Abstract
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 and the temperature range to , where is the blend glass transition. The spectra, obtained directly in the time domain, are very broad with stretching parameters . The relaxation times vary considerably over the spatial range considered however at none of the values do we see two distinct relaxation times. At small spatial scales relaxations are still detectable at temperatures far below . The temperature dependence of these relaxation times strongly resembles the -relaxation process observed in pure PMMA.
3 More- Received 18 May 2005
DOI:https://doi.org/10.1103/PhysRevE.72.031809
©2005 American Physical Society