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首页> 外文期刊>Journal of Applied Polymer Science >Nonisothermal crystallization and multiple melting behaviors of β-nucleated impact-resistant polypropylene copolymer
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Nonisothermal crystallization and multiple melting behaviors of β-nucleated impact-resistant polypropylene copolymer

机译：β-成核耐冲击聚丙烯共聚物的非等温结晶和多重熔融行为

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摘要

As a substitute of isotactic polypropylene in applications requiring excellent fracture resistance, impact-resistant polypropylene copolymer (IPC) has attracted much attention in recent years. In this study, a highly effective β-form nucleating agent (β-NA; an aryl amide compound) was introduced into IPC, and our attention was focused on the nonisothermal crystallization and subsequent melting behaviors of the nucleated samples. The nonisothermal crystallization behaviors were investigated on the basis of the different cooling rates and different concentrations of β-NA with differential scanning calorimetry, wide-angle X-ray diffraction (WAXD), and polarized optical microscopy. The results show that both the cooling rate and concentration of β-NA greatly determined the nonisothermal crystallization process and subsequent multiple melting behaviors. Further results show that the multiple melting behaviors were related to the transition in β crystallites and those between the β and α crystallites. The morphologies of the dispersed particles and the supermolecular structure of the matrix were characterized with scanning electron microscopy. Finally, the effect of the β-NA concentration on the fracture resistance of IPC was evaluated by measurement of the notched Izod impact strength.
机译：耐冲击聚丙烯共聚物（IPC）作为等规聚丙烯在要求优异的耐断裂性的应用中的替代品，近年来引起了人们的广泛关注。在这项研究中，将一种高效的β型成核剂（β-NA;一种芳基酰胺化合物）引入了IPC，我们的注意力集中在成核样品的非等温结晶和随后的熔融行为上。利用差示扫描量热法，广角X射线衍射（WAXD）和偏振光学显微镜，根据不同的冷却速度和不同的β-NA浓度，研究了非等温结晶行为。结果表明，冷却速度和β-NA的浓度都极大地决定了非等温结晶过程和随后的多重熔融行为。进一步的结果表明，多重熔融行为与β微晶以及β和α微晶之间的转变有关。用扫描电子显微镜表征分散颗粒的形态和基质的超分子结构。最后，通过测量缺口伊佐德冲击强度来评估β-NA浓度对IPC抗断裂性的影响。

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