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Effect of Pressure on Polymer Blend Miscibility: A Temperature-Pressure Superposition



M Rabeony, D J. Lohse, R T. Garner, S J. Han, W W. Graessley, Kalman D. Migler


In recent years there has been an increase in the effect of pressure on the miscibility of polymers1-4. One reason is the need for such data to more fully understand polymer miscibility in relation to the various proposed theories and equations of state. Another is the realization that such pressure effects could be important in many situations where such blends are used, e. g., when mixing a blend in an extruder or in forming articles from a blend by injection molding. These needs have led to the development of pressure cells that can be used with both light and neutron scattering so that the phase behavior and interaction strengths of blends can be measured2.5. In past work, we have found a wide range of phase behavior at atmospheric pressure in saturated hydrocarbons blends6-11. As several outstanding problems remain unexplained in these blends, we decided to investigate the dependence of pressure: an independent thermodynamic variable. In this note, we wish to point out that in certain simple cases, the pressure and temperature dependence of the interaction parameter collapse as function of density.


blend, polymer, pressure, small angle neutron scattering


Rabeony, M. , Lohse, D. , Garner, R. , Han, S. , Graessley, W. and Migler, K. (1998), Effect of Pressure on Polymer Blend Miscibility: A Temperature-Pressure Superposition, Macromolecules (Accessed June 25, 2024)


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Created January 13, 1998, Updated October 12, 2021