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首页> 外文期刊>Polymers for advanced technologies >The mechanism for fracture resistance in β-nucleated isotactic polypropylene
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The mechanism for fracture resistance in β-nucleated isotactic polypropylene

机译：β-成核等规聚丙烯的抗断裂机理

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摘要

The effects of molecular weight (MW) of isotactic polypropylene (iPP), the content of β-PP, the size of its spherulites and the morphology of its α-phase and β-phase (α- and β-PP) on the impact strength, with different contents of β-nucleating agent, were investigated by two ways. The results show that the impact strength of iPPs increased initially, and then decreased with the content of β-nucleating agent (maximum at 0.1 wt%). The impact strength was related to the size of β-spherulites and had no apparent correlation with the content of β-PP. The morphology of the bundle shape and intercrossing boundaries of β-spherulites were dominant in improving impact strength with low content of β-nucleating agent, while the MW of iPP was dominant with high content of β-nucleating agent.
机译：等规聚丙烯（iPP）的分子量（MW），β-PP的含量，其球晶的尺寸以及其α相和β相（α-和β-PP）的形态对其影响的影响通过两种方法研究了不同含量的β-成核剂的强度。结果表明，iPPs的冲击强度先增加，然后随β成核剂含量的增加而降低（最大为0.1 wt％）。冲击强度与β-球晶的大小有关，与β-PP的含量没有明显的相关性。 β-成球剂的束形状和交叉边界的形态在降低冲击强度方面占主导地位，而β-成核剂的含量低，而iPP的MW占主导地位，而β-成核剂的含量高。

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