Study On Mechanical Propertise, Phase Structure And Rheological Propertise Of Polymer/Polyolefin Elastomer Blend Systems

The mechanical property,morphology structure,rheology property and DSC of PP,PA6,PC,POE,MAH-g-POE resins and their blends were studied systematically by means of a series of modern analysis technologies such as Twin-screw extruder,Injection molding machine,Universal tensile machine. Impact testing machine,SEM,DSC and ARES rheometer. It was found that the brittle-ductile transition of Ho-PP/POE and Co-PP/POE blends occurred at the POE content of twenty to thirty percent and five to ten percent respectively in PP/POE blends, then, their morphology structure become double Continuous Structure from sea-Island structure. These two kinds of blend systems showed different morphology. The interface of the formal was shown smoother edge than the latter one, which implied that the interface strength of the latter was stronger than the formal one. The formal's dispersed phase were round, at the same time, the latter's dispersed phase were strip. The results of dynamic rheological tests indicated that the structure of PP and content of POE have obvious effect on the shear rheological properties of PP/POE blends. As the non-newtonian shear rate increasing, the melt viscosity of the PP and their blends were decreased, and behave Shear thinning, show the Pseudo-plastic fluid features. With the increase of POE content, at the whole frequency region, the storage modulus and the shear viscosity of the blends inceased and higher than PP resin. The storage modulus and the shear viscosity of Ho-PP /POE blends inceased lower than that of Co-PP/POE blends. The above two blend systems showed greater increase in their storage Modulus and the shear viscosity at POE content of twenty to thirty percent and ten to twenty percent respectively when brittle-ductile transition was happened Interfacial slip existed between PP and POE, which was greatly influenced by the compatibility of PP and POE, and the interfacial slip between Ho-PP and POE was more obvious than that between Co-PP and POE.At the study of PA6,POE and MAH-g-POE resins and their blends, it was found that pure POE toughen the PA is very limited, at the extent of 25% of the POE, the notched impact strength of the blends increased less than doubled than pure PA, while the pure POE-g-MAH in the 25% blend the notched impact strength increased by nearly 8 times. The impact fracture energy of the PA+(MAH-g-POE/POE) blends is the best, better than PA/MAH-g-POE/POE blends. The tensile strength of seven kinds of blending increases as the elastomer gradually decreased. In the rheological properties, the blending system of the storage modulus and viscosity were higher than PA resins, with the increased of elastomers, the storage modulus and viscosity of the blends of have shown a raise trend. As the non-newtonian shear rate increasing, the melt viscosity of the PA6 and their blends were decreased, and behave Shear thinning, show the Pseudo-plastic fluid features.In the study of different proportion elastomers blends, it was found that when POE: MAH-g-POE=7:3, the mechanical property better than other proportion, at the same time, it was showed at the rheology properties. In the study of PC/POE/MAH-g-POE blends, it was further Confirmed that the brittle-ductile transition at mechanical property was found at the rheology properties. The above experimental results provided important experimental data for the further study of mechanical properties, phase structure and rheological properties of polymer/polyolefin elastomer blend systems blends.