An experimental study of threadline dynamics with emphasis on the effect of molecular weight on the elongational viscosity of melt‐spun poly(ethylene terephthalate)

Hill, Jack W.; Cuculo, John A.

doi:10.1002/app.1974.070180902

Cited by 10 publications

(1 citation statement)

References 23 publications

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“…However, the rheological behavior differences between PLA and PTT melts could affect the elongation activation energy of the two polymers. 29 The PTT component with higher viscosity tends to withstand more tensile stress, leading to a larger solidification stress than that of the PLA component. In the subsequent heat-stretching process, the heat-stretching temperature was fixed at 150 C, close to the melt point of PLA (175 C) and far from that of PTT (225 C).…”

Section: Waxd Analysis Of Pla/ptt Bicomponent and Monocomponent Fibersmentioning

confidence: 99%

Evaluation of the crimp formability of side-by-side PLA/PTT bicomponent fibers

et al. 2021

Textile Research Journal

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To explore the feasibility of developing bio-based elastic fibers, bio-based polylactide (PLA) and polytrimethylene terephthalate (PTT) were selected for fabrication of side-by-side bicomponent fibers using bi-constituent melt-spinning technology. The structure development and performance of PLA/PTT bicomponent fibers was investigated using thermal mechanical analysis, differential scanning calorimetry, and wide-angle X-ray diffraction in order to evaluate the crimp formability of PLA/PTT bicomponent fibers. The PLA and PTT components could form regular boundary structure and exhibit excellent interface compatibility by regulation of the rheological behavior of the two melts. In the fiber forming process, the PTT component in PLA/PTT bicomponent fibers experienced higher tensile stress, and thereby enhanced the crystal and oriented structure development, while the structural evolution of the PLA component was inhibited. The difference in the structure of the two components causes the imbalance force existence in the PLA/PTT fibers, which is the main reason of fiber crimp. In addition, the crimp formability of the PLA/PTT fibers could be enhanced by expanding the shrinkage stress difference between the two components, which could be realized by increasing the PTT ratio in PLA/PTT bicomponent fiber or draw ratio. The maximum crimp extension that could be achieved was 85% for the bicomponent fibers with PLA30/PTT70 ratio at a draw ratio of 4.2.

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Section: Waxd Analysis Of Pla/ptt Bicomponent and Monocomponent Fibersmentioning

confidence: 99%

Evaluation of the crimp formability of side-by-side PLA/PTT bicomponent fibers

et al. 2021

Textile Research Journal

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Melt spinning and draw resonance studies on a poly (α‐methyl styrene/silicone) block copolymer

Blyler¹,

Gieniewski²

1980

Polymer Engineering & Sci

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Fiber spinning experiments were carried out with an α‐methyl styrene/silicone block copolymer under various sets of spinning conditions. The behavior observed was very sensitive to the ambient axial temperature profile employed along the spinline and to the initial melt temperature at the die. By optimizing these parameters, very high draw ratios (>400 to 1) could be achieved. Under less optimum conditions, filament rupture and instabilities such as draw resonance, accompanied by periodic diameter and spinline tension fluctuations, were noted. Tensile stress and axial velocity gradient profiles were obtained along the spinline under a variety of spinning conditions. These profiles, together with an independent: rheological characterization of the polymer, provide insights into the mechanisms giving rise to the various types of behavior observed.

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Effect of pressure on the crystallization of poly(ethylene terephthalate)

Ihm

Cuculo

1982

J. Polym. Sci. Polym. Chem. Ed.

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The effect of pressure on the crystallization of poly(ethylene terephthalate) (PET) was studied. The Instron capillary rheometer was adapted as a high‐pressure/high‐temperature dilatometer to carry on experiments up to 40,000 psi. Isothermal measurements of PET melt density were made with a precision of ±0.5%. Analysis of the kinetics of crystallization of PET melt at high pressures reaffirmed the existence of low Avrami exponents and their noninteger values. To rationalize the crystallization mechanism with the observed low exponents it is proposed that an appropriate increase in pressure would effectively reduce the free volume of a crystallizable substance to a point at which an alteration of the crystallization mechanism or nucleation mode could occur. It is further shown that PET clearly exhibits two different and sharply defined stages of crystallization behavior at pressures above 10,000 psi. Based on the Avrami equation, the fraction of uncrystallized polymer for the initial stage is defined as an empirically determined function of time and pressure. There is good agreement between the predicted and experimental values over the pressure range investigated.

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An experimental study of threadline dynamics with emphasis on the effect of molecular weight on the elongational viscosity of melt‐spun poly(ethylene terephthalate)

Cited by 10 publications

References 23 publications

Evaluation of the crimp formability of side-by-side PLA/PTT bicomponent fibers

Evaluation of the crimp formability of side-by-side PLA/PTT bicomponent fibers

Melt spinning and draw resonance studies on a poly (α‐methyl styrene/silicone) block copolymer

Effect of pressure on the crystallization of poly(ethylene terephthalate)

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