Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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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)
  • Published : 2009.12.31
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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

References

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