Abstract
Hierarchical lamellae self‐assembled from linear multiblock copolymers in thin films are investigated by self‐consistent field theory. The thin films are confined between two parallel substrates. The confinement strategy allows generating hierarchical microstructures with various numbers and different orientations of small‐length‐scale lamellae. Effects of film thickness and surface affinity on the structures are studied. It is found that not only the period of the large‐ and small‐length‐scale lamellae but also the orientation of small‐length‐scale lamellae relative to large‐length‐scale lamellae can be tuned by varying the film thickness. Moreover, the structures of the hierarchical lamellae can be tailored by changing the surface affinity. Through analyzing free energies of various lamellae, phase diagrams are mapped out. The present work could provide guidance for fabricating hierarchical microstructures in a controllable way.
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