Influence of initial order on the microscopic mechanism of electric field induced alignment of block copolymer microdomains
Langmuir. Bd. 21. H. 25. Washington, D.C.: American Chemical Soc. 2005 S. 11974 - 11980
Erscheinungsjahr: 2005
ISBN/ISSN: 0743-7463
Publikationstyp: Zeitschriftenaufsatz
Sprache: Englisch
Doi/URN: 10.1021/la051346w
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Inhaltszusammenfassung
We investigate the mechanism of microdomain orientation in concentrated block copolymer solutions exposed to a dc electric field by in situ synchrotron small-angle X-ray scattering (SAXS), As a model system, we use concentrated solutions of a lamellar polystyrene-b-polyisoprene block copolymer in toluene, We rind that both the microscopic mechanism of reorientation and the kinetics of the process strongly depend on the initial degree of order in the system. In a highly ordered lamellar system...We investigate the mechanism of microdomain orientation in concentrated block copolymer solutions exposed to a dc electric field by in situ synchrotron small-angle X-ray scattering (SAXS), As a model system, we use concentrated solutions of a lamellar polystyrene-b-polyisoprene block copolymer in toluene, We rind that both the microscopic mechanism of reorientation and the kinetics of the process strongly depend on the initial degree of order in the system. In a highly ordered lamellar system with the lamellae being aligned perpendicular to the electric field vector, only nucleation and growth of domains is possible as a pathway to reorientation and the process proceeds rather slowly. In less ordered samples, grain rotation becomes possible as an alternative pathway, and the process proceeds considerably faster. The interpretation of our finding is strongly corroborated by dynamic self-consistent field simulations.» weiterlesen» einklappen
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DDC Sachgruppe:
Physik
