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Open AccessArticle

Effect of Polycondensation Catalyst on Fiber Structure Development in High-Speed Melt Spinning of Poly (Ethylene Terephthalate)

1
Department of Chemical Engineering, Hanyang University, Seoul 04763, Korea
2
Technical Textile R&D Group, Korea Institute of Industrial Technology, Ansan 15588, Korea
3
Business Department, Samwon Ind. Co. Ltd., Ansan 15612, Korea
4
R&D Center, Huvis Corporation, Daejeon 34326, Korea
5
Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Eun Seon Kim and Hyun Ju Oh are co-first authors and contributed equally.
Polymers 2019, 11(12), 1931; https://doi.org/10.3390/polym11121931
Received: 28 October 2019 / Revised: 19 November 2019 / Accepted: 20 November 2019 / Published: 22 November 2019
(This article belongs to the Special Issue Innovative Functional Textiles)
We conducted a preliminary study on fiber structural development in the high-speed melt spinning of environmentally friendly polyethylene terephthalate (Ti-PET) synthesized with 25 ppm of titanium-based catalyst, which was compared with conventional PET (Sb-PET) synthesized with 260 ppm of antimony-based catalyst. Gel permeation chromatography of Ti- and Sb-PET resins of intrinsic viscosity 0.63 confirmed that both resins have similar molecular weights and distributions. However, differential scanning calorimetry revealed that the Ti-PET resin exhibited a lower melt–crystallization peak and isothermal melt-crystallization rate than the Sb-PET resin. High-speed melt spinning of the Ti- and Sb-PET was possible up to a spinning velocity of 6 km/min. Two-dimensional wide-angle X-ray diffraction analyses showed that the molecular orientation of the obtained as-spun Ti- and Sb-PET fibers increased with spinning velocity, and a highly oriented, crystalline structure by orientation-induced crystallization started to appear from 5 km/min. Notably, Ti-PET fibers showed a lower degree of crystalline structural development and lower tensile strength compared with Sb-PET fibers under the high-speed spinning conditions. Our results suggest that the catalyst in PET resins can act as nucleating agents in thermal- and orientation-induced crystallization, and that differences in catalyst content can influence PET fiber structure development under extreme conditions in high-speed melt spinning. View Full-Text
Keywords: poly (ethylene terephthalate); catalyst; titanium; crystallization; melt spinning poly (ethylene terephthalate); catalyst; titanium; crystallization; melt spinning
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MDPI and ACS Style

Kim, E.S.; Oh, H.J.; Kim, H.-J.; Kim, C.G.; Park, S.Y.; Jeong, Y.G.; Hahm, W.-G. Effect of Polycondensation Catalyst on Fiber Structure Development in High-Speed Melt Spinning of Poly (Ethylene Terephthalate). Polymers 2019, 11, 1931.

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