中文摘要：

利用毛细管流变仪、动态流变仪、差示扫描量热仪（DSC）和金相显微镜等研究了三元乙丙橡胶（EPDM）对聚丙烯（PP）熔体性能、PP相对结晶度和泡孔形态的影响。研究结果表明，当EPDM质量分数低于10％时．EPDM／PP共混物具有和PP相似的熔体黏度，但熔体强度和相对结晶度较低。当EPDM质量分数为9．5％时，制得了泡孔密度为2．3×10^5／cm^3、泡孔尺寸为90斗m左右的结构发泡聚丙烯，EPDM显著提高了体系泡孔成核率。

英文摘要：

With capillary rheometer, dynamic rheometer, differential scanning calorimeter （DSC） andmetalloscope, the effect of ethylene propylene diene monomer （EPDM） on melt property of EPDM/PP blends, relative crystallinity of polypropylene （PP） and cell morphology were studied. The results showed that melt strength and relative crystallinity of PP/EPDM blend employed with low content EPDM （ ≤10 wt% ） were lower than the pure PP, meanwhile, the viscosity of the blend melt was rarely influenced by EPDM. When content of EPDM was 9.5 （wt）%, an cellular foam PP with cell density of 2.3 x 105cells/cm3 and cell size of about 90μm was prepared, owing to the promotion of cell nucleation on the interface of PP/EPDM and decreasing of crystallinity of PP/EPDM blend.