In this work, a considerable low‐temperature toughness enhancement of isotactic polypropylene (iPP) was achieved by adding 30 wt% ethylene propylene diene monomer rubber (EPDM) as well as traces of β‐nucleating agent (β‐NAs) and carbon nanotubes (CNTs). The impact strength of the iPP/30 wt% EPDM blend with 0.1 wt% β‐NAs reached 6.57 kJ/m² at −20°C, over 2.5 times of pure iPP. A slightly improved impact strength was further found in the β‐nucleated iPP/30 wt% EPDM at the presence of 0.05 wt% CNTs. The presence of traces of CNTs, β‐NAs, and EPDM displayed synergistic low‐temperature toughness reinforcement effect on the iPP blends. The underlying toughening mechanism was attributed to the formation of a great amount of voids and plastic deformation of iPP matrix affected by CNTs, β‐NAs, and EPDM. Our work provided a feasible strategy to significantly increase the low‐temperature toughness of iPP.

中文翻译：

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痕量碳纳米管和β成核剂极大地改善了全同立构聚丙烯/乙烯丙烯二烯单体橡胶共混物的耐低温冲击性能

在这项工作中，通过添加30 wt％的乙烯丙烯二烯单体橡胶（EPDM）以及痕量的β成核剂（β-NAs）和碳纳米管，实现了等规聚丙烯（iPP）的相当大的低温韧性增强（碳纳米管）。iPP / 30 wt％EPDM共混物与0.1 wt％ β-NAs的冲击强度在-20°C下达到6.57 kJ / m ² ，是纯iPP的2.5倍。β-成核iPP / 30 wt％进一步发现冲击强度略有提高 EPDM在0.05 wt％CNT的存在下。痕量的CNT，β-NAs和EPDM的存在对iPP共混物表现出协同的低温韧性增强作用。潜在的增韧机理归因于iPP基质的大量空隙的形成和塑性变形，这些基质受到CNT，β-NAs和EPDM的影响。我们的工作提供了切实可行的策略，可以显着提高iPP的低温韧性。