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)
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1992 |
| Autor(en): | Stühn, B. ; Mutter, R. ; Albrecht, T. |
| Art des Eintrags: | Bibliographie |
| Titel: | Direct Observation of Structure Formation at the Temperature-Driven Order-To-Disorder Transition in Diblock Copolymers |
| Sprache: | Englisch |
| Publikationsjahr: | März 1992 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Europhysics Letters |
| Jahrgang/Volume einer Zeitschrift: | 18 |
| (Heft-)Nummer: | 5 |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik |
| Hinterlegungsdatum: | 26 Feb 2010 13:36 |
| Letzte Änderung: | 05 Mär 2013 09:32 |
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