Perpendicular orientation between dispersed rubber and polypropylene molecules in an oriented sheet

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An immiscible blend of isotactic polypropylene (PP) and ethylene-butene-1 copolymer (EB) (PP/EB = 70/30) containing a small amount of N,N’-dicyclohexyl-2,6-naphthalenedicarboxamide as a nucleating agent for β-form crystals was prepared by T-die extrusion. We successfully prepared an extruded sheet, in which the orientation of the PP molecules is perpendicular to the deformation of the EB particles; i.e., the β-form crystals of PP are predominantly oriented perpendicular to the flow direction of the sheet plane (the transverse direction, TD), whereas the EB droplets are strongly deformed in the flow direction. It should be noted that the EB barely affects the crystalline form and orientation of PP. This extraordinary structure provides unique mechanical anisotropy. The tear strength in the TD sample is significantly enhanced with the anomalous crack propagation in the machine direction (MD). Moreover, the anisotropy in tensile properties such as Young’s modulus, yield stress, strain at break, and dynamic tensile modulus becomes reduced.

identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/16124

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