Abstract
The segmental dynamics in the microregions of a microphase-segregated poly(styrene-b-methylphenylsiloxane) (P(S-b-MPS)) with M n =59.000 and PS fraction f PS =0.22 were selectively studied by depolarized light scattering and dielectric spectroscopy over the temperature range -20 to +110°C. About 50% of the material was found to partition in PS-rich and PMPS-rich environments with orientational dynamics very similar to that of the pure homopolymers. Below the high T g , the segemental relaxation with in the PS microregion displays a weaker temperature dependence and the relaxation distribution function becomes narrower, as compared to those of PS homopolymer
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