R. Horst and B. A. Wolf

"Phase Diagrams Calculated for Sheared Ternary Polymer Blends"

*Polymer* **1997**, *38*, 4697-4703.

**Abstract:** On the basis of the generalized Gibbs energy of mixing G((gamma)over
dot) (which is the sum of the Gibbs energy for zero shear and the energy the
system stores in steady flow) phase diagrams were calculated as a function of
shear rate (gamma>)over dot for ternary model blends. This modelling uses
simple equations for the description of the stagnant systems (Flory-Huggins)
and for the contributions resulting from flow. Surface and alignment effects
are neglected. A new procedure, which does not require the derivatives of G((gamma)over
dot) with respect to composition, was used to that end. Choosing typical values
for the binary interaction parameters and molar masses, four classes of ternary
systems were studied in greater detail. Under equilibrium conditions, with two
of them there only exist one-phase and two-phase regions in the temperature
range of interest. At least one three-phase domain occurs with the other two
types of ternary mixtures. In addition to all effects observed for binary systems,
the following new phenomena were calculated: (i) twofold disappearance of closed
loops of immiscibility and twofold reappearance; (ii) creation and annihilation
of three phase areas; and (iii) creation and annihilation of islands of homogeneity
in the centre of the ternary phase diagram.

preprint number: 160