Order-to-disorder transition in a diblock copolymer studied at ultrasonic frequencies with a shear wave reflection technique

I. Alig*, S. Tadjbakhsch, Nikolaos Hadjichristidis, G. Floudas

*Corresponding author for this work

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2 Scopus citations


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 (f = 5 MHz) being much higher than the critical frequency ωc 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.

Original languageEnglish (US)
Pages (from-to)291-296
Number of pages6
JournalEurophysics Letters
Issue number3
StatePublished - Nov 1 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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