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Journal of Nanomaterials
Volume 2011 (2011), Article ID 724153, 10 pages
http://dx.doi.org/10.1155/2011/724153
Research Article

Effect of Changing Solvents on Poly( 𝜺 -Caprolactone) Nanofibrous Webs Morphology

Textile Engineering Department, Amirkabir University of Technology, Tehran 15875-4413, Iran

Received 16 February 2011; Revised 6 April 2011; Accepted 6 April 2011

Academic Editor: Christian Brosseau

Copyright © 2011 A. Gholipour Kanani and S. Hajir Bahrami. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polycaprolactone nanofibers were prepared using five different solvents (glacial acetic acid, 90% acetic acid, methylene chloride/DMF 4/1, glacial formic acid, and formic acid/acetone 4/1) by electrospinning process. The effect of solution concentrations (5%, 10%, 15% and 20%) and applied voltages during spinning (10 KV to 20 KV) on the nanofibers formation, morphology, and structure were investigated. SEM micrographs showed successful production of PCL nanofibers with different solvents. With increasing the polymer concentration, the average diameter of nanofibers increases. In glacial acetic acid solvent, above 15% concentration bimodal web without beads was obtained. In MC/DMF beads was observed only at 5% solution concentration. However, in glacial formic acid a uniform web without beads were obtained above 10% and the nanofibers were brittle. In formic acid/acetone solution the PCL web formed showed lots of beads along with fine fibers. Increasing applied voltage resulted in fibers with larger diameter.