Fiber Structure Development and Mechanical Properties in Continuous Drawing and Annealing of Poly (phenylene sulfide) Filament

Abstract

Poly(phenylene sulfide) (PPS) multi-filaments were continuously drawn and annealed. The maximum values of birefringence, crystallinity, tensile strength and Young′s modulus in the drawn and annealed PPS filament were 249×10−3 ‚ 27%, 5.3 cN/dtex and 64 cN/dtex‚ respectively. The orientation-induced crystallization was observed at 150×10-3 of birefringence. The crystal orientation factor f′ was estimated by wide angle X-ray diffraction. The λnet was estimated by the strain shifting of true stress - true strain curve to the master curve. The orientation estimated by the λnet differed from that estimated by birefringence. The fiber structure development and the mechanical properties of resultant fibers were discussed in terms of orientation parameters, which were birefringence‚ network draw ratio (λnet) and crystal orientation factor (f′). The birefringence shows a good correlation with the Young’s modulus. On the other hand, λnet shows a good correlation with the tensile strength. The f′ shows good correlations with both Young′s modulus and tensile strength‚ however‚ they tend to saturate at high f′. The melting temperature of PPS changed from 280.1oC to 288.7oC with the increase of birefringence and λnet.