Fiber structure development of poly(ethylene terephthalate-co-isophthalate) copolymer

Tomisawa, Ren; Okazaki, M.; Ikaga, Toshifumi; Kim, KyoungHou; Ohkoshi, Yutaka; Okada, Kazuyuki; Kabe, Taizo; Kanaya, Toshiji; Katsuta, Hiroo; Funatsu, Yoshitsugu

doi:10.1016/j.polymer.2022.124708

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…This indicates that the tensile strength of highly oriented fibers is not just decided by their average molecular orientation and crystallinity, it also depends on the amount and orientation of the molecular chains bearing tensile force. Previously, the amount of these molecular chains has been estimated from the diffraction intensity of the smectic phase 8,16 . The higher diffraction intensity is also observed for the H-polymer in this study (Fig.…”

Section: Relationships Between the Smectic D-spacing And Tensile Prop...mentioning

confidence: 99%

“…The time elapsed after necking can be calculated from the distance divided by the fiber running speed 8 . Moreover, recent improvements in both S/N ratio and diffraction angle resolution have been made possible using an ultra-bright beamline equipped with an undulator and a high-resolution SOPHIAS detector [13][14][15][16] , allowing structural changes in the smectic phase to be observed more precisely. Accordingly, good correlation between the amount of smectic phase and the tensile strength of drawn fibers has been observed [14][15][16] .…”

mentioning

confidence: 99%

“…Moreover, recent improvements in both S/N ratio and diffraction angle resolution have been made possible using an ultra-bright beamline equipped with an undulator and a high-resolution SOPHIAS detector [13][14][15][16] , allowing structural changes in the smectic phase to be observed more precisely. Accordingly, good correlation between the amount of smectic phase and the tensile strength of drawn fibers has been observed [14][15][16] . Furthermore, the apparent modulus was obtained from the change in smectic d-spacing with drawing stress 9 .…”

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confidence: 99%

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Tensile strength of polyester fiber estimated by molecular-chain extension prior to structure formation

Tomisawa

Nagata

Otsuka

et al. 2023

Sci Rep

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The combination of laser irradiation heating and synchrotron X-ray sources has made it possible to observe the fiber-structure development that occurs at sub-millisecond timescales after necking during continuous drawing. Through wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) analysis of poly(ethylene terephthalate) fibers of three different molecular weights drawn under equivalent stresses, a good correlation was observed between the d-spacing of smectic (001ʹ) diffraction extrapolated to the necking point and the strength of the drawn fiber. This indicates that the molecular chains that bear the drawing stress also bear most of the applied stress during tensile testing of the resultant fiber. In addition, considering the drawing-stress dependence of the d-spacing and the molecular weight distribution of the fiber revealed that molecular chains with molecular weights over 23,000 g/mol bear the majority of tensile force applied to the fiber.

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Section: Relationships Between the Smectic D-spacing And Tensile Prop...mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Tensile strength of polyester fiber estimated by molecular-chain extension prior to structure formation

Tomisawa

Nagata

Otsuka

et al. 2023

Sci Rep

Self Cite

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“…It has been reported that transparency, ultraviolet (UV) shielding, heat resistance, and gas barrier properties of PET products can be achieved by incorporating comonomers with specific chemical structures by copolymerization reactions. The alternate comonomers are the diols (such as 1,4-cyclohexanedimethanol, isosorbide, 2,2,4,4-tetramethyl-1,3-cyclobutadiol) , and diacids (such as isophthalic acid, 2,2′-bifuran-5,5′-dicarboxylic acid, α-truxillic acid). − …”

Section: Introductionmentioning

confidence: 99%

Kinetics of Ternary Copolycondensation for High-Performance PCTG Copolyester with Ester Interchange, Polycondensation, and Mass Transfer

Wang,

Zheng,

Jiang

et al. 2024

Ind. Eng. Chem. Res.

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Poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PCTG) is a high-performance engineering copolyester prepared using terephthalic acid (TPA), ethylene glycol (EG), and 1,4-cyclohexanedimethanol (CHDM). In this work, a complex reaction network of PCTG copolyesters involving homopolymerization and cross-polymerization was presented and the corresponding reaction mechanism was proposed. The reaction kinetics and mass transfer behavior were investigated using static thin film experiments, wherein the variation of the hydroxyl endgroup concentrations of EG and CHDM with reaction time was separately determined. The results showed that the apparent reaction rate benefited from the high temperature, thin film thickness, and high vacuum conditions. Based on the pseudosteady-state assumption, the apparent reaction rate model coupled with mass transfer was evaluated and the model parameters including the reaction rate coefficient, equilibrium constant, and mass transfer coefficient were obtained, which were further used to simulate the polycondensation process. The concentration variation of EG and CHDM, and the rate variation of each reaction during polycondensation are discussed by combining the effects of homopolymerization, cross-polycondensation, and mass transfer. The concentration of EG was more sensitive to pressure than that of CHDM, which promoted the production of CHDM at high pressures. The proposed model is expected to provide guidance for the optimization of industrial production of PCTG/PETG and generalize to other copolyester systems.

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Application of a Rare Earth Catalyst in Polyethylene Glycol Terephthalate and Low-Melting Polyethylene Glycol Terephthalate

Libin Chen,

Tai,

Wang

et al. 2023

Polym. Sci. Ser. B

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Fiber structure development of poly(ethylene terephthalate-co-isophthalate) copolymer

Cited by 6 publications

References 19 publications

Tensile strength of polyester fiber estimated by molecular-chain extension prior to structure formation

Tensile strength of polyester fiber estimated by molecular-chain extension prior to structure formation

Kinetics of Ternary Copolycondensation for High-Performance PCTG Copolyester with Ester Interchange, Polycondensation, and Mass Transfer

Application of a Rare Earth Catalyst in Polyethylene Glycol Terephthalate and Low-Melting Polyethylene Glycol Terephthalate

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