中文摘要：

利用以拉伸流场为主的叶片挤出机（VE）和以剪切流场为主的双螺杆挤出机（TSE）分别制备了不同组分比的动态硫化三元乙丙橡胶/聚丙烯（EPDM/PP）热塑性弹性体。通过对2种流场作用下共混物的力学性能、结晶熔融行为以及晶体形貌和晶体结构的对比分析,研究了拉伸流场对动态硫化EPDM/PP结构与性能的影响。结果表明,与双螺杆挤出机相比,由于拉伸流场更好的分散混合效,EPDM/PP热塑性弹性体中的PP相能在较低温度结晶,共混物中PP相的晶体尺寸更小,分布更均匀,EPDM 相与PP相界面结合更好,共混物的力学性能得到了显著提高;拉伸流场对EPDM/PP热塑性弹性体中PP相的晶格结构无影响,但对PP的结晶度影响较大。

英文摘要：

Dynamic vulcanized ethylene-propylene-diene terpolymer （EPDM）/ polypropylene （PP） blends with different mass ratios were prepared by a vane extruder（VE）, which generated global dynamic elongational flow, and a twin-screw extruder（TSE）, which generates shear flow. The mechanical properties, crystallization and melting behavior, crystal morphology and crystal structure of the blends were investigated. The effect of elongational flow on the properties of dynamic vulcanized EPDM/PP blends was also studied. The results show that the dispersion mixing effect was improved by vane extruder compared by twin screw extruder. So the crystallization temperature of PP is lower, the spherulite size of PP becomes smaller as well as the size distribution becomes more uniform, and the mechanical properties of the blend are increased significantly. The elongational flow fields have no effect on the lattice structure of the PP but a greater influence on the crystallinity of PP phase in the blend.