Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.ces.2012.10.004
Title: Fabrication of porous and interconnected PBI/P84 ultrafiltration membranes using [EMIM]OAc as the green solvent
Authors: Xing, D.Y.
Chan, S.Y. 
Chung, T.-S. 
Keywords: Hydrogen bonded interconnected network
Ionic liquid
Non-Newtonian flow
P84
Polybenzimidazole
Ultrafiltration membranes
Issue Date: 14-Jan-2013
Source: Xing, D.Y., Chan, S.Y., Chung, T.-S. (2013-01-14). Fabrication of porous and interconnected PBI/P84 ultrafiltration membranes using [EMIM]OAc as the green solvent. Chemical Engineering Science 87 : 194-203. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ces.2012.10.004
Abstract: In this study, we aimed to design PBI (poly-2,2'-(m-phenylene)-5,5'-bibenzimidazole) blend membranes with a higher water flux by using a less amount of the expensive PBI material and by employing environmentally friendly ionic liquids as the solvent. Five commercially available polyimides and polyimide-amides were screened and P84 (BTDA-TDI/MDI, co-polyimide of 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 80% methylphenylenediamine +20% methylenediamine) was chosen to blend with PBI because it formed miscible blends with PBI and interacted closely with the ionic liquid of 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc). An interesting interconnected network of the PBI/P84/[EMIM]OAc solution was evolved based on the highly charge-ordered characteristics of [EMIM]OAc. The blend solution displayed unusual rheological behavior: an initial shear thinning behavior under low shear rates followed by a Newtonian plateau. The incorporation of P84 in the blend system not only lowered the overall viscosity for easier membrane fabrication but also retarded the phase inversion process favorably to form a macrovoid-free morphology. PBI/P84 blend membranes were therefore fabricated for ultrafiltation via non-solvent induced phase inversion method. The effects of PBI/P84 composition and casting temperature on membrane morphology and separation performance were studied according to their phase inversion mechanisms. Compared to plain PBI ultrafiltration membranes, the newly developed PBI/P84 blend membranes exhibit an open cell structure and a reduced thickness which leads to a 50% higher pure water permeability and a larger pore diameter. © 2012 Elsevier Ltd.
Source Title: Chemical Engineering Science
URI: http://scholarbank.nus.edu.sg/handle/10635/63910
ISSN: 00092509
DOI: 10.1016/j.ces.2012.10.004
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

12
checked on Dec 14, 2017

WEB OF SCIENCETM
Citations

11
checked on Nov 18, 2017

Page view(s)

49
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.