Collaborative Research Center 481: Publications: Substrate induced phase transitions in thin ...

Tsarkova, L.; Knoll, A.; Krausch, G.; Magerle, R.: Substrate induced phase transitions in thin films of cylinder forming block copolymer melts, Macromolecules, 39(10), 3608-3615 (2006), doi:10.1021/ma060224n [Link]

Abstract:
Terrace formation and morphological behavior in thin films of polystyrene-block-polybutadiene block copolymer have been studied on two chemically different substrates by means of scanning force microscopy. Cylinders parallel to the film plane (C║) are found on weakly interacting substrates in up to five layer thick films. A bottom layer of half-cylinders is stabilized at the substrate. On strongly interacting substrates, the development of the C║ microdomains and nonbulk perforated lamella (PL) and lamella (L) phases depends on the local film thickness. The sequence of structures at transition thickness (in between the steps) suggests a few percent increase of the characteristic microdomain spacing in the order C║ - PL L. Comparison of the interlayer distances on the two types of substrates points to lamella-like structures in bulk of the films on strongly interacting surfaces.

Sonderforschungsbereich 481

Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern

There are additional file downloads belonging to this publication