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

✍ Scribed by Igor I. Potemkin; Peter Busch; Detlef-M. Smilgies; Dorthe Posselt; Christine M. Papadakis

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
158 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

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 SiO~x~ 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.

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