Research On The Preparation And Properties Of Polyphenylene Sulfide Fiber Reinforced And Toughened By Multi-walled Carbon Nanotubes

The research is mainly about the preparation, structure and properties of blend polyphenylene sulfide fiber using in high temperature flue gas filtrationa. Polyphenylene sulfide fiber with excellent heat resistance, corrosion resistance, flame resistance as the production of high-temperature bag filter bag filter of the main raw materials. But there are still some disadvantages:on the one hand, pure PPS products, brittle, poor toughness, rigidity and strength is not enough good to satisfy power plants, cement plants, incinerators and other gas processing business to its strength for losses was significantly shorter bag life; the other hand higher prices, which limits the application of PPS. My group from the current situation of application on PPS fiber of coal-fired power plant boiler dust, in allusion to the problem of PPS fiber such as lower life, lower toughness and larger loss of strength so on. Our planning to take a targeted solution based on the work at home and abroad. At present, There are many ways about the modified of the PPS that mainly by chemical structure modification, add the inorganic filler to blend and preparation of polyphenylene sulfide alloy. Studies on CNTs/polymer composite fiber have made some progress, especially with its excellent mechanical properties of CNTs as a reinforcement phase in the fiber of success. To this end, the present study, carbon nanotubes to enhance the toughening PPS fiber, in order to meet the power plants, cement plants, incinerators and other gas processing business to its loss of strength requirements, to extend filter bag life.The topics chosen for multi-walled carbon nanotubes (MWCNTs) as a filling material and the pure PPS slices in twin-screw extruder for melt blending, preparation of PPS/MWCNTs toughening masterbatches; and then by blending melt spinning-led prepared by means of extension toughening PPS/MWCNTs fibers, and then the structure and properties of the PPS/MWCNTs masterbatches and the PPS fibers were characterized. Focus on: the masterbatches formulation and processing conditions on the PPS/MWCNTs toughening performance of masterbatches can be processed, the development of good compatibility and dispersion of high concentration masterbatches blends; by TEM, DSC on the masterbatches morphology and structure were characterized. Design blends with different concentrations formula and blend spinning condition experiments to observe the different conditions of the blend fibers can be spun, structure and performance. The optimum conditions. Using TEM, SEM, DSC, velocity meter, tensile device, and other equipment for toughening PPS/MWCNTs fiber morphology, structure and properties were characterized and tested.TEM and SEM studies show that the MWCNTs in the PPS fibers and masterbatches have good dispersion and there is no obvious aggregates, in addition, MWCNTs along the fiber axis alignment under the effect of shear stress of the screw hole spinneret. DSC study shows that, The results indicated that MWNTs played the role of heterogeneous nucleating agents in the crystallizing process of PPS, and raised the composite's start crystallization temperature and crystallinity. When the content of MWNTs was 3wt%, the crystallinity was best, about 52.10%; The results on the mechanical properties of fibers show that:MWCNTs can improve the breaking strength and elongation at break of fibers, when the content of MWCNTs is 0.6%, PPS/MWCNTs maximum breaking strength of fiber 2.84CN/dtex, more pure PPS fiber fracture strength increased by nearly 35%; elongation rate of 26.3%, compared with pure PPS fiber elongation increased by 22.8%. Shrinkage of fiber indicated that:the drying shrinkage and boiling water shrinkage rate of PPS/MWCNTs fibers decreased with the content of MWCNTs and when the content of MWCNTs was 0.6%and 0.8%, the drying shrinkage and boiling water shrinkage rate of PPS/MWCNTs fibers minimum value, respectively 7.1%and 2.4%.