Two glass transitions in miscible polymer blends?

Journal Article · Sat Jun 28 00:00:00 EDT 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4884123· OSTI ID:22311396

Dudowicz, Jacek; Freed, Karl F. ^[1]; Douglas, Jack F. ^[2]

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1. The James Franck Institute and the Department of Chemistry, The University of Chicago, Chicago, Illinois 60637 (United States)
2. Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)

In contrast to mixtures of two small molecule fluids, miscible binary polymer blends often exhibit two structural relaxation times and two glass transition temperatures. Qualitative explanations postulate phenomenological models of local concentration enhancements due to chain connectivity in ideal, fully miscible systems. We develop a quantitative theory that explains qualitative trends in the dynamics of real miscible polymer blends which are never ideal mixtures. The theory is a synthesis of the lattice cluster theory of blend thermodynamics, the generalized entropy theory for glass-formation in polymer materials, and the Kirkwood-Buff theory for concentration fluctuations in binary mixtures.

• OSTI ID: 22311396
• Journal Information: Journal of Chemical Physics, Vol. 140, Issue 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BINARY MIXTURES
ENTROPY
FLUCTUATIONS
GLASS
MOLECULES
POLYMERS
SYNTHESIS
THERMODYNAMICS
TRANSITION TEMPERATURE