction parameter χ, phase equilibrium experiments on the polystyrene–methylcyclohexane system were carefully carried out. The mathematical phase equilibrium of this polymer–solvent system was determined by taking into account the molecular weight- and concentration-dependences of the χ-parameter, according to the expression χ=χ00(1+kX)(1+pvp), where χ00 is a constant independent of both polymer molecular weight and concentration, X, the molar volume ratio of the polymer to the solvent, vp, the polymer volume fraction, and k and p are molecular weight- and concentration-dependence coefficients. The partition coefficient σ increased remarkably with 1⁄X and k decreased linearly with an increase in the phase equilibrium temperature T, generally expressed by k=k0 (1−T⁄θ) (θ is Flory’s theta temperature and k0 is a constant).


Keyword:
Phase Equilibrium/ Thermodynamic Interaction Parameter/ Polystyrene/ Partition Coefficient

Published online: March 03, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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