Deformation processes of ultrahigh porous multiwalled carbon nanotubes/polycarbonate composite fibers prepared by electrospinning
Deformation processes of ultrahigh porous multiwalled carbon nanotubes/polycarbonate composite fibers prepared by electrospinning
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DOI：
10.1016/j.polymer.2005.06.008
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发表时间：
2005-08-23
期刊：
影响因子：
4.6
通讯作者：
Pötschke, P
中科院分区：
文献类型：
--
作者：
Kim, GM;Michler, GH;Pötschke, P
采用透射电镜（TEM）原位拉伸实验研究了聚碳酸酯/多壁碳纳米管（MWCNTs）静电纺丝复合纤维的力学变形过程。以氯仿为溶剂，通过优化工艺条件，采用静电纺丝法制备了均匀的纳米多孔复合纤维。TEM图像表明，多壁碳纳米管嵌入在纤维中作为单独的元素，高度对齐平行于另一个沿着纤维轴，这使得从聚合物基体的机械负荷转移到多壁碳纳米管更有利。由于单个MWCNT在纤维内的滑移，复合纤维的断裂应变显著增强。此外，纤维表面的纳米孔为纤维在拉伸载荷下的塑性变形提供了应力集中的有效场所，从而形成纳米颈缩。这些独特的特性使静电纺复合纤维非常坚固和坚韧。本文的研究结果为静电纺丝复合纤维作为新型聚合物基复合材料的增强材料提供了一种可行的思路。(c)2005爱思唯尔有限公司保留所有权利。
Mechanical deformation processes of electrospun composite fibers based on polycarbonate with multiwalled carbon nanotubes (MWCNTs) were investigated by in situ tensile tests under transmission electron microscope (TEM) depending on morphology. Using chloroform as solvent and optimizing process conditions, uniform nanoporous composite fibers were generated by electrospinning process. TEM images indicate that the MWCNTs were embedded in the fibers as individual elements, highly aligned parallel to one another along the fiber axis, which makes the mechanical load transfer from the polymer matrix to the MWCNT more favorable. Due to the slippage of individual MWCNTs within the fibers the strain at break of composite fibers is significantly enhanced. In addition, the nanopores on the fiber surface provide the effective sites for stress concentration for the plastic deformation to form nanonecking of fibers under tensile load. Combination of these unique features makes the electrospun composite fibers extremely strong and tough. The results from present work may provide a feasible consideration of such electrospun composite fibers for use as the reinforcing elements in a polymer based composite of a new kind. (c) 2005 Elsevier Ltd. All rights reserved.