Asymmetric diblock copolymers-phase behaviour and kinetics of structure formation |
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Authors: | M Schwab B Stühn |
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Institution: | 1. Fakult?t für Physik, Hermann-Herder-Stra?e 3, 79104, Freiburg, Germany
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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.
Received: 12 September 1996 Accepted: 2 December 1996 |
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Keywords: | Block copolymers disorder-to-order transition micelles BCC order kinetics of structure formation small angle X-ray scattering |
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