Please use this identifier to cite or link to this item:
|Title:||Investigation of the fundamental differences between polyamide-imide (PAI) and polyetherimide (PEI) membranes for isopropanol dehydration via pervaporation||Authors:||Wang, Y.
|Keywords:||Asymmetric membrane formation
Substrate facing against the feed solution
|Issue Date:||20-Jun-2008||Citation:||Wang, Y., Jiang, L., Matsuura, T., Chung, T.S., Goh, S.H. (2008-06-20). Investigation of the fundamental differences between polyamide-imide (PAI) and polyetherimide (PEI) membranes for isopropanol dehydration via pervaporation. Journal of Membrane Science 318 (1-2) : 217-226. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2008.02.033||Abstract:||Torlon® 4000TF polyamide-imide (PAI) and Ultem® 1010 polyetherimide (PEI) membranes were fabricated and studied for isopropanol dehydration by pervaporation. The properties of these two materials and the membranes fabricated were tested and compared through different characterizations (DSC, TGA, Goniometer, X-ray diffraction, gas permeation, and water sorption). Compared with PEI dense membranes, PAI dense membranes show a much higher separation factor (up to 3000 at 60 °C) and comparable flux. Higher hydrophilicity, narrower d-space and higher water uptake of PAI membrane confirmed by above characterizations all contribute to its higher pervaporation performance. The pervaporation results of the asymmetric membranes show that the polymer concentration for membrane casting is very important. For both PAI and PEI membranes, dope concentrations equal to or higher than their critical concentrations are essential to produce useful pervaporation membranes. In addition, heat treatment is needed to reduce defects and enhance separation performance. Different operation modes were also studied. The separation using a membrane with porous structure facing against the feed solution shows a much higher separation factor with only a slight decrease of flux. This important phenomenon is explained in terms of the balance between two major contradictory effects: concentration polarization and dense layer swelling. © 2008 Elsevier B.V. All rights reserved.||Source Title:||Journal of Membrane Science||URI:||http://scholarbank.nus.edu.sg/handle/10635/89288||ISSN:||03767388||DOI:||10.1016/j.memsci.2008.02.033|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Nov 25, 2020
WEB OF SCIENCETM
checked on Nov 25, 2020
checked on Nov 29, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.