Interpretation of anomalous momentum transfer dependences of local chain motion of polymers observed by quasielastic incoherent neutron scattering experiments

Abstract

It was shown that the anomalous Q K dependence of Δω, the full width at half-maximum, and the non-Lorentzian line shape of S inc (Q,ω) follow as natural consequences of the coupling model. The model predicts correctly the variation of K from polymer to polymer. It also draws attention to a strong correlation between the value of K and the steepness of the variation of the local segmental relaxation time with normalized temperature variables (T-T g )/T g or T g /T