Structure and properties development in poly(phenylene sulfide) fibers. II. Effect of one‐zone draw annealing

Abstract

In this article, we discuss the role of one‐zone drawing followed by annealing in enhancing the structure and properties of fibers manufactured from Fortron® linear poly(phenylene sulfide) resins. The interaction effects of the polymer molecular weight (MW), melt‐spinning process parameters, and draw‐annealing process conditions were also elucidated. Several tools used to probe the investigation were tensile testing, differential scanning calorimetry, polarized light optical microscopy, wide‐angle X‐ray scattering, and small‐angle X‐ray scattering. This study showed that the optimum drawing temperature was around 95°C. A considerable improvement in the fiber tensile properties was observed upon drawing and annealing under optimum processing conditions. Fibers with tenacities close to 5 g/den were obtained. The development of the tensile properties was statistically correlated with the morphological changes in the fibers. The routes to achieving fibers with optimum tensile properties were shown to be different for resins with different MWs. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Structure and properties enhancement in poly(phenylene sulfide) melt spun fibers. III. Effect of two zone drawing and annealing

“…To investigate the influence of additional annealing at elevated temperatures, yarns drawn in a single zone at a draw temperature of 95°C and annealed using the 10‐cm long heater at 150°C as discussed in detail in our earlier publication,2 were further passed through 1‐m long heater that was placed after the third draw roll pair. The long heater was maintained at 190°C.…”

“…Amorphous orientation factor was calculated from crystallinity, birefringence, and crystalline orientation. Details of these characterization techniques were reported in our earlier publications 1, 2…”

“…Details of polymers and experimental methods used to manufacture as-spun fibers were provided in our earlier publications. 1,2 Three variations of proprietary Fortron V R linear PPS resins in the pellets form were supplied by Ticona Polymers, a business of Celanese Chemicals. The sample codes are 1P, 2P, and 3P.…”

“…Details of these characterization techniques were reported in our earlier publications. 1,2 To determine crystal thickness along the fiber axis, selected fiber samples were analyzed using WAXS for (00l) reflections. The Phillips diffractometer in transmission geometry was used for this study.…”

“…Detailed investigation of the influence of melt spinning variables and of one zone draw-annealing on structure-properties enhancement in PPS melt spun fibers was reported in our earlier publications. 1,2 It has been reported by several investigators that increasing the number of draw zones and thereby achieving the possible drawability in stages helps in improving the fiber tensile properties further. 3,4 Suzuki et al 5 reported improvements in fiber properties by multizone drawing and annealing of industrially produced as-spun PPS fibers.…”