Effect of the Molecular Weight of AB Diblock Copolymers on the Lamellar Orientation in Thin Films: Theory and Experiment

Igor I. Potemkin, Peter Busch, Detlef-M Smilgies, Dorthe Posselt, Christine M. Papadakis

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We propose a theoretical explanation of the parallel and perpendicular lamellar orientations in free surface films of symmetric polystyrene-block-polybutadiene diblock copolymers on silicon substrates (with a native SiOx layer). Two approaches are developed: A correction to the strong segregation theory and a qualitative analysis of the intermediate segregation regime. We show that the perpendicular orientation of the lamellae formed by the molecules of high molecular weight is stabilized by A-B interfacial interactions. They are weaker in the case of the perpendicular orientation of the lamellae, whereas the surface tension coefficient of the A-B interface decreases with the increase of the molecular weight.
TidsskriftMacromolecular Rapid Communications
Udgave nummer5
Sider (fra-til)579-584
Antal sider6
StatusUdgivet - 2007

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