High-Speed Melt Spinning of Polylactide/Poly(Butyleneterephthalate) Bicomponent Fibers: Mechanism of Fiber Structure Development and Dyeing Behavior |
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Authors: | Yutaka Kawahara Motohiro Hanada Shota Onosato Wataru Takarada Midori Takasaki Koji Takeda |
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Affiliation: | 1. Division of Environmental Engineering Science, Gunma University, Kiryu, Japan;2. kawahara@gunma-u.ac.jp;4. Graduate School of Engineering, Gunma University, Kiryu, Japan;5. Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo, Japan;6. Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Kyoto, Japan;7. Tama Techno Plaza, Tokyo Metropolitan Industrial Technology Research Institute, Tokyo, Japan |
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Abstract: | Bicomponent fibers consisting of polylactide (PLA) as the sheath and poly(butylene terephthalate) (PBT) as the core were produced by high-speed spinning to obtain materials suitable for medical clothing. The higher-order structure of the PLA fiber component appeared to exhibit simple, alternately stacked, uniaxially oriented amorphous and crystalline regions. Therefore, fairly large tanδ peaks were observed for single-component PLA fibers, even when the orientation-induced crystallization was achieved by high-speed spinning. By conjugating PLA with PBT, although limited mutual interference with the crystallization of each component occurred, both the PLA (Mw?=?170,000, L-lactide content?=?98.7%) and PBT (intrinsic viscosity?=?0.835-0.865 dL/g) could crystallize on a high-speed spinning line, and the proposed formation of a shish-kebab-like structure in the PBT component enhanced the thermal stability of the bicomponent fibers, particularly resulting in shrink-proof properties. The bicomponent fibers developed herein could be deeply dyed at 98?°C, with results comparable to those of industrial polyester, and peeling of the PLA skin layer was rarely observed, even when the dyed fibers were flattened by a rubbing force. |
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Keywords: | Polylactide poly(butylene terephthalate) bicomponent fiber high-speed melt spinning shish-kebab-like structure thermal stability |
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