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- W1566754469 abstract "The dynamics of the α-relaxation in three glass-forming polymeric systems, poly(vinyl methyl ether) (PVME), poly(vinyl chloride) (PVC), and poly(bisphenol A, 2-hydroxypropylether) (PH) has been studied by means of quasielastic neutron scattering and compared with the results obtained from relaxation techniques. The results indicate that the dynamics of the α-relaxation in a wide timescale shows a clear non-Debye behaviour and can be well described by means of the same spectral shape, which is found to be independent of temperature and momentum transfer ( Q ). Moreover, the Havriliak-Negami characteristic times deduced from the fitting of the experimental data can also be described using only one Vogel-Fulcher functional form. This implies a self-consistent description of the dynamics of the α-relaxation obtained by very different probes. Besides, we found that the Q -dependence of the characteristic times obtained by QENS is given by a power law, τ(Q) ∝ Q − n ( n > 2), n being dependent on the system, and that the Q -behaviour and the non-Debye behaviour are directly correlated. These results have main implications about the physical mechanisms behind the dynamics of the α-relaxation." @default.
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- W1566754469 date "1992-12-01" @default.
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- W1566754469 title "Temperature and momentum transfer dependence of the dynamics of the α-relaxation in polymer melts" @default.
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- W1566754469 doi "https://doi.org/10.1016/0921-4526(92)90040-y" @default.
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