Preparation of high-modulus poly(ethylene terephthalate) fibers by vibrating hot drawing

✍ Scribed by Toshio Kunugi; Akihiro Suzuki

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 626 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961024)62:4<713::aid-app15>3.0.co;2-w

✦ Synopsis

A novel drawing method, vibrating hot drawing, was successfully applied to poly(ethy1ene terephthalate) fiber, which has a normal molecular weight (IV = 0.7 dL/g) and was prepared by melt spinning. The process was divided into three steps, with differing conditions in drawing temperature, applied tension, vibrating frequency, and amplitude. The drawing temperature and vibration frequency were decided by considering the a, dispersion of the polymer. In spite of a low draw ratio (7.7) and a low crystallinity (0.55), the birefringence and dynamic storage modulus at room temperature of the 3rd-step fiber reached 0.260 and 36 GPa, respectively. The modulus remains at a high level a t elevated temperatures, for example, 29 GPa at 100°C and 17 GPa a t 200°C. Further, it was found from temperature and intensity of the a, dispersion peak that the movements of amorphous chains are strongly inhibited. 0 1996 John Wiley & Sons, Inc.