关键词: 屈服伸长率, 应力集中, 脆韧转变, 改性聚丙烯

Abstract: The effects of PP resin, talc mesh and content, POE and HDPE on yield extensibility of modified polypropylene were studied. The results show that the yield extensibility of modified polypropylene is related to the stress concentration. The more the stress concentration points in the system, the lower the yield extensibility. For the fixed formulation system, the yield extensibility of PP increased with the decrease of melt flow rate; with the increase of talc mesh, the yield extensibility of the material decreases, and with the decrease of talc content, the yield extensibility increases; with the increase of POE melt index, the yield extensibility increases gradually; a small amount of HDPE can lead to a significant increase in yield extensibility. It was found that the improvement of rubber dispersion was beneficial to the increase of yield extensibility in the fixed formulation system, and the effect of yield extensibility on brittle-ductile transition was verified by modification technology and formulation design.

Key words: Yield extensibilit, Stress concentration, Brittle-ductile transition, Modified polypropylene