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Asymmetric diblock copolymers - Phase behaviour and kinetics of structure formation

Schwab, M. ; Stühn, B. :
Asymmetric diblock copolymers - Phase behaviour and kinetics of structure formation.
In: Colloid and Polymer Science, 275 (4) pp. 341-351.
[Artikel], (1997)

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.
Titel: Asymmetric diblock copolymers - Phase behaviour and kinetics of structure formation
Sprache: Englisch
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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Colloid and Polymer Science
Band: 275
(Heft-)Nummer: 4
Fachbereich(e)/-gebiet(e): Fachbereich Physik > Festkörperphysik, Condensed matter physics
Fachbereich Physik
Hinterlegungsdatum: 27 Feb 2010 12:10
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