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Effect of Polydispersity on the Phase Behavior of Polymer Blends
Author(s) -
Lo ChiehTsung,
Seifert Soenke,
Thiyagarajan Pappannan,
Narasimhan Balaji
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400574
Subject(s) - dispersity , miscibility , materials science , radius of gyration , phase diagram , phase (matter) , polymer blend , polymer , polymer chemistry , flory–huggins solution theory , tacticity , upper critical solution temperature , polyethylene , thermodynamics , composite material , lower critical solution temperature , chemistry , physics , organic chemistry , polymerization , copolymer
Summary: The effect of polydispersity on polymer blend phase behavior is studied by in situ small‐angle X‐ray scattering. In a polydisperse polyethylene (PE)/isotactic poly(propylene) (iPP) blend, the enthalpic portion of the interaction parameter is greater than that of a corresponding blend with lower polydispersity. This is attributed to the presence of long chains, which provide a higher interaction energy and packing constraint, reducing the system miscibility. As expected, the radius of gyration is higher in the system with higher polydispersity.Comparison of phase diagrams of the iPP/PE system used in this study (thin lines) with that obtained from the literature (thick lines). The solid lines represent binodals and the dashed lines are spinodals.