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Correlation between non-Debye behavior and Q behavior of the alpha relaxation in glass-forming polymeric systems.

By means of quasielastic neutron scattering we have shown that the dynamics of the α relaxation on three different polymeric glasses shows a clear non-Debye behavior on a mesoscopic time scale. The spectral shape is found to be independent of temperature and momentum transfer (Q). The characteristic relaxation time follows a power-law Q dependence, τ(Q)∞Q -n (n>2), n being dependent on the system. We found that the Q behavior and the non-Debye behavior are directly correlated. These results have important implications concerning the physical mechanisms behind the dynamics of the α relaxation