Sonderforschungsbereich 481: Publikationen: Defect structure and dynamics in cylinder phase ...

Horvat, A.; Sevink, G.; Zvelindovsky, A.V.; Tsarkova, L.: Defect structure and dynamics in cylinder phase of block copolymers, PMSE Preprints, 99, 686-688 (2008)
Teilprojekte: PMSE preprint
Abstract: In this work, we access structural defects and their short- to long-term dynamics in block copolymer films using SFM, including in-situ measurements at elevated temperatures, and simulations based on the dynamic self-consistent mean field theory (DSCFT). The strength of our approach is that visualized with SFM 2D structures are directly compared with computational simulations which give access to the bulk structure in the interior of the film. We distinguish between classical, modified, specific and grain boundary defect configurations. For each defect type, we address its relative stability, interaction with the other defect types, and its role in the overall structure development. With this approach we discovered strong correlation between the defect structure and the chain mobility, a feature which is not common to nematic liquid crystals. Finally, we discuss the lateral migration of complex and specific structural defects which are involved in the coarsening of the surface patterns.

Sonderforschungsbereich 481