Study On PolyPhenylene Sulfide Fiber Formation

PPS （PolyPhenylene Sulfide） was high performance material with excellent heat resistance and erosion resistance. For domestically linear-PPS, some subjects about fundamental fiber formations were investigated, such as the spinnability, the molecular weight, the rheological properties, crystal properties and thermal behavior.The rheology of PPS was studied by the capillary rheometer. The apparent shear viscosity was measured with different shearing rate and temperature. The influence of temperature was more obvious at low temperature than high temperature. With the increasing of shearing rate, the viscous activation energy of PPS was decreased. The structural viscosity was reduced while the temperature increased. The relationship between rheologic behavior and spinnablity was also elucidated.Crystal properties of PPS were researched at the non-isothermal condition by the Differential Scanning Calorimetry （DSC）. The Avrami parameter n was about 4～6 based on the Avrami equation. Based on the Ozawa equation, the Ozawa parameter m was about 0.5～3. With the increasing of temperature, both the Ozawa parameter m and the crystal growth increased. The crystal activation energy of PPS was about 17.8 kJ/mol. At 250℃isothermal condition, the crystal induction period was about 18s and the growth of spherulite crystal was about 2.767×10^-7m/s.The crystal properties of polymer blends were also investigated, after adding nano-particles and ultra branch PPS. The crystallization temperature of PPS/CaCO₃, PPS/ultra branch PPS moved to the low temperature and their crystal growth becomed lower compared with the pure PPS. But these properties of PPS/ZnO、PPS/TiO₂、PPS/SiO2 changed in opposition with PPS/CaCO₃, PPS/ultra branch PPS.The properties of PPS fiber was studied during the process of melt spinning of PPS. With the take-up velocity of 400-800rnm/s, the domestically linear-PPS had the good spinnability. With the increasing of take-up velocity, the crystal orientation, the tensile strength and the break-up elongation changed little. After storing up for some time, some properties of PPS take-up fiber would vary. Based on the experimental data, the PPS fiber formation mechanism was simulated, such as crystal properties, mechanical performance and shrinkage.In the experiments, the PPS fiber was manufactured and the fiber formation was also discussed. The tensile strength was about 3.7cN/dtex; the break-up elongation was about 22.2％; the boiling water shrinkage was about 9.6％.