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Two series of inorganic melamine salts containing a tungstate or molybdate were synthesized as a flame retardant and smoke suppressant for flexible PVC, and their flame retardancy and smoke suppression were studied by limiting oxygen index (LOI), smoke density rating (SDR) test, cone calorimeter, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). It can be found that the presence...
Two kinds of different size calcium carbonates are blended and filled into polypropylene in 30 wt%. The melting viscosity of PP composites samples is measured by capillary extrusion rheometer at 230°C. The results show that the melt viscosity of PP composites evidently decreased when that was filled with the blending 325 and 1,500 mesh CaCO3 and the 1,500 mesh proportion in fillers was from 20 to...
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