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Effect of Fiber Orientation on Ionic Conductivity of Electrospun Polyimide Nanofibers Mats  

Huh, Yang-Il (Faculty of Applied Chemical Engineering, Chonnam National University)
Kim, Young-Hee (WCU Research Team, Department of Polymer-Nano Science and Technology, Chonbuk National University)
Ahn, Jou-Hyeon (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University)
Lee, Hong-Ki (Fuel Cell Regional Innovation Center, Woosuk University)
Nah, Chang-Woon (WCU Research Team, Department of Polymer-Nano Science and Technology, Chonbuk National University)
Publication Information
Elastomers and Composites / v.45, no.1, 2010 , pp. 40-43 More about this Journal
Abstract
In this study, polyimide(PI) nanofibers mats were prepared by electrospinning and three different fiber morphologies of random, uniaxial, and biaxial orientation were prepared by controlling the speed of drum-shaped collector and other parameters. The SEM studies reveal that the aforesaid morphologies were obtained on the nano-fibrous mats prepared. The ionic conductivity was measured using an in-plane type conductivity tester for the PI mats soaked in the mixture of 1M lithium trifluoro-methane-sulfonate and tetra-ethylene glycol dimethyl ether. The ionic conductivity was surprisingly higher for the biaxial PI mats. For the uniaxially-oriented mats, the ionic conductivity was found to be higher in the parallel direction compared to the perpendicular direction of the fiber orientation. A curious cyclic fluctuation was found in the ionic conductivity with time. The observed behavior was explained by considering the distance between fibers and transport speed of ions used in this study.
Keywords
polyimide; nanofibers; ionic conductivity; electrospinning;
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