Résumé : This article aims to explore the morphologies of polyethylene blends induced by a broad range of SB copolymers. Dual interest is presented. Polybutadiene could initiate the degradation of PE and also allows a deeper insight into the relation between structure of the copolymer and morphology of the blend. Continuous morphologies and co-continuous structures are shown to be favoured by specific conditions. The study of blend morphologies is also accounted for.