| Issue |
Europhys. Lett.
Volume 52, Number 3, November I 2000
|
|
|---|---|---|
| Page(s) | 291 - 296 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00437-y | |
| Published online | 01 September 2002 | |
Order-to-disorder transition in a diblock copolymer studied at ultrasonic frequencies with a shear wave reflection technique
1
Deutsches Kunststoff-Institut Darmstadt Schloßgartenstr.
6, D-64289 Darmstadt, Germany
2
Foundation for Research and Technology-Hellas (FORTH)
Institute of Electronic Structure and Laser P.O. Box 1527, 71110 Heraklion,
Crete, Greece
Received:
5
June
2000
Accepted:
8
September
2000
The order-to-disorder transition (ODT) has been studied in
a poly(styrene-b-isoprene) diblock copolymer with conventional rheology and
an ultrasonic shear wave reflection technique. Despite the operational frequency
in the latter experiment (
) being much higher than the critical
frequency
, the storage modulus exhibits a discontinuous increase at
the same temperature at which in conventional rheology a discontinuous
decrease is obtained. This results from a change in the mixing law at the
ODT. The method constitutes a non-destructive probe of the viscoelastic
properties of “soft” materials in the vicinity of phase transitions.
PACS: 61.41.+e – Polymers, elastomers, and plastics / 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems / 62.80.+f – Ultrasonic relaxation
© EDP Sciences, 2000
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