| Tsarkova, L.; Horvat, A.; Krausch, G.; Zvelindovsky, A.V.; Sevink, G.; Magerle, R.: Defect Evolution in Block Copolymer Thin Films via Temporal Phase Transitions, Langmuir, 22(19), 8089-8095 (2006), doi:10.1021/la0613530 [Link] | |
| Abstract: We study the details of the defect dynamics in thin films of a cylinder forming polystyrene-block-polybutadiene (SB) diblock copolymer melt. The high temporal resolution of in-situ scanning force microscopy (SFM) uncovers elementary dynamic processes of structural rearrangements on time scales not accessible so far. Short term interfacial undulations and the formation of transient phases (spheres, perforated lamellae, and lamellae) are observed. We demonstrate that the well-known structural defects annihilate by short term phase transitions into what may be considered as excited states. These temporary phase transitions are reproduced in simulations based on dynamic density functional theory. We discuss the role of the observed structural evolution in the context of the equilibrium phase behavior in SB thin films. |
Sonderforschungsbereich 481
Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern
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