High Speed Melt Spinning of Poly (Ethyleneterephthalate)

Shimizu, Jiro; Okui, Norimasa; Kikutani, Takeshi

doi:10.2115/fiber.37.4_t135

Cited by 54 publications

(33 citation statements)

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“…With the relationship S~3 = e~3 /o-, eq 12 is given by S~3 = cos 2 ¢ 3 S 33 + (l/2)(1-cos 2 ¢ 3 )(S 13 + S 23 ) = { cos 2 <p3 + (I /2)(1-cos 2 <p3) (13) According to an estimate by Hibi et al, 33 the compliances S 13 and S 23 can be represented as S13= -V31S33 (14) Thus, eq 13 can be rewitten as {cos 2 ¢ 3 -(l/2)(1-cos 2 </J 3 )(v31 +v 32 )}S 33 (15) The crystal lattice modulus E~ in the c-axis ( or fiber axis) is represented by using the apparent where the values of all the coefficients in eq 17 were given by Daubeny et al 24 Substituting the values into eq 17, we find ¢ 3 =9.77. This indicates that the c-axis are oriented predominantly in the X 3 axis and the mathematical evaluation by eq 9-16 is valid.…”

Section: Res Ul Ts and Discussionmentioning

confidence: 99%

Morphological and Mechanical Properties of Poly(ethylene terephthalate) Gel and Melt Films in Terms of the Crystal Lattice Modulus, Molecular Orientation, and Small Angle X-Ray Scattering Intensity Distribution

Matsuo

Sawatari

1990

Polym J

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ABSTRACT:Deformation mechanism of polyethylene terephthalate (PET) gel and melt films was investigated in terms of morphological aspects by scanning electron microscopy, small angle X-ray scattering, and wide angle X-ray difiraction. The morphological properties were discussed in relation to the temperature dependence of the dynamic complex modulus. The storage modulus of the melt film with a draw ratio of 20 was 19.5 GPa at 20°C, while that of the gel film with a draw ratio of 7 was 16.2 GPa. The apparent crystal lattice modulus of the (105) plane was measured by X-ray diffraction. Using the apparent value, the real value of the crystal lattice modulus was estimated to be 118 GPa through a somewhat complicated geometrical treatment. The storage moduli for both the specimens are much lower than the crystal lattice modulus. In order to study the large difference, the crystallite orientation was estimated in terms of the second order orientation factor of the c-axis and the theoretical analysis of small angle X-ray scattering patterns. It turns out that under oriented crystallization, the preferential orientation of the c-axis is attributed to the rotation of crystallites with respect to the stretching direction but not to a crystal transformation from a folded to a fibrous type. Such a orientation mode is thought to hamper ultradrawing to produce high modulus PET films.

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Section: Res Ul Ts and Discussionmentioning

confidence: 99%

Morphological and Mechanical Properties of Poly(ethylene terephthalate) Gel and Melt Films in Terms of the Crystal Lattice Modulus, Molecular Orientation, and Small Angle X-Ray Scattering Intensity Distribution

Matsuo

Sawatari

1990

Polym J

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“…The x-shaped pattern was obvious at the lower draw ratio, and was particularly distinct for S-PET, whereas the x-shaped pattern was observed for a longer elapsed time, 0.58 ms, with the higher draw ratio and for H-PET. The x-shaped pattern was also observed for the high-speed spun fiber 32,33 and the edge image of a PET film drawn at 100 o C. 34 Funai et al 35 proposed the zig-zag fibril to explain this pattern, but the structuralorigin of the pattern remains unclear. Figure 12 shows an intensity profile parallel to the equator passing through the 4-point peak.…”

Section: Saxs Patternmentioning

confidence: 85%

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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“…In the measurement, fibers. 11 From the result of the 0.5 km/min fiber Ç 5 mg of the fiber sample which was cut to small which was essentially isotropic, the mean refracpieces was measured at a heating rate of 20ЊC/ tive index of PEN turned out to be Ç 1.65. This min and in the temperature range of up to 320ЊC.…”

Section: Resultsmentioning

confidence: 99%

Fiber structure formation in ultra-high-speed melt spinning of poly(ethylene 2,6-naphthalene dicarboxylate)

Miyata

Kikutani

Okui

1997

J. Appl. Polym. Sci.

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ABSTRACT:The high-speed melt spinning of poly(ethylene 2,6-naphthalene dicarboxylate ) ( PEN ) was performed up to the take-up velocity of the ultra-high-speed region, 9 km/min. From the investigations of the structure and physical properties of the asspun fibers, the high-speed spinning of PEN was divided into three regions in terms of the mechanism of fiber structure formation. The first region is the take-up velocity of up to 2.5 km/min and the birefringence of up to 0.08 where only a slight increase in molecular orientation was attained. At the take-up velocity of 2.5-4.5 km/min and the birefringence of 0.08 -0.25, although some experimental evidences indicated that the orientation-induced crystallization did not occur, there was an increase in the fiber density which suggested the formation of some ordered structure. At the take-up velocity ú 4.5 km/min and birefringence ú 0.25, the orientation-induced crystallization occurred. The fibers obtained in this region were characterized by the formation of the crystalline structure dominated by the b form. The presence of the necklike deformation in the spinning line was also confirmed. The solidification temperature of the spinning line analyzed from the diameter profile suggested that the formation of b modification crystals occurred at relatively low crystallization temperatures in comparison with that in an isotropic state. Therefore it was indicated that the presence of elongational stress in the spinning line promoted the formation of the b modification crystals.

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High Speed Melt Spinning of Poly (Ethyleneterephthalate)

Cited by 54 publications

References 0 publications

Morphological and Mechanical Properties of Poly(ethylene terephthalate) Gel and Melt Films in Terms of the Crystal Lattice Modulus, Molecular Orientation, and Small Angle X-Ray Scattering Intensity Distribution

Morphological and Mechanical Properties of Poly(ethylene terephthalate) Gel and Melt Films in Terms of the Crystal Lattice Modulus, Molecular Orientation, and Small Angle X-Ray Scattering Intensity Distribution

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

Fiber structure formation in ultra-high-speed melt spinning of poly(ethylene 2,6-naphthalene dicarboxylate)

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