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Direct Observation of Structure Formation at the Temperature-Driven Order-To-Disorder Transition in Diblock Copolymers

Stühn, B. and Mutter, R. and Albrecht, T. (1992):
Direct Observation of Structure Formation at the Temperature-Driven Order-To-Disorder Transition in Diblock Copolymers.
18, In: Europhysics Letters, (5), pp. 427-432, [Article]

Abstract

The order-to-disorder transition in a nearly symmetric diblock copolymer of polystyrene/poly(cis-1,4)isoprene (M(w) = 15 700) was reproducibly observed in heating and cooling runs using small-angle scattering and rheological measurements. Small-angle X-ray scattering characterizes the ordered structure as consisting of stacks of about 20 lamellae. The transition temperature is T(MST) = 362 K and about 30 K below the spinodal temperature T(s) which is extrapolated from the high-temperature phase. Measurements of the dynamic shear modulus reveal a drastic change of the spectrum of relaxation times at T(MST). The transition is shown to be discontinuous and accompanied by strong concentration fluctuations in accordance with theoretical expectations.

Item Type: Article
Erschienen: 1992
Creators: Stühn, B. and Mutter, R. and Albrecht, T.
Title: Direct Observation of Structure Formation at the Temperature-Driven Order-To-Disorder Transition in Diblock Copolymers
Language: English
Abstract:

The order-to-disorder transition in a nearly symmetric diblock copolymer of polystyrene/poly(cis-1,4)isoprene (M(w) = 15 700) was reproducibly observed in heating and cooling runs using small-angle scattering and rheological measurements. Small-angle X-ray scattering characterizes the ordered structure as consisting of stacks of about 20 lamellae. The transition temperature is T(MST) = 362 K and about 30 K below the spinodal temperature T(s) which is extrapolated from the high-temperature phase. Measurements of the dynamic shear modulus reveal a drastic change of the spectrum of relaxation times at T(MST). The transition is shown to be discontinuous and accompanied by strong concentration fluctuations in accordance with theoretical expectations.

Journal or Publication Title: Europhysics Letters
Volume: 18
Number: 5
Divisions: 05 Department of Physics > Institute for condensed matter physics
05 Department of Physics
Date Deposited: 26 Feb 2010 13:36
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