Abstract
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.