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Effect of molecular weight on molecular orientation and morphology of polypropylene sheets containing a β‐nucleating agent
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-11-03 , DOI: 10.1002/pen.25580 Panitha Phulkerd 1 , Atsuro Yamazaki 1 , Shohei Iwasaki 2 , Masayuki Yamaguchi 1
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-11-03 , DOI: 10.1002/pen.25580 Panitha Phulkerd 1 , Atsuro Yamazaki 1 , Shohei Iwasaki 2 , Masayuki Yamaguchi 1
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In this study, polypropylene (PP) films containing the β nucleating agent, N,N′‐dicyclohexyl‐2,6‐naphthalenedicarboxamide, were prepared using PP with three different molecular weights (low, medium, and high) by extrusion process with T‐shaped die. The structure and morphology of the films were studied after stretching. It was found that a unique molecular orientation, in which both the c‐axis and crystalline lamellae were oriented perpendicular to the flow direction, was formed in all undrawn film samples, irrespective of the molecular weights of the PP. In the PP sheets stretched in the machine direction, the low‐molecular‐weight sample containing the nucleating agent exhibited brittle properties owing to a lack of tie chains in the stretching direction. In contrast, cavitation was prominent in the medium (M‐PP)‐ and high (H‐PP)‐molecular‐weight samples. Notably, M‐PP containing the nucleating agent, with a high degree of molecular orientation, promoted the formation of a large number of voids. In H‐PP containing the nucleating agent, the presence of numerous tie chains inhibited cavitation, resulting in fewer voids. The experimental results demonstrated the influence of the molecular weight on the void structure, which will be useful in the field of microporous membranes.
中文翻译：
分子量对含β成核剂的聚丙烯片材分子取向和形态的影响
在这项研究中，使用具有三种不同分子量（低，中和高）的PP通过T挤压工艺制备了包含β成核剂N， N'-dicyclohexyl-2,6-萘二甲酰胺的聚丙烯（PP）膜。形模具。拉伸后研究膜的结构和形态。结果发现，一种独特的分子取向，其中两个Ç在所有未拉伸的薄膜样品中均形成了垂直于流动方向的轴和结晶薄片，而与PP的分子量无关。在纵向拉伸的PP片材中，含有成核剂的低分子量样品由于在拉伸方向上没有连接链而表现出脆性。相比之下，中分子量（M-PP）和高分子量（H-PP）样品中的空化现象很明显。值得注意的是，含有成核剂的M-PP具有高度的分子取向，从而促进了大量空隙的形成。在含有成核剂的H-PP中，大量连接链的存在抑制了空化作用，从而减少了空隙。实验结果证明了分子量对空隙结构的影响，
更新日期：2020-11-03
中文翻译：
分子量对含β成核剂的聚丙烯片材分子取向和形态的影响
在这项研究中，使用具有三种不同分子量（低，中和高）的PP通过T挤压工艺制备了包含β成核剂N， N'-dicyclohexyl-2,6-萘二甲酰胺的聚丙烯（PP）膜。形模具。拉伸后研究膜的结构和形态。结果发现，一种独特的分子取向，其中两个Ç在所有未拉伸的薄膜样品中均形成了垂直于流动方向的轴和结晶薄片，而与PP的分子量无关。在纵向拉伸的PP片材中，含有成核剂的低分子量样品由于在拉伸方向上没有连接链而表现出脆性。相比之下，中分子量（M-PP）和高分子量（H-PP）样品中的空化现象很明显。值得注意的是，含有成核剂的M-PP具有高度的分子取向，从而促进了大量空隙的形成。在含有成核剂的H-PP中，大量连接链的存在抑制了空化作用，从而减少了空隙。实验结果证明了分子量对空隙结构的影响，
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