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• W2076615064 abstract "We present NMR investigations on m-tricresyl phosphate (m-TCP; 31P NMR) and on polybutadiene (PB; 2H NMR). Relaxation studies have been combined with the analysis of the stimulated echo, and a reorientational correlation function is probed over the entire supercooled regime providing correlation times in the range 10-11 s-10 s. Furthermore, we have performed Raman scattering (RS) experiments on m-TCP and glycerol. Testing predictions of mode coupling theory (MCT), the scaling behaviour observed by RS on m-TCP is well described by MCT for T >Tc with Tc ∼ 260 K. The idea of a change of dynamics at T ∼ Tc is further supported by phenomena which - although not yet emerging from MCT - are revealed by combining results from NMR, RS and neutron scattering. (i) The time scale of reorientational and translational motion separates below Tc (m-TCP). (ii) The stretching parameter of the α-relaxation changes significantly near Tc (m-TCP). (iii) NMR and dielectric relaxation probe a third process which exists only below Tc. This process has all properties of the secondary relaxation discussed by Johari, however, it is well distinguished from the fast β-process analyzed within MCT and observed by RS. Thus, above Tc the dynamics are described by a two-step correlation function with all the features predicted by MCT, whereas below Tc a three-step function holds. As a consequence, a second order parameter appears, and the third process is described in terms of an activated process with a distribution of local environments." @default.
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• W2076615064 date "1993-12-01" @default.
• W2076615064 modified "2023-10-01" @default.
• W2076615064 title "Dynamical phase transition in simple supercooled liquids and polymers - an NMR approach" @default.
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• W2076615064 doi "https://doi.org/10.1016/0378-4371(93)90419-5" @default.
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