The preparation of multilayered structures has been thought as a complicated process until our recent study illustrating an effective method through high speed thin wall injection molding (HSTWIM) of polypropylene (PP) and polyethylene (PE) based blends. Current study investigates the effect of blends composition as well as the addition of carbon nanotubes (CNT) on the structure and properties of these blends. It is observed that a close ratio of high density polyethylene (HDPE) and impact copolymer polypropylene (ICP) triggers the formation of a multilayered structure. Meanwhile, PE is migrated into the rubber phase in ICP, leading to the distribution of some rubber phase on the interface between PP and PE, which is thought as beneficial for the interfacial interaction. Meanwhile, epitaxial growth of PE crystals on PP substrate is also observed. The presence of rubber phase on the interface, multilayered structure and epitaxial growth of PE crystals on PP are thought to be responsible for the observed mechanical enhancement in tensile strength as well as strain at break. Furthermore, the addition of CNTs leads to enhanced strength, reduced strain at break and anisotropic conductive network.

多层结构的制备一直被认为是一个复杂的过程，直到我们最近的研究表明了通过聚丙烯（PP）和聚乙烯（PE）的共混物的高速薄壁注射成型（HSTWIM）的有效方法。当前的研究调查了共混物组成以及碳纳米管（CNT）的添加对这些共混物的结构和性能的影响。可以看出，高密度聚乙烯（HDPE）和抗冲共聚物聚丙烯（ICP）的紧密比例会触发多层结构的形成。同时，PE在ICP中迁移到橡胶相中，导致一些橡胶相在PP和PE之间的界面上分布，这被认为有利于界面相互作用。同时，还观察到在PP衬底上PE晶体的外延生长。界面上橡胶相的存在，多层结构以及PP上PE晶体的外延生长被认为是所观察到的拉伸强度以及断裂应变机械增强的原因。此外，碳纳米管的添加可提高强度，降低断裂应变和各向异性导电网络。