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- W2021961408 abstract "The effects of pre-drawn morphology of melt-spun poly (ethylene terephthalate) (PET) fibres, induced by treatment at room temperature with mixtures of dimethylformamide (DMF) and water, on the two-stage drawing behaviour have been studied. The maximum achievable draw ratio (DRmax) in the first-stage cold drawing was dependent on the treatment time and the fraction of water in the mixtures. The fibres treated by ̌ 919 (vol) DMF/water mixtures showed depression of the glass transition temperature. However, the DRmax of the treated fibres was not improved appreciably. When the fibres were treated by a 955 mixture for 3 min, the fibres could be cold drawn up to a significantly higher draw ratio of 7. The value was about 30% higher than that for untreated fibres. The improved cold drawability of the treated fibres was explained by the presence of small and/or less perfect crystals induced by the mixture. With decreasing fraction of water and increasing treatment time, the treated fibres became brittle, which reduced the deformability at room temperature. This was primarily due to increased crystal perfection and surface roughening appeared on the fibre surface. By the second-stage hot drawing at 230°C, the initially cold-drawn fibres with the highest DRmax of 7 could be drawn up to a total draw ratio of 11.5. These highly drawn fibres showed tensile moduli and strengths of ̌ 225 and ̌ 10 g/d, respectively." @default.
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- W2021961408 date "1992-01-01" @default.
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- W2021961408 title "Effect of pre-drawn morphology induced by treatment with mixtures of dimethylformamide and water on drawing of poly (ethylene terephthalate) fibres" @default.
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- W2021961408 doi "https://doi.org/10.1016/0032-3861(92)91140-w" @default.
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