Orientation of Well-Dispersed Multiwalled Carbon Nanotubes in Melt-Spun Polymer Fibers and Its Impact on the Formation of the Semicrystalline Polymer Structure: A Combined Wide-Angle X-ray Scattering and Electron Tomography Study

Orientation of Well-Dispersed Multiwalled Carbon Nanotubes in Melt-Spun Polymer Fibers and Its Impact on the Formation of the Semicrystalline Polymer Structure: A Combined Wide-Angle X-ray Scattering and Electron Tomography Study
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熔纺聚合物纤维中分散良好的多壁碳纳米管的取向及其对半晶聚合物结构形成的影响:广角 X 射线散射和电子断层扫描相结合的研究

DOI:
10.1021/ma4001226
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发表时间:
2013
期刊:
影响因子:
5.5
通讯作者:
Weirich
Weirich
中科院分区:
化学1区
文献类型:
--
作者:
Wulfhorst;Steinmann;Dabringhaus;Beckers;Heidelmann;Weirich

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首次利用三维重建技术研究了分散良好的多壁碳纳米管(CNTs)在高速熔融纺丝半结晶聚合物纤维中的取向行为。当地调查技术允许分离来自额外存在的碳纳米管聚集体的贡献。在纤维生产过程中施加的相对较窄的拉伸比范围内,发现了一个过渡区,在该过渡区中,碳纳米管的取向从垂直排列变为平行于纤维轴线排列。聚合物/碳纳米管纳米复合纤维的广角X射线散射测量和力学分析表明,碳纳米管的取向与纤维的结构和力学性能之间存在很强的相关性。结晶性和非晶性高分子链的结晶度、晶体尺寸和相关长度参数等特征量在碳纳米管取向转变区域内发生显著变化,表明合作过程。
The orientation behavior of well-dispersed multiwalled carbon nanotubes (CNTs) within high-speed melt-spun semicrystalline polymer fibers has for the first time been studied using three-dimensional reconstructions from bright-field transmission electron microscopy (TEM) tomography. The local investigation technique allows separating contributions stemming from additionally present CNT aggregates. Over a relatively narrow draw ratio range applied during the fiber production process, a transition region is found, in which the CNTs change their orientation from being aligned perpendicular to being aligned parallel to the fiber axis. Complementary performed wide-angle X-ray scattering measurements and mechanical analysis of the polymer/CNT nanocomposite fibers reveal a strong correlation between the CNT orientation and the structural and mechanical properties of the fibers. Characteristic quantities such as crystallinity, crystal size, and correlation length parameters of crystalline and amorphous polymer chains undergo significant changes within the CNT orientation transition region indicative of a cooperative process.
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