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

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

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. ; Mutter, R. ; Albrecht, T.
Type of entry: Bibliographie
Title: Direct Observation of Structure Formation at the Temperature-Driven Order-To-Disorder Transition in Diblock Copolymers
Language: English
Date: March 1992
Journal or Publication Title: Europhysics Letters
Volume of the journal: 18
Issue Number: 5
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.

Divisions: 05 Department of Physics > Institute for condensed matter physics (2021 merged in Institute for Condensed Matter Physics)
05 Department of Physics
Date Deposited: 26 Feb 2010 13:36
Last Modified: 05 Mar 2013 09:32
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