奈米碳管/氯化鋰/聚丙烯腈複合材料之電紡絲製備

Fabrication of Carbon nanotubes/LiCl/Polyacrylonitrile composite fiber by electrospinning

吳佩霖(Pei-Lin Wu)

指導教授 ： 徐文光

國立清華大學/工學院/材料科學工程學系/碩士(2009年)

摘要

電紡絲是一種簡單製備微米/奈米級纖維的方法，而增進導電性是複合纖維應用的目標之一。一般高分子複合材料導電機制可分為電子導電與離子導電，本實驗中經由兩種不同導電機制的材料作為添加物，使用奈米碳管與氯化鋰，製備成聚丙烯腈電紡複合纖維。
將多壁奈米碳管(MWCNTs)、酸化奈米碳管(acidized-MWCNTs)及氯化鋰製成CNTs/PAN、LiCl/PAN、CNTs/LiCl/PAN複合纖維。由SEM及TEM探討實驗參數對纖維形貌影響、DTA/TGA了解纖維的熱穩定性、四線量測法獲得纖維的導電性與I-V 曲線，探討複合載子對於導電機制的影響，以及碳管酸化處理對於導電表現造成的差異。
實驗結果顯示，加入3%酸化奈米碳管，相較原先含15%或20%
LiCl/PAN電紡纖維導電性上升至少10倍，表示酸化處理後的碳管接上的羧基有助於鋰離子於聚丙烯腈內的移動，使導電性增加。

關鍵字

奈米碳管 ； 氯化鋰 ； 電紡絲

並列摘要

Electrospinning is a convenient method to fabricate micro/nano fibers. However, artificial fiber has problems with its low conductivity. The conduction mechanism of polymer composites includes electronic conduction and ionic conduction. In this thesis, we prepared polyacrylonitrile(PAN) electrospun fiber with two different conduction mechanism additives: Carbon nanotubes(CNTs) and LiCl.

We used MWCNTs, acidized-MWCNTs and LiCl to fabricate CNTs/PAN、LiCl/PAN and CNTs/LiCl/PAN composite fiber. The morphology and thermal properties of fiber was investigated by SEM, TEM and DTA/TGA. Four-wire method was used to measure the conductivity and I-V curves. We discussed the conductivity mechanism of complex carriers and the effects on conductivity caused by adding acidized-MWCNTs.

With 3% acidized-MWCNTs addition, the conductivity of composite fiber based on 15% or 20% LiCl/PAN solution can increase more than ten times. The results show that the carboxylic group of acidized-MWCNTs can improve the lithium ion mobility in polyacrylonitrile.

並列關鍵字

carbon nanotubes ； electrospinning ； electrospun ； LiCl

參考文獻

[32] 李惠菁, 多壁奈米碳管/聚乙烯醇高分子複合材料合成與物性分析研究, 國立清華大學材料科學工程學系碩士論文 (2008)

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