High impact polypropylene with the melt flow index about 20 g/10 min and 30 g/10 min were prepared by reactive extrusion using three peroxides (3, 6, 9-Triethyl-3, 6, 9-trimethyM, 4, 7-triperoxynonane, Cyclic; 2, 5-dimethyl-2, 5"di( t-butylperoxy) hexane, D25; dicumyl peroxide, DCP) and the morphology and mechanical properties of the products were investigated. The results showed that the impact property of the degradation products for hiPP/Cyclic system was better than those of hiPP/DCP and hiPP/ D25 systems. DSC and SEM results showed that the size of dispersed phases of hiPP/Cyclic system was smaller, the distribution of dispersed phases was homogeneous, and the compatibility between the matrixes was better, resulting in its good impact property.%采用环酮类过氧化物3,6,9-三乙基-3,6,9-三甲基-1,4,7-三过氧壬烷(Cyclic),芳香族过氧化物过氧化二异丙苯(DCP)和脂肪族过氧化烷烃2,5-二甲基-2,5(二叔丁基过氧基)己烷(D25)通过反应挤出制备熔体质量流动速率分别为20 g/10 min和30 g/10 min左右的高流动抗冲聚丙烯(PP).对产物的形态结构与力学性能进行了分析.结果表明:hiPP/Cyclic体系降解产物的冲击性能明显优于hiPP/D25和hiPP/DCP体系.结合热分析(DSC)和扫描电子显微镜(SEM)观察表明:hiPP/Cyclic降解产物的分散相尺寸小,分布均匀,和基体PP具有良好的相容性,是导致其冲击性能较好的主要原因.
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