Glassy dynamics of polysulfone by quasielastic neutron scattering: from 10−13 to 10-9s

We have studied the dynamics of phenylene rings in polysulfone with deuterated methyl groups (PSFd6) by means of neutron scattering in a wide energy window combining time-of-flight and backscattering experiments. Fast oscillations of increasing amplitude with temperature and π-flips are identified for phenylene ring motion. These motions present a broad distribution of characteristic times extending over several orders of magnitude, and thus, contributing to different windows.We acknowledge “Donostia International Physics Center” and the support of the following research projects: MAT 20001/0070 and 9/UPV00206.215-13568/2001. S. Arrese-Igor acknowledges the grant of The Basque Country Government.Peer reviewe