Please use this identifier to cite or link to this item:
|Title:||The rheology of Torlon® solutions and its role in the formation of ultra-thin defect-free Torlon® hollow fiber membranes for gas separation|
|Authors:||Peng, N. |
Torlon® poly(amide imide)
|Citation:||Peng, N., Chung, T.-S., Lai, J.-Y. (2009-01-20). The rheology of Torlon® solutions and its role in the formation of ultra-thin defect-free Torlon® hollow fiber membranes for gas separation. Journal of Membrane Science 326 (2) : 608-617. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2008.10.038|
|Abstract:||Fundamental understanding of the material science and rheological engineering to fabricate Torlon® 4000T-MV and 4000TF hollow fiber membranes with an ultra-thin and defect-free dense-selective layer for gas separation has been revealed. We have firstly investigated the rheology of Torlon® 4000T-MV and 4000TF dope solutions, and then determined the effect of temperature-correlated shear and elongational viscosities on the formation of Torlon® fibers for gas separation. Interestingly, Torlon® 4000T-MV and 4000TF possess different rheological characteristics: the elongational viscosity of Torlon® 4000T-MV/NMP solution shows strain thinning, while Torlon® 4000TF/NMP solution shows strain hardening. The balanced viscoelastic properties of dope solutions, which are strongly dependent on the spinning temperature, have been found to be crucial for the formation of a defect-free dense layer. The optimum rheological properties to fabricate Torlon® 4000T-MV/NMP hollow fibers appear at about 48-50 °C, and the resultant fibers have an O2/N2 selectivity of 8.37 and an apparent dense layer thickness of 781 Å. By comparison, the best Torlon® 4000TF fibers were spun at 24 °C with an O2/N2 selectivity of 8.96 and a dense layer of 1116 Å. The CO2/CH4 selectivity of the above two Torlon® variants is 47 and 53.5, respectively. © 2008 Elsevier B.V. All rights reserved.|
|Source Title:||Journal of Membrane Science|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jun 14, 2018
WEB OF SCIENCETM
checked on May 9, 2018
checked on May 25, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.