High-performance poly(ethylene-2,6-naphthalate) fiber prepared by high-tension annealing

✍ Scribed by Akihiro Suzuki; Chieko Koide

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 171 KB
• Volume: 38
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(20000101)38:1<61::aid-polb7>3.0.co;2-c

✦ Synopsis

A high-tension annealing (HTA) method has been applied to zone-annealed poly(ethylene-2,6-naphthalate) (PEN) fibers in order to further improve their mechanical properties. The HTA treatment was carried out under an applied tension of 428 MPa at a treating temperature of 175 °C. The applied tension was close to the tensile strength at 175 °C. The resulting HTA fiber had a birefringence of 0.492 and degree of crystallinity of 57%. Wide-angle X-ray diffraction (WAXD) photographs of the HTA fibers showed three reflections (010, 100, and 1 10) attributed to an ␣ form crystal, but no (020) reflection attributed to a ␤ form was observed in the equator. The tensile modulus and tensile strength increased with processing, and the HTA fiber had a maximum modulus of 33 GPa, a tensile strength of 1.1 GPa, and a storage modulus of 33 GPa at 25 °C.