Most polymer blends are phase-segregated, and among thermodynamically miscible blends, only a few have components that are both rubbers. Since the equilibrium morphology of miscible blends is homogeneous down to the segmental level, they can exhibit unusual properties. The focus of this chapter is the phenomena seen in miscible rubbery blends that have no counterpart in neat materials. These properties include dynamic heterogeneity, anomalous concentration dependences, and the emergence of new relaxation peaks. There are a number of models for the segmental dynamics of blends, and these are reviewed. Selected aspects of phase-separated blends are discussed briefly at the chapter’s end.
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