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Dynamic heterogeneity in fully miscible blends of polystyrene with oligostyrene


, : Dynamic heterogeneity in fully miscible blends of polystyrene with oligostyrene. Physical Review Letters 110(16): 165701-165701

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.

US$19.90

PMID: 23679622

DOI: 10.1103/PhysRevLett.110.165701


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