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- W2022683934 abstract "During recent years there has been a great deal of experimental effort in the study of the relaxation behaviour above the glass-liquid transition of glass-forming systems. This behaviour is directly related to the dynamics of such systems in the supercooled liquid-like equilibrium state. Therefore it is related to the glass-liquid transition phenomena. In the special case of glass-forming polymeric systems, the situation is much more complex due to the fact that the glass-liquid transition is spread-out into the glass-rubber-liquid transition. Then, the relaxation behaviour in this temperature range shows two main steps, the α-relaxation and the terminal zone. The main results obtained to date can be summarized as follows. The relaxation response usually shows a non-exponential behaviour (time or frequency domain). Moreover, the corresponding timescale displays a non-Arrhenius temperature dependence. However, in spite of these results, several questions still remain unsolved or partially solved. Some of them are: the lack of thermorheological simplicity of time-temperature superposition of viscoelastic data in the glass-rubber-liquid transition range; the relationship among the dynamic behaviours obtained from different probes; can the dynamics of the α-relaxation be described in a wide time range (1–10−10 s) by using the same temperature dependence of the characteristic timescale and the same shape parameters?. Another interesting question is how the α-relaxation behaviour, corresponding to a polymer in the rubber state, changes when such a system gradually becomes a glass by cooling through the rubber-glass transition. The aim of this paper is to review the work recently made in this line, not only by the present group but also by other groups working in this area." @default.
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- W2022683934 date "1991-06-01" @default.
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- W2022683934 title "α-relaxation and molecular dynamics in glass-forming polymeric systems" @default.
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- W2022683934 doi "https://doi.org/10.1016/0022-3093(91)90693-z" @default.
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