Fibers and Polymers

, Volume 3, Issue 1, pp 18–23 | Cite as

Structure development and dynamic properties in high-speed spinning of high molecular weight PEN/PET copolyester fibers

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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.

Keywords

PEN/PET copolymer High-speed spinning Annealing Crystal structure Dynamic property 
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Copyright information

© The Korean Fiber Society 2002

Authors and Affiliations

  1. 1.Department of Polymer and Fiber Engineering, College of EngineeringHanyang UniversitySeoulKorea
  2. 2.Kolon Industrial Materials Technology TeamKumi Plant, Kolon Industrial Inc.Korea

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