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- W2000504104 abstract "Studies have been made of the effect of physical ageing at 23°C on the short-term creep of polycarbonate (PC), poly(butylene terephthalate) (PBT) and high density polyethylene (HDPE) at creep times between 10−8 and 105 s. The age state of each polymer sample was specified by the elapsed time te at 23°C between quenching from a temperature at which the structure is close to equilibrium with respect to the α-retardation process and the start of a creep test. With increasing age, a small decrease was evident in the relaxed compliance DRβ of the β-retardation process in each polymer and relationships between DRβ and te were derived from quantitative analyses of the data. For the amorphous PC and semicrystalline PBT, this decrease could reflect a slight reduction in the number of groups participating in the localized secondary process. It also appeared for PC and PBT that the average retardation time for the glass-rubber α-process increased with te, with negligible change in the shape of the retardation time distribution or the magnitude of the α-retardation. For HDPE, the small decrease in DRβ with increasing te for the glass-rubber β-process is similar to that found for polypropylene and might involve conformational changes of amorphous tie-molecules. The results for HDPE deviate from the predictions of Struik's model of ageing in semicrystalline polymers and suggest that, for the crystal-related α-process, changes in retardation magnitude or shape of the retardation time distribution may occur with increasing age." @default.
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- W2000504104 title "Physical ageing and short-term creep in amorphous and semicrystalline polymers" @default.
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- W2000504104 doi "https://doi.org/10.1016/0032-3861(90)90209-h" @default.
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