Dynamics of polystyrene-block-poly(methylmethacrylate) (PS-b-PMMA) diblock copolymers and PS/PMMA blends: A dielectric study

► Identified α and β relaxation processes and a conductivity term of samples. ► Compared physical parameters extracted from the Havriliak-Negami model. ► The α relaxation process is greatly suppressed in PS-b-PMMA copolymers. ► The αβ merging process was observed only in the PMMA sample by extrapolation. ► The DC transport mechanism is associated with the motions of polymeric chains.