Higher-order structures and mechanical properties of stereocomplex-type poly(lactic acid) melt spun fibers |
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Authors: | Yukiko Furuhashi Yoshiharu Kimura Hideki Yamane |
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Affiliation: | a Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8505, Japan b Department of Polymer Science and Engineering, Kyoto Institute of Technology, Matsugasaki Sakyo-Ku, Kyoto 606-8585, Japan c Division of Advanced Fibro-Science, Kyoto Institute of Technology, Matsugasaki Sakyo-Ku, Kyoto 606-8585, Japan |
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Abstract: | Equimolar blend of poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) was melt spun into fibers and the relations among the processing conditions, crystalline structures, thermal properties, and mechanical properties were investigated. Drawing and annealing were performed in order to obtain fiber mainly consisting of the stereocomplex crystal phase. Fibers drawn at various temperatures exhibited either amorphous, highly oriented homo crystal, or the mixture of homo and stereocomplex with a fairly low orientation depending on the drawing temperature. Annealing of the drawn fibers at an elevated temperature higher than the melting temperature of homo crystal increased the stereocomplex content significantly. The fractions of the homo and the stereocomplex crystals strongly depended on the higher-order structure of the drawn fibers and the annealing temperature. |
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Keywords: | Poly(lactic acid) Stereocomplex Fiber |
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