Schwab, M. ; Stühn, B. (1997)
Asymmetric diblock copolymers - Phase behaviour and kinetics of structure formation.
In: Colloid and Polymer Science, 275 (4)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The structure of a series of three molecular weights of diblock copolymers polystyrene/b-isoprene with 11% volume fraction of polystyrene and low polydispersity has been investigated using small angle X-ray scattering (SAXS). In between the disordered and the BCC ordered state a micellar state with liquid-like order was found. The transition between these states was investigated in a temperature-driven experiment. Whereas the micelles appear gradually with lowering temperature the formation of the BCC ordered state occurs discontinuously at a well-defined temperature. Detailed analysis of the scattering profiles provides access to the micellar size and distance in the liquid-like as well as in the BCC state. The kinetics of the ordering transition was studied using time-resolved SAXS after temperature jumps from the liquid-like to the BCC state. The growth of the micelles and their ordering on the periodic lattice were found to occur on clearly separated time scales.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1997 |
| Autor(en): | Schwab, M. ; Stühn, B. |
| Art des Eintrags: | Bibliographie |
| Titel: | Asymmetric diblock copolymers - Phase behaviour and kinetics of structure formation |
| Sprache: | Englisch |
| Publikationsjahr: | April 1997 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Colloid and Polymer Science |
| Jahrgang/Volume einer Zeitschrift: | 275 |
| (Heft-)Nummer: | 4 |
| Kurzbeschreibung (Abstract): | The structure of a series of three molecular weights of diblock copolymers polystyrene/b-isoprene with 11% volume fraction of polystyrene and low polydispersity has been investigated using small angle X-ray scattering (SAXS). In between the disordered and the BCC ordered state a micellar state with liquid-like order was found. The transition between these states was investigated in a temperature-driven experiment. Whereas the micelles appear gradually with lowering temperature the formation of the BCC ordered state occurs discontinuously at a well-defined temperature. Detailed analysis of the scattering profiles provides access to the micellar size and distance in the liquid-like as well as in the BCC state. The kinetics of the ordering transition was studied using time-resolved SAXS after temperature jumps from the liquid-like to the BCC state. The growth of the micelles and their ordering on the periodic lattice were found to occur on clearly separated time scales. |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik |
| Hinterlegungsdatum: | 27 Feb 2010 12:10 |
| Letzte Änderung: | 05 Mär 2013 09:32 |
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