The Study On The Rheology, Crystallization And Mechanical Properties Of PPS/PMVS Blends

Poly(phenylene sulfide) (PPS), with high rigid chain structure which linked by benzene ring and the sulfur atom alternately, has outstanding heat resistance, excellent flame retardant, chemical corrosion resistance. It has an extensive and important application prospect in the field of national defense and civil. However PPS produced by direct synthesis with lower molecular weight, it’s usually adopt thermal cross-linking treatment and toughening modification to improve the mechanical properties of PPS. Now the two processes are carried out step by step, not only the effect of toughening has a larger limit, it’s also led to the problem of high energy consumption.Due to the thermal chemical characteristic of PPS that it can automatically generate macromolecular free radicals at high temperature, and the mechanical and reaction characteristics of poly(methyl-vinyl siloxane)(PMVS) are coupled with PPS. Therefore, a series of PPS/PMVS blends are made by melting process. The macromolecular free radicals of PPS produced in the melt-mix process of PPS/PMVS interact with the toughening elastomer and form into cross-linking structure in the blends which has extraordinary toughness. The thermal cross-linking and toughening modification of PPS is completed in the same process. In our previous work, the compatibility, the thermal cross-linking behaviors, different heat-treatment temperatures and mold temperature, and other processing conditions on the properties of PPS/PMVS blends have been discussed. However, the effect of the cross-linking structures in the blends on rheological processing, crystallization and mechanical properties will decide to the control direction of the structures. So based on the previous research, this paper studies the rheological properties of PPS/PMVS in the different atmospheres of air and nitrogen; and studies the crystallization behavior, mechanical properties and heat resistance of PPS/PMVS blends.