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Viscoelastic Behavior of Rubbery Materials$
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C. Michael Roland

Print publication date: 2011

Print ISBN-13: 9780199571574

Published to Oxford Scholarship Online: September 2011

DOI: 10.1093/acprof:oso/9780199571574.001.0001

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Blends

Blends

Chapter:
(p.236) 7 Blends
Source:
Viscoelastic Behavior of Rubbery Materials
Author(s):

C. M. Roland

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199571574.003.0007

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.

Keywords:   blends, mixtures, dynamic heterogeneity, concentration fluctuations, phase-segregation, phase-separated blends, curative distribution, filler distribution, models for blend dynamics

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