Application of zone-drawing and zone-annealing method to poly(p-phenylene sulfide) fibers

✍ Scribed by Akihiro Suzuki; Takafumi Kohno; Toshio Kunugi

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 178 KB
• Volume: 36
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19980730)36:10<1731::aid-polb14>3.0.co;2-a

✦ Synopsis

A zone-drawing and zone-annealing treatment was applied to poly( p-phenylene sulfide) fibers in order to improve their mechanical properties. The zone-drawing (ZD) was carried out at a drawing temperature of 90ЊC under an applied tension of 5.5 MPa, and the zone-annealing (ZA) was carried out at an annealing temperature of 220ЊC under 138.0 MPa. The differential scanning calorimetry (DSC) thermogram of the ZD fiber had a broad exothermic transition (T c Å 110ЊC) attributed to coldcrystallization and a melting endotherm peaking at 286ЊC. The T c of the ZD fiber was lower than that ( T c Å 128ЊC) of the undrawn fiber. In the temperature dependence of storage modulus ( E) for the ZD fiber, the E values decreased with increasing temperature, but increased slightly in the temperature range of 90-100ЊC, and decreased again. The slight increase in E was attributable to the additional increase in the crosslink density of the network, which was caused by strain-induced crystallization during measurement. The resulting ZA fiber had a draw ratio of 6.0, a degree of crystallinity of 38%, a tensile modulus of 8 GPa, and a tensile strength of 0.7 GPa.