Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/91673
Title: Relationship between mass ratio of nonsolvent-additive to solvent in membrane casting solution and its coagulation value
Authors: Wang, D. 
Li, K. 
Teo, W.K. 
Keywords: Coagulant
Coagulation value
Mass ratio of nonsolvent-additive to solvent
Membrane casting solution
Precipitation value
Issue Date: 31-Jan-1995
Source: Wang, D.,Li, K.,Teo, W.K. (1995-01-31). Relationship between mass ratio of nonsolvent-additive to solvent in membrane casting solution and its coagulation value. Journal of Membrane Science 98 (3) : 233-240. ScholarBank@NUS Repository.
Abstract: A simple equation has been developed to determine the relationship between the mass ratio of nonsolvent-additive to solvent (R a s) in a membrane casting solution and its coagulation value (Gv) in preparing asymmetric membranes by the wet or the dry/wet phase inversion process. The equation is based on the precipitation values of the nonsolvent-additive (PVa) and the coagulant (PVc) in the binary polymer/solvent system. The validity of this equation was examined with observed experimental results for PESf/NMP/alcohol, PESf/NMP/H2O, PSf/DMAC/alcohol and PSf/DMAC/H2O polymer casting solutions using water or ethanol as the coagulant; and also with the experimental data reported in the literature for the PSf/NMP/PA system using water as the coagulant. The results show that the developed equation describes the observed experimental data very well. This equation may be used to indicate variation of phase separation behavior of the membrane casting solution with a coagulant by the introduction of a nonsolvent-additive in the solution. It can be applied readily for the formulation of composition of the membrane casting solution to make flat-sheet or hollow fiber membranes. The equation may be useful in the study and control of membrane morphology. © 1995.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/91673
ISSN: 03767388
Appears in Collections:Staff Publications

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