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

In this paper, we report on how interaction strength varies with pressure and temperature for several polyolefin mixtures. We find that the interaction energies that govern phase behavior in polymer blends are only a function of density for UCST polyolefin blends far from a critical point. As a resu...

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Bibliographic Details
Published in:Macromolecules 1998-09, Vol.31 (19), p.6511-6514
Main Authors: Rabeony, M, Lohse, D. J, Garner, R. T, Han, S. J, Graessley, W. W, Migler, K. B
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Summary:In this paper, we report on how interaction strength varies with pressure and temperature for several polyolefin mixtures. We find that the interaction energies that govern phase behavior in polymer blends are only a function of density for UCST polyolefin blends far from a critical point. As a result, the effects of pressure on miscibility can be predicted for such blends from knowledge of the effects of temperature on the interactions combined with PVT data. This remarkable simplification appears to be related to the van der Waals nature of the interactions between saturated hydrocarbons. Density dependence predicts the trends correctly for LCST polyolefin blends, but for these mixtures the interactions depend in a more complex way on T and P.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma980723r