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Component dynamics in miscible polymer blends: A review of recent findings  

Watanabe, Hiroshi (Institute for Chemical Research, Kyoto University)
Urakawa, Osamu (Department of Macromolecular Science, Faculty of Science Osaka University)
Publication Information
Korea-Australia Rheology Journal / v.21, no.4, 2009 , pp. 235-244 More about this Journal
Abstract
Miscible polymer blends still have heterogeneity in their component chain concentration in the segmental length scale because of the chain connectivity (that results in the self-concentration of the segments of respective chains) as well as the dynamic fluctuation over various length scales. As a result, the blend components feel different dynamic environments to exhibit different temperature dependence in their segmental relaxation rates. This type of dynamic heterogeneity often results in a broad glass transition (sometimes seen as two separate transitions), a broad distribution of the local (segmental) relaxation modes, and the thermo-rheological complexity of this distribution. Furthermore, the dynamic heterogeneity also affects the global dynamics in the miscible blends if the component chains therein have a large dynamic asymmetry. Thus, the superficially simple miscible blends exhibit interesting dynamic behavior. This article gives a brief summary of the features of the segmental and global dynamics in those blends.
Keywords
miscible polymer blends; dynamic heterogeneity; self concentration; segmental relaxation; global relaxation; thermo-rheological behavior;
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