Viscoelastic properties of a butadiene-styrene block copolymer. A mechanical model

The manifestations of microheterogeneous structure in the viscoelastic properties of a butadiene-styrene copolymer of AB type with lamellar superstructure were investigated. The temperature dependences of the shear elasticity components, G′ and loss G″, were measured at 0·5 Hz. A mechanical model for the calculation of G∗(T) is presented. An interpretation of the “maximum smearing” effect in the G″(T) dependence between the glass temperatures of polybutadiene and polystyrene is proposed.