Abstract
The local segmental dynamics at hypersonic frequencies of the copolymer far from the microphase separation and in the homopolymers is compared with recent photon correlation spectroscopy (PCS) measurements. The combined results of the PCS and Brillouin scattering measurements indicate that a difference in segmental mobilities and shape parameters β (with regard to the conventional Kohlrausch-Williams-Watts equation) may explain the behavior of the diblock copolymer near and above Tg
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