Structure, Performance And Processing Modification Of Impact Copolymer Polypropylene

As a high performance polyolefin material, impact polypropylene copolymer (IPC) hasgood strength and impact toughness, and has been widely used in many fields. Due to havingextraordinary variety and complexity in composition and structure, the IPC melt actsparticularly rheological behavior. Considering that the final performances of IPC stronglydepend on its structure, composition and condensed state, and the rheological behavior canreflects the processing property of IPC, the study on structure and rheological behavior isnecessary to optimize IPC’s performances and develop the optimal processing theory.Here, the chain structure and morphology of four IPC samples was studied, and thedynamic rheological behavior of IPC was discussed. Furthermore, a dispensing ofIPC/POE/HDPE/talc flour used for bumpers was developed.The morphology of four IPC samples show two phases structure. The crystalline PP inIPC is typical α-crystal form which belongs to monoclinic system. The melt of IPC sampleshowed typical pseudoplastic flow. Dynamic rheological studies have shown that the secondplateau appears in the lg G′-lg ω plot in low ω range, which is related to the networkformation of the IPC samples, the phenomenon of second platform indicates the phaseseparation of IPC. The characterization of Han curves and the Cole-Cole curve results alsoshow that there are varying degrees of phase separation phenomenon in each sample.Theextraordinary viscoelastic response of IPC specimens in the low ω region related to theformation of the network structure and its relaxation of the dispersed droplets in IPC.The injection molding conditions cause the change of the aggregation structure of IPC,and significantly affect its mechanical properties.