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International Journal of Polymer Science
Volume 2016 (2016), Article ID 4759150, 8 pages
Research Article

Surface Modification of Asymmetric Polysulfone/Polyethylene Glycol Membranes by DC Ar-Glow Discharge Plasma

1National Research University Project 2014, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
2Material Chemistry Research Center, Department of Chemistry, Faculty of Science, Khon Kaen University, Muang, Khon Kaen 40002, Thailand
3Department of Physics, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
4Membrane Science and Technology Research Center, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand

Received 1 September 2016; Revised 9 November 2016; Accepted 29 November 2016

Academic Editor: Mohd H. D. Othman

Copyright © 2016 Chalad Yuenyao et al. 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.


Polysulfone/polyethylene glycol (PSF/PEG) membranes were prepared by dry/wet phase inversion method. Effects of direct current glow discharge plasma using argon as working gas on morphological structures and gas separation properties of membranes were studied. Alteration of membrane characteristics were analyzed by various techniques like contact angle, scanning electron microscope, Fourier transform infrared spectroscopy, and dynamic mechanical thermal analysis. Gas separation properties were measured in terms of permeation and ideal O2/N2 selectivity. Results showed that hydrophilic and gas separation properties of PSF/PEG membranes increased by plasma surface modification. It was also shown that the dosage of PEG and plasma treatment affected the morphological structures and mechanical and gas separation properties. The macro voids and transmembrane structure disappeared with a little amount of PEG dosage. Pore size and mechanical strength tend to decrease with increasing PEG dosage up to 10 wt%. Glass transition temperature receded from 201.8 to 143.7°C for pure PSF and PSF/PEG with PEG dosage of 10 wt%. O2 and N2 gases permeation through the 10-minute plasma treated membranes tend to increase. However, the permeation strongly dispersed when treatment time was more extended.