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Article

Structure and Properties of Poly(ethylene terephthalate) Fiber Webs Prepared via Laser-Electrospinning and Subsequent Annealing Processes

1
Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
2
Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
3
School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259-J3-142, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
4
Department of Fiber Science and Apparel Design, Cornell University, 135 Human Ecology Building, Ithaca, NY 14850, USA
5
Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5783; https://doi.org/10.3390/ma13245783
Received: 18 November 2020 / Revised: 6 December 2020 / Accepted: 9 December 2020 / Published: 18 December 2020
(This article belongs to the Special Issue Novel Synthetic Fibers for Textile Applications)
Melt-electrospinning is an eco-friendly method for producing ultra-fine fibers without using any solvent. We prepared webs of poly(ethylene terephthalate) (PET) through melt-electrospinning using CO2 laser irradiation for heating. The PET webs comprised ultra-fine fibers of uniform diameter (average fiber diameter = 1.66 μm, coefficient of variation = 19%). The co-existence of fibers with high and low molecular orientation was confirmed through birefringence measurements. Although the level of high orientation corresponded to that of commercial highly oriented yarn, crystalline diffraction was not observed in the wide-angle X-ray diffraction (WAXD) analysis of the webs. The crystallinity of the webs was estimated using differential scanning calorimetry (DSC). The fibers with higher birefringence did not exhibit any cold crystallization peak. After annealing the web at 116 °C for 5 min, a further increase in the birefringence of the fibers with higher orientation was observed. The WAXD results revealed that the annealed webs showed crystalline diffraction peaks with the orientation of the c-axis along the fiber axis. In summary, the formation of fibers with a unique non-crystalline structure with extremely high orientation was confirmed. View Full-Text
Keywords: poly(ethylene terephthalate); melt-electrospinning; ultra-fine fibers; birefringence; crystallinity poly(ethylene terephthalate); melt-electrospinning; ultra-fine fibers; birefringence; crystallinity
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MDPI and ACS Style

Tokuda, T.; Tsuruda, R.; Hara, T.; Kobayashi, H.; Tanaka, K.; Takarada, W.; Kikutani, T.; Hinestroza, J.P.; Razal, J.M.; Takasaki, M. Structure and Properties of Poly(ethylene terephthalate) Fiber Webs Prepared via Laser-Electrospinning and Subsequent Annealing Processes. Materials 2020, 13, 5783. https://doi.org/10.3390/ma13245783

AMA Style

Tokuda T, Tsuruda R, Hara T, Kobayashi H, Tanaka K, Takarada W, Kikutani T, Hinestroza JP, Razal JM, Takasaki M. Structure and Properties of Poly(ethylene terephthalate) Fiber Webs Prepared via Laser-Electrospinning and Subsequent Annealing Processes. Materials. 2020; 13(24):5783. https://doi.org/10.3390/ma13245783

Chicago/Turabian Style

Tokuda, Tomoki, Ryo Tsuruda, Takuya Hara, Haruki Kobayashi, Katsufumi Tanaka, Wataru Takarada, Takeshi Kikutani, Juan P. Hinestroza, Joselito M. Razal, and Midori Takasaki. 2020. "Structure and Properties of Poly(ethylene terephthalate) Fiber Webs Prepared via Laser-Electrospinning and Subsequent Annealing Processes" Materials 13, no. 24: 5783. https://doi.org/10.3390/ma13245783

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