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Asymmetric diblock copolymers-phase behaviour and kinetics of structure formation

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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.

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Authors and Affiliations

  1. Fakultät für Physik, Hermann-Herder-Straße 3, 79104, Freiburg, Germany

    M. Schwab & B. Stühn

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  1. M. Schwab
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  2. B. Stühn
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Schwab, M., Stühn, B. Asymmetric diblock copolymers-phase behaviour and kinetics of structure formation. Colloid Polym Sci 275, 341–351 (1997). https://doi.org/10.1007/s003960050091

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  • DOI: https://doi.org/10.1007/s003960050091

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