Alignment of carbon nanotubes in ultra-long carbon nanotube polymethylmethacrylate composite nanofibers by electrospinning
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摘要: 将流速梯度场与静电纺丝设备相结合，利用原位本体聚合方法，制备了超长的PMMA/CNT复合纳米丝，并实现了纳米丝的有序收集和CNTs在其内部的定向排列。通过SEM、FT-IR、TEM检测表明所制备的超长复合纳米丝直径约为100nm，长度可达数米，且光滑连续、平行排列；CNTs在复合纤维中均匀分散，沿轴向平行排列，且与PMMA分子间存在化学键；CNTs质量分数为8%时，复合纤维电导率比纯PMMA提升了10个数量级；通过偏振拉曼光谱得到了CNTs的定向因子；分析了石英毛细管内部纺丝液对CNTs取向一致的诱导作用。
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关键词:
- 超长纳米纤维 /
- 碳纳米管定向 /
- Poiseuille流 /
- 静电纺丝 /
- 偏振拉曼光谱分析
Abstract: Carboxylated carbon nanotube-filled polymethylmethacrylate (CNT/PMMA) ultra-long composite nanofibers were prepared by electrospinning of in-situ polymerized CNT/PMMA bulk composites under shear flow in a quartz capillary tube. They were characterized by SEM, TEM and FT-IR. The degree of orientation of the CNTs in the nanofibers was investigated by polarized Raman spectroscopy. The force imposed on CNTs by the poiseuille flow was analyzed. Results indicate that the nanofibers are smooth with a diameter of around 100 nm and a uninterrupted length of several meters. The CNTs in them are well dispersed and highly aligned parallel to the fiber axis. Chemical bonding between the carboxylated CNTs and PMMA is found. The electrical conductivity of the nanofibers is increased by 10 orders of magnitude by adding 8 mass% of CNTs. The alignment of CNTs in the nanofbers was induced by the shear force of PMMA on CNTs during the electrospinning. -
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