Entropy-Driven Phase Separation of a Nominally Athermal Model Polymer/Solvent Solution
Date Issued
2000-09-15
Date
2000-09-15
Author(s)
DOI
892214E002006
Abstract
The Phase equilibrium behaviors of a
nearly athermal polymer/solvent solution are
studied by using the Monte Carlo method. It
is found that as temperature increases, the
free volume differences between solvent
molecules and polymer chains become larger.
To a certain temperature, which is the so
called Lower Critical Solution Temperature (LCST) the entropic effect dominates over
the enthalpic effect, thus phase separation
occurs. We have also found that phase
separation takes place at lower temperature
for longer chain polymer solution. By
comparing the phase envelope of polymer of
the same chain length but at different
pressure, LCST increases as pressure
increases. We have also applied the SAFT
theory to study the phase behavior and it is
found to be able to give qualitatively good
predictions.
Subjects
Athermal Polymer/solvent
Solution
Solution
Monte Carlo Method
LCST
Entropic
Phase
Seperation
Seperation
SAFT theory
Publisher
臺北市：國立臺灣大學化學工程學系暨研究所
Type
report
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