Abstract
The phenyl side groups in both polystyrene and polybutadiene are responsible for two types of relaxational transitions. The first (γ-relaxation) is related to rotational-torsional motions of free phenyl groups (fast relaxation), whereas the second (μ-relaxation) is related to the decay and recombination of physical cross-links formed as a result of the coupling of phenyl groups (slow relaxation).
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