High-Strength PET Fibers Produced by Conjugated Melt Spinning and Laser Drawing

Nakata, Kazuhiro; F, Nakamura; Ohkoshi, Yutaka; Gotoh, Yasuo; Nagura, Masanobu; Hamano, A.; Takada, S.; Kikutani, Takeshi

doi:10.3139/217.2573

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The resulting fibers possess a uniform network structure, which leads to the improved tensile strength of the maximally drawn fibers [2]. There have been similar trials for producing high-strength fibers, collectively referred to as "melt structure control", which formed uniform molecular network structures by controlling the melt spinning process [2][3][4][5][6][7][8][9]. Fiber structure development after neck drawing has been observed for PET [10][11][12][13]18], polyethylene naphthalate (PEN) [14], polypropylene [15], polyphenylene sulfide [16], and polybutylene terephthalate (PBT) [17] in wide-angle X-ray diffraction (WAXD) and small-angle Xray scattering (SAXS) images captured with synchrotron X-rays at SPring-8.…”

Section: Introductionmentioning

confidence: 99%

Effect of melt spinning conditions on the fiber structure development of polyethylene terephthalate

Tomisawa

Ikaga

Kim

et al. 2017

Polymer

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The effects of spinning conditions on fiber properties are not well explained by the fiber structures because the birefringence, crystallinity, and SAXS patterns are often similar. In this study, the effects on the fiber structure development of polyethylene terephthalate after necking was analyzed by simultaneous WAXD/SAXS measurements. An X-shaped SAXS pattern was observed for all fibers drawn at the minimum draw ratio. In contrast, by drawing under a drawing stress of 100 MPa, the strong diffraction of the smectic phase and an obviously larger long period less than 1 ms after necking were observed for fibers spun at 500-1500 m/min, while almost no smectic phase was observed for fibers spun at 2000 m/min. A higher crystallization rate and clear draw ratio dependence of crystallization rate were also observed for the fiber spun at 2000 m/min. The clear differences in structure development can explain their differences in tensile strength and thermal shrinkage.

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Section: Introductionmentioning

confidence: 99%

Effect of melt spinning conditions on the fiber structure development of polyethylene terephthalate

Tomisawa

Ikaga

Kim

et al. 2017

Polymer

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“…The term "melt structure control" [4][5][6][7][8][9][10][11] refers to methods of producing a homogeneous chain network structure, and bicomponent melt spinning has been investigated as one process of melt structure control. 5,9,11 The bicomponent melt spinning process, in which two types of polymer are simultaneously extruded from a spinneret, produces a unique fiber structure that is substantially different from that of a melt spun homopolymer. 5 The chain orientation relies heavily on the extensional stress at the solidification point in melt spinning, and therefore in bicomponent spinning the molecular orientation can be controlled by selecting an appropriate secondary component.…”

Section: Introductionmentioning

confidence: 99%

Fiber structure development in PS/PET sea-island conjugated fiber during continuous laser drawing

Sugawara

Ikaga

Kim

et al. 2015

Polymer

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The effect of draw ratio, molecular weight, and sea-island conjugated spinning with a polystyrene component on the fiber structure development of PET during laser drawing was analyzed by in-situ measurements with a 0.1 ms time resolution using an ultra-high luminance X-ray beam generated from a synchrotron equipped with an undulator. The fiber temperature increased from 120 o C to 160-220 o C during the structure development process. By drawing the higher molecular weight PET to a higher draw ratio, a larger amount of fibrillar smectic mesophase formed just after the onset of necking, and a more highly oriented crystal formed after the extinction of the smectic mesophase. Accordingly, fibers with higher strength and higher thermal shrinkage stress were obtained. On the other hand, by conjugated spinning with a PS component, the fiber temperature increased along with an increase in the drawing stress, but the stress applied to the PET component should have decreased.The amount of smectic mesophase formed by the conjugated-spinning process was drastically decreased, and no crystallization induction time was observed, unlike the other cases. Crystallization, particularly the growth of a lamellar crystal, was also promoted. Moreover, a higher Young's modulus, a higher yield stress, and a higher shrinkage stress were observed for the conjugated-spun and drawn fibers. Therefore, the fibrillar smectic mesophase seems to block the formation of the lamellar crystal. Furthermore, the resultant fibrillar structure tends to result in a higher strength, but a relatively lower modulus and yield strength of the fiber.

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High-Strength PET Fibers Produced by Conjugated Melt Spinning and Laser Drawing

Cited by 2 publications

References 15 publications

Effect of melt spinning conditions on the fiber structure development of polyethylene terephthalate

Effect of melt spinning conditions on the fiber structure development of polyethylene terephthalate

Fiber structure development in PS/PET sea-island conjugated fiber during continuous laser drawing

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