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Structure Relaxation and Metastable States at the Microphase Separation Transition in Diblock Copolymers: Experiments with Time-Resolved Small-Angle X-ray Scattering

Stühn, B. and Vilesov, A. and Zachmann, H. G. (1994):
Structure Relaxation and Metastable States at the Microphase Separation Transition in Diblock Copolymers: Experiments with Time-Resolved Small-Angle X-ray Scattering.
In: Macromolecules, pp. 3560-3565, 27, (13), [Article]

Abstract

The kinetics of the microphase separation transition in a diblock copolymer of polystyrene/polyisoprene was studied with time-resolved small-angle X-ray scattering. Using synchrotron radiation it was possible to determine the structure factor in time intervals of 10 s. The relaxation of the structure factor after temperature jumps within the disordered regime was found to be wave vector dependent in accordance with Cahn-Hilliard theory. For quenches from the disordered into the ordered state an additional, slow process was found which consists mainly of a decrease in the width of the first-order reflection. It is interpreted as the perfectioning of the lamellar order. Whereas the corresponding relaxation time had been found to decrease strongly with supercooling for shallow quenches, it is found to increase again for deeper quenches.

Item Type: Article
Erschienen: 1994
Creators: Stühn, B. and Vilesov, A. and Zachmann, H. G.
Title: Structure Relaxation and Metastable States at the Microphase Separation Transition in Diblock Copolymers: Experiments with Time-Resolved Small-Angle X-ray Scattering
Language: English
Abstract:

The kinetics of the microphase separation transition in a diblock copolymer of polystyrene/polyisoprene was studied with time-resolved small-angle X-ray scattering. Using synchrotron radiation it was possible to determine the structure factor in time intervals of 10 s. The relaxation of the structure factor after temperature jumps within the disordered regime was found to be wave vector dependent in accordance with Cahn-Hilliard theory. For quenches from the disordered into the ordered state an additional, slow process was found which consists mainly of a decrease in the width of the first-order reflection. It is interpreted as the perfectioning of the lamellar order. Whereas the corresponding relaxation time had been found to decrease strongly with supercooling for shallow quenches, it is found to increase again for deeper quenches.

Journal or Publication Title: Macromolecules
Volume: 27
Number: 13
Divisions: 05 Department of Physics
05 Department of Physics > Institute for condensed matter physics
Date Deposited: 26 Feb 2010 13:59
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