Structure development and dynamic properties in high-speed spinning of high molecular weight PEN/PET copolyester fibers |
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Authors: | Sung Joong Kim Seung Soon Im |
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Institution: | (1) Department of Polymer and Fiber Engineering, College of Engineering, Hanyang University, 133-791 Seoul, Korea;(2) Kolon Industrial Materials Technology Team, Kumi Plant, Kolon Industrial Inc., Korea |
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Abstract: | The structure development and dynamic properties of fibers produced by high-speed spinning of P(EN-ET) random copolymers were
investigated. The as-spun fibers were found to remain amorphous up to the spinning speed of 1500 m/min, and subsequent increases
in speed resulted in the crystalline domains containing primarilyα crystalline modification of PEN. Theβ modification was not found up to spinning speeds of 4500 m/min. On the other hand, annealing of constrained fibers spun at
the 2100 m/min at 180, 200, and 240°C exhibitedβ-form crystalline structure, while the annealed fibers spun in 600–1500 m/min range exhibited dominantlyα-form. Howeverβ-form crystals disappeared above the spinning speed of 3000 m/min. With increasing spinning speeds from 600 to 4500 m/min,
the storage modulus of as-spun fibers increased continuously and reached a value of about 10.4 Gpa at room temperature. The
tanδ curves showed theα-relaxation peak at about 155–165°C, which is considered to correspond to the glass transition. Theα-relaxation peaks became smaller and broader, and shift to higher temperatures as the spinning speed increases, meaning that
molecular mobility in the amorphous region is restricted by increased crystalline domain. |
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Keywords: | PEN/PET copolymer High-speed spinning Annealing Crystal structure Dynamic property |
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