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首页> 外文期刊>Journal of Applied Polymer Science >Study on morphology development for in situ fiber-reinforced composites by blending polyolefin and polycaprolactone
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Study on morphology development for in situ fiber-reinforced composites by blending polyolefin and polycaprolactone

机译：聚烯烃与聚己内酯共混制备原位纤维增强复合材料的形貌研究

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摘要

The morphology developments and interfacial properties of extruded polyethylene/polycaprolactone and polypropylene/polycaprolactone blends were investigated. The interfacial thicknesses of both polymer blends were thin and this was investigated by interfacial tension measurement in the melt state. The aspect of boundary area was observed by AFM, and a clear line could be observed at the interface area as a result of thin interfacial thickness. The in situ fiber formation of the dispersed phase was remarkably generated under elongational flow (between die exit and solidification) rather than under shear flow (in the cylinder and die). Drawing ratio was varied at three levels to study its effect on elongation of the dispersed phases. The dispersions dramatically changed from spherical to spheroidal and filament shapes depending on the drawing ratio. Reduced capillary number (Ca*) was used to characterize droplet deformation. The deformation mode under shear flow was classified as nondeformation mode due to the fact that the Ca* was almost 0. On the other hand, the deformation mode under elongational flow was classified into filament shape mode (Ca* > 4). This classification was in agreement with the SEM images. The tensile properties were increased at the border line where the Ca* was 4.0. The melt interfacial tensions of polyolefin/polycaprolactone were relatively large, and a clear line could be observed at the interface area as a result of little affinity of polymer interface. (c) 2005 Wiley Periodicals, Inc.
机译：研究了挤出的聚乙烯/聚己内酯和聚丙烯/聚己内酯共混物的形态发展和界面性能。两种聚合物共混物的界面厚度都很薄，这是通过在熔融状态下的界面张力测量研究的。通过AFM观察边界区域的外观，并且由于界面厚度薄而在界面区域可以观察到清晰的线。分散相的原位纤维形成是在伸长流下（在模头出口和凝固之间）而不是在剪切流下（在圆筒和模头内）显着产生的。拉伸比在三个水平上变化以研究其对分散相的伸长率的影响。分散体根据拉伸比从球形急剧变化为球形和长丝形状。减少的毛细管数（Ca *）用于表征液滴变形。由于Ca *几乎为0，因此剪切流下的变形模式被分类为非变形模式。另一方面，伸长流下的变形模式被分类为细丝形状模式（Ca *> 4）。该分类与SEM图像一致。在Ca *为4.0的边界线处，拉伸性能增加。聚烯烃/聚己内酯的熔体界面张力相对较大，由于聚合物界面的亲和力小，在界面区域可以观察到清晰的线条。 （c）2005年Wiley Periodicals，Inc.

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