Collective motion in Poly(ethylene oxide)/poly(methylmethacrylate) blends

Bela Farago, Chunxia Chen, Janna K. Maranas, Sudesh Kamath, Ralph H. Colby, Anthony J. Pasquale, Timothy E. Long

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36 Scopus citations


We present neutron spin echo and structural measurements on a perdeutereted miscible polymer blend: poly(ethylene oxide)[PEO]/poly(methyl methacrylate)[PMMA], characterized by a large difference in component glass transition temperatures and minimal interactions. The measurements cover the q range 0.35 to 1.66-1 and the temperature range Tg-75 to Tg+89K, where Tg is the blend glass transition. The spectra, obtained directly in the time domain, are very broad with stretching parameters β∼0.30. The relaxation times vary considerably over the spatial range considered however at none of the q values do we see two distinct relaxation times. At small spatial scales relaxations are still detectable at temperatures far below Tg. The temperature dependence of these relaxation times strongly resembles the β-relaxation process observed in pure PMMA.

Original languageEnglish (US)
Article number031809
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Issue number3
StatePublished - Sep 1 2005

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics


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