.uhmwpe / Pp Blends Modified Research

UHMWPE/PP alloy is molded by mechanical blending process. Mixing-extruding-injecting molding process is chosen to do all experiments by analyzing two different processes, mixing-extruding-injecting molding process and extruding-injecting molding process, influencing on experimental results. Disentanglement agent compounded by ourselves is used, the content of UHMWPE > PP and disentanglement agent influencing on mechanical properties, rheological properties and thermal properties are researched. With Differential Scanning Calorimertric analysis (DSC) , Scanning electron microscopy (SEM) and polarizing microscope et al testing methods, properties of alloys are studied, such as crystallizing properties, impact section appearance of alloy, phase structure and distribution of microstructure.With the content of UHMWPE increasing, the Izod impact strength and tensile strength are improved greatly, but at the cost of rheological properties and thermal properties. The adding of disentanglement agent has effects on disentangling of UHMWPE. DSC testing shows: the system has two independent absorption of heat apexes are the contribution of UHMWPE and PP phase, which declare it is two-phase structure. With the content of UHMWPE increasing, the crystallinity of PP decreases greatly and the crystallinity of UHMWPE improves. But because of poor flowability of UHMWPE, the perfection degree of UHMWPE crystallizing is lower than that of PP; The system is two-phase structure. SEM testing shows: UHMWPE with PP forms" physical cross-linked network", but doesn't scatter molecularly. Polarizing microscope testifies the results of DSC testing from micromolecular aspect.