Anisotropic multilayer conductive networks in carbon nanotubes filled polyethylene/polypropylene blends obtained through high speed thin wall injection molding
Anisotropic multilayer conductive networks in carbon nanotubes filled polyethylene/polypropylene blends obtained through high speed thin wall injection molding
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通过高速薄壁注射成型获得的碳纳米管填充聚乙烯/聚丙烯共混物中的各向异性多层导电网络
DOI：
10.1016/j.polymer.2013.09.047
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发表时间：
2013-11
期刊：
影响因子：
4.6
通讯作者：
Qiang Fu
中科院分区：
文献类型：
--
作者：
Feilong Yu;Hua Deng;Qin Zhang;Ke Wang;Chaoliang Zhang;Feng Chen;Qiang Fu
为了制备具有各向异性导电网络的复合材料，采用高速薄壁注射成型方法制备了由聚丙烯(PP)和碳纳米管(CNTs)填充聚乙烯(PE)组成的导电聚合物复合材料(CPCS)。形态研究表明，碳纳米管分布在PE相中，同时观察到不同聚合物相交替排列的多层结构以及平行于流动方向的导电网络。为了形成这种交替的层状结构，首先将分散相变形成不连续的层，然后再变形成宽而规则的连续交替层。从机理上看，良好的粘度匹配、不同聚合物组分之间的低界面张力、较短的松弛时间和较高的剪切速率是重要的问题。这些CPC的各向异性导电行为，即纵向(平行于流动方向)和横向(垂直于流动方向)导电，而在厚度方向不导电，这是由于绝缘PP层切断了核心层的导电网络。更重要的是，与具有各向同性导电网络的相同聚合物共混物相比，具有交替多层导电网络的CPC获得了更好的电磁干扰(EMI)屏蔽能力，尽管后者的电阻率要低得多。这表明这些各向异性的CPC在电子应用方面具有巨大的潜力。此外，这项研究还揭示了这种交替多层结构在制备一系列多功能材料方面的潜在用途。
To prepare composites with anisotropic conductive networks, electrical conductive polymer composites (CPCs) consisting of polypropylene (PP) and carbon nanotubes (CNTs) filled polyethylene (PE) are fabricated through high speed thin-wall injection molding. Morphological study demonstrates that CNTs are localized in PE phase while the alternating multilayer structure with different polymer phases elongated as well as conductive network oriented parallel to flow direction is observed. To form such alternating layered structure, the dispersed phases are firstly deformed into discontinuous layers, and finally further deformed into wide and regular continuous alternating layers. In term of the mechanism behind this, the good viscosity match, low interfacial tension between different polymer components, short relaxation time and high shear rate are thought as important issues. The anisotropic conductive behavior of these CPCs, i.e. conductive in longitudinal (parallel to flow direction) and transverse (perpendicular to flow direction) direction but non-conductive in thickness direction, is contributed by the insulating PP layer which cuts off the conductive networks in the core layer. More importantly, much better electromagnetic interference (EMI) shielding ability is obtained for these CPCs with alternating multilayer conductive networks comparing with the same polymer blends with isotropic conductive networks, despite of the fact that much lower resistivity is obtained for the later. This indicates great potential of these anisotropic CPCs for electronic applications. Moreover, this study has shed some light on the potential use of such alternating multi-layered structure to prepare a range of multi-functional materials.
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