Direct Formation of Nanohybrid Shish-Kebab in the Injection Molded Bar of Polyethylene/Multiwalled Carbon Nanotubes Composite
Direct Formation of Nanohybrid Shish-Kebab in the Injection Molded Bar of Polyethylene/Multiwalled Carbon Nanotubes Composite
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DOI：
10.1021/ma901266u
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发表时间：
2009-07
期刊：
影响因子：
5.5
通讯作者：
Jinghui Yang;Chao-yu Wang;Ke Wang;Qin Zhang;Feng Chen;R. Du;Q. Fu
中科院分区：
文献类型：
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作者：
Jinghui Yang;Chao-yu Wang;Ke Wang;Qin Zhang;Feng Chen;R. Du;Q. Fu
纳米杂化碳纳米管超结构的形成是一种将聚合物和碳纳米管结合在一起的新方法，首次在聚乙烯溶液中观察到碳纳米管的存在。采用动态填充注射成型技术(DPIM)在高密度聚乙烯(HDPE)/多壁碳纳米管(MWCNTs)复合材料注射成型棒中直接形成纳米杂化烤串，即在填充凝固阶段对逐渐冷却的熔体施加振荡剪切场。有趣的是，无论碳纳米管的长轴是垂直于还是平行于剪切流动方向，PE片层总是垂直于碳纳米管的长轴。提出了三步成核机制，包括：(1)PE和CNTs的解缠和取向；(2)PE折叠链片直接在CNTs表面成核.
The formation of a nanohybrid shish-kebab (NHSK) superstructure, in which fibrillous carbon nanotubes (CNTs) act as shish while polymer lamellae act as kebab, is a novel way to bond the polymer and CNTs together and was first observed in the solution crystallization of polyethylene in the presence of CNTs. In this work, a direct formation of nanohybrid shish-kebab in the injection molded bar of high-density polyethylene (HDPE)/multiwalled carbon nanotubes (MWCNTs) composite, has been achieved, via a so-called dynamic packing injection molding technology (DPIM), in which oscillatory shear field was imposed on the gradually cooled melt during the packing solidification stage. Interestingly, whatever the long axis of CNTs is perpendicular to or parallel to the shear flow direction, the lamellae of PE is always perpendicular to long axis of CNTs. The three-step mechanism, including (1) the disentanglement and orientation of both PE and CNTs, (2) PE folded-chain lamellae directly nucleated on CNTs surface and/...