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首页> 外文期刊>Journal of Applied Polymer Science >Effects of extrusion process, type and content of clays, and foaming process on the clay exfoliation in HMS PP composites
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Effects of extrusion process, type and content of clays, and foaming process on the clay exfoliation in HMS PP composites

机译：HMS PP复合材料中挤出工艺，粘土类型和含量以及发泡工艺对粘土剥离的影响

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The use of a high melt strength polypropylene (HMS PP) matrix reinforced with layered clays could be very useful to improve the properties of materials produced with processes involving melt stretching, like foaming. The control of the particles structure, that is, the degree of exfoliation and the clay distribution in the polymeric matrix, is the key to achieve the desired properties. In this study, the effects of the extrusion process, the clay type and content, and the foaming process on the morphology of different HMS PP based composites are studied. Both, natural and organomodified clays were used. The extrusion process has a negative effect in the composites containing natural clays as their interlayer distance decreases as the number of extrusion cycles increases. On the contrary, this process improves the intercalation of the organomodified clays. However, in both composites the interlayer spacing decreases when the clay content increases. While a percolated network is formed in the composites containing organomodified clays, no network is formed with the natural clays. Finally, the effect of the foaming process has also been analyzed. The Improved Compression Moulding (ICM) route was used to produce the foamed materials. This technique subjects the materials only to a temperature and a pressure gradient without applying any other external forces that could contribute to the clay exfoliation. In this way, only the effects of foaming and melt stretching are observed. In both composites, an increase in the interlayer distance is observed when the materials are foamed. (C) 2015 Wiley Periodicals, Inc.
机译：使用由层状粘土增强的高熔体强度聚丙烯（HMS PP）基体对于改善由涉及熔体拉伸（例如发泡）的工艺生产的材料的性能非常有用。颗粒结构的控制，即剥离程度和聚合物基体中粘土的分布，是获得所需性能的关键。在这项研究中，研究了挤出过程，粘土类型和含量以及发泡过程对不同HMS PP基复合材料形态的影响。天然和有机改性的粘土都被使用。挤出过程对含天然粘土的复合材料具有负面影响，因为随着挤出循环次数的增加，其层间距离会减小。相反，该方法改善了有机改性粘土的插层。然而，在两种复合物中，当粘土含量增加时，层间间距减小。尽管在包含有机改性粘土的复合材料中形成了渗透网络，但与天然粘土没有形成网络。最后，还分析了发泡过程的影响。使用改进的压缩成型（ICM）路线生产泡沫材料。该技术仅使材料经受温度和压力梯度，而不施加可能导致粘土剥落的任何其他外力。这样，仅观察到发泡和熔体拉伸的效果。在两种复合材料中，当材料发泡时，观察到中间层距离的增加。 （C）2015年Wiley Periodicals，Inc.

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