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Pressure dependence of the order-to-disorder transition in polystyrene/polyisoprene and polystyrene/poly(methylphenylsiloxane) diblock copolymers

Steinhoff, B. and Rullmann, M. and Wenzel, M. and Junker, M. and Alig, I. and Oser, R. and Stühn, B. and Meier, G. and Diat, O. and Bosecke, P. and Stanley, H. B. (1998):
Pressure dependence of the order-to-disorder transition in polystyrene/polyisoprene and polystyrene/poly(methylphenylsiloxane) diblock copolymers.
In: Macromolecules, pp. 36-40, 31, (1), [Article]

Abstract

The pressure dependence of the order-to-disorder transition in a polystyrene/polyisoprene (PS/PI) (M = 17000) and a polystyrene/poly(methylphenylsiloxane) (PS/PMPS) (M = 29600) diblock copolymer of symmetric composition has been studied using small-angle X-ray scattering. The order-disorder transition is investigated with a temperature resolution of 0.1 K. The transition can be resolved in a two-step process with a roughening of the interface preceding the breakdown of the lamellar order. For both systems a pressure-induced ordering transition is observed at constant temperature. The application of small pressures leads to a decrease of the transition temperature for both systems. High pressure shows the opposite effect. The minimum transition temperature for the PS/PI is located around p = 8 bar.

Item Type: Article
Erschienen: 1998
Creators: Steinhoff, B. and Rullmann, M. and Wenzel, M. and Junker, M. and Alig, I. and Oser, R. and Stühn, B. and Meier, G. and Diat, O. and Bosecke, P. and Stanley, H. B.
Title: Pressure dependence of the order-to-disorder transition in polystyrene/polyisoprene and polystyrene/poly(methylphenylsiloxane) diblock copolymers
Language: English
Abstract:

The pressure dependence of the order-to-disorder transition in a polystyrene/polyisoprene (PS/PI) (M = 17000) and a polystyrene/poly(methylphenylsiloxane) (PS/PMPS) (M = 29600) diblock copolymer of symmetric composition has been studied using small-angle X-ray scattering. The order-disorder transition is investigated with a temperature resolution of 0.1 K. The transition can be resolved in a two-step process with a roughening of the interface preceding the breakdown of the lamellar order. For both systems a pressure-induced ordering transition is observed at constant temperature. The application of small pressures leads to a decrease of the transition temperature for both systems. High pressure shows the opposite effect. The minimum transition temperature for the PS/PI is located around p = 8 bar.

Journal or Publication Title: Macromolecules
Volume: 31
Number: 1
Divisions: 05 Department of Physics
05 Department of Physics > Institute for condensed matter physics
Date Deposited: 27 Feb 2010 12:36
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