4.6 Article

Cellulose-based membranes via phase inversion using [EMIM]OAc-DMSO mixtures as solvent

Journal

CHEMICAL ENGINEERING SCIENCE
Volume 178, Issue -, Pages 93-103

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2017.12.020

Keywords

Cellulose; Ionic liquid; Diffusion; Phase inversion; Membrane

Funding

  1. Turkish Scientific and Research Council (TUBITAK) [MAG 115M520]
  2. Middle East Technical University Research Fund [BAP-03-04-2015-006]

Ask authors/readers for more resources

Cellulose and cellulose acetate membranes were fabricated by phase inversion from their solutions in 1-ethyl-3-methylimidazolium acetate ([EMIM] OAc), or its mixture with dimethyl sulfoxide (DMSO). Inclusion of DMSO in the solution decreased crystallinity and rejection for both polymers. When cellulose solutions were coagulated in ethanol crystallinity and rejections were lower, and cellulose acetate membranes coagulated in ethanol had a loose, macroporous morphology, which was attributed to the poor nonsolvent strength of ethanol for this polymer. All cellulose membranes, when dried, performed similarly in rejecting Blue Dextran (20 kDa) by over 90% and Bromothymol Blue by around 80%. On the other hand, when these membranes were used without drying, Bromothymol Blue rejections decreased with increasing DMSO content in solution and with changing of nonsolvent from water to ethanol, implying the presence of a microporous structure which collapses to a similar dense structure upon drying for all cases. Phase inversion rate of both polymers was slower in ethanol, which was attributed to the lower diffusivity of ethanol compared to water due to its larger size. The viscosity of the solvent media, which differed by an order of magnitude between [EMIM]OAc and [EMIM]OAc-DMSO mixtures, on the other hand, did not have a measurable influence on the phase inversion rate. (C) 2017 Elsevier Ltd. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available