We study the morphology of a thin film made of a hybrid amorphous/side chain liquid crystalline diblock copolymer, in which the amorphous polymer is similar to the backbone of the liquid crystalline polymer. Microphase separation in the smectic A phase leads to a terraced film made of alternating amorphous and smectic layers, both parallel to the substrate. This new lamellar morphology differs from the bulk ordering where minimization of the block-block interfacial energy results in an orthogonal arrangement. We discuss the stability of such a lamellar structure in the film by considering the influence of the surface field on the internal diblock specific interactions.

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Journal Macromolecules
Sentenac, D, Demirel, A. L, Lub, J, & de Jeu, W. H. (1999). A new lamellar morphology of a hybrid amorphous/liquid crystalline block copolymer film. Macromolecules, 32, 3235–3240.