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Open AccessArticle

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

Department of Chemical Engineering, Hanyang University, Seoul 04763, Korea
Technical Textile R&D Group, Korea Institute of Industrial Technology, Ansan 15588, Korea
Business Department, Samwon Ind. Co. Ltd., Ansan 15612, Korea
R&D Center, Huvis Corporation, Daejeon 34326, Korea
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;
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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