Research Of High Performance Of PP/PA6/nano-CaCO₃ Blends

The orthogonal experiment with three factors at three levels was designed to test the effect of PA, nano-CaCO3 and PP-g-MAH amount on the performance of PP/PA/nano-CaCO3 blend. The optimum proportion is: PP/PA6/ nano-CaCO3/ PP-g-MAH=100/15/15/25.The influence of the content of PA,nano-CaCO3 and PP-g-MAH on the capability of the PP is studied. The result show that the impact strength increases first and then decreases with the increasing of the content of PA and nano-CaCO3. The optimum content of PA and nano-CaCO3 is 14 percent and 12 percent. The impact strength increases with the increasing of PP-g-MAH while the flexural strength and the tensile decrease sharply. The best content of PP-g-MAH is 25 percent.It's reported that POE can increase the impact strength significantly, so POE-g-MAH is used to replace PP-g-MAH. The result show that the impact strength increases greatly without nano-CaCO3,and the tiptop is 890% of pure PP. But the flexural strength and the tensile strength decrease sharply. The impact strength can reach 780% of pure PP with nano-CaCO3,which is a little lower than that without nano-CaCO3,but the flexural strength and the tensile strength are a little lower than that of pure PP. The best prescription is: PP/PA/nano-CaCO3/POE-g-MAH= 100/14/11/25.In addition to the macroscopic mechanics test, FT-IR, 1H-NMR, PLM, DSC, SEM and WAXD characterization were carried out to study the crystallization behavior. It was found that the overall performance of PP is enhanced, in that the impact intensity gets increased while the flexural and tensile intensity basically kept constant, which extends the further application realm of polypropylene (PP) as general of plastics.