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Phys Rev Lett. 2013 Apr 19;110(16):165701. Epub 2013 Apr 18.

Dynamic heterogeneity in fully miscible blends of polystyrene with oligostyrene.

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Department of Applied Mathematics, University of Crete, and IACM FORTH GR-71110 Heraklion, Greece.


Binary blends of polystyrene with oligostyrene are perfectly miscible (χ=0) yet dynamically heterogeneous. This is evidenced by independent probing of the dipole relaxation perpendicular to the backbone by dielectric spectroscopy and molecular dynamics. The self-concentration model with a single intramolecular length scale qualitatively describes the slower segmental dynamics. A quantitative comparison based on MD, however, requires a composition-dependent length scale. The pertinent dynamic length scale that best describes the slow segmental dynamics in miscible blends relates to both intra- and intermolecular contributions.

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