Dynamics and order-disorder transitions in bidisperse diblock copolymer blends

► Order-disorder transition in AB diblock copolymer mixtures is investigated using DSCFT. ► Microphase separation strength at the ODT increases with PDI in the majority block. ► Microphase separation strength at the ODT decreases with PDI in the minority block. ► Introduction of polydispersity is efficient to control microphase separation strength at the ODT.