Anomalous Mechanical Anisotropy of Form Polypropylene Sheet with N,N’-dicyclohexyl-2,6-naphthalenedicarboxamide
Anomalous Mechanical Anisotropy of Form Polypropylene Sheet with N,N’-dicyclohexyl-2,6-naphthalenedicarboxamide
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发表时间：
2020
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通讯作者：
S. Nobukawa;Y. Uchiyama;M. Yamaguchi;P. Phulkerd
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作者：
S. Nobukawa;Y. Uchiyama;M. Yamaguchi;P. Phulkerd
通过在特定的针状成核剂 N,N'-二环己基-2,6-萘二甲酰胺上进行行成核，可以获得一种挤出聚丙烯 (PP) 片材，其中 PP 分子的链轴和结晶片层都垂直于流动方向取向。该片材的动态拉伸模量表现出反常各向异性，其中在较低温度下，纵向（MD）的储能模量低于横向（TD）的储能模量，而这种行为在高温下相反。拉伸试验表明，MD 方向的杨氏模量和屈服应力高于 TD 方向。相反，在高应变率下，TD 方向的断裂应变明显大于 MD 方向的断裂应变。
An extruded polypropylene (PP) sheet in which both the chain-axes of the PP molecules and the crystalline lamellae are oriented perpendicular to the flow direction is obtained via row-nucleation on a specific needle-shaped nucleating agent, N,N’-dicyclohexyl-2,6-naphthalenedicarboxamide. The sheet shows anomalous anisotropy in dynamic tensile modulus, in which, at lower temperatures, the storage modulus in the machine direction (MD) is lower than that in the transverse direction (TD), and this behavior reverses at high temperature. Tensile tests reveal that the Young’s modulus and yield stress in the MD are higher than those in the TD. At high strain rate, the strain at break in the TD is, in contrast, markedly larger than that in the MD.