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We present the morphological phase map of semicrystalline poly(butadiene)-b-poly(ethylene oxide) (PB-b-PEO) diblock copolymers (BCP) in dilute n-heptane solutions. The solutions of the diblock copolymer have been quenched from 70 °C, that is above the melting temperature Tm of the PEO block, following two thermal pathways: (A) by direct immersion into liquid nitrogen and (B) by quenching to the crystallization temperature Tc of the PEO block. Scanning force microscopy (SFM) and transmission electron microscopy (TEM) allowed imaging of the dried crystalline morphologies, whereas in solution the micelles have been visualized by cryogenic transmission electron microscopy (cryo-TEM). The apparent hydrodynamic radii of the micellar structures in solution were determined by dynamic light scattering (DLS). The effects of the block length and block ratio, and the influence of the thermal history on the …