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Title: Modeling of asymmetric membrane formation by dry-casting method
Authors: Alsoy Altınkaya, Sacide
Özbaş, Bülent
Keywords: Asymmetric membrane
Cellulose acetate
Dry-cast model
Multicomponent diffusion
Polymeric membranes
Issue Date: Feb-2004
Publisher: Elsevier Ltd.
Source: Alsoy Altınkaya, S., and Özbaş, B. (2004). Modeling of asymmetric membrane formation by dry-casting method. Journal of Membrane Science, 230(1-2), 71-89. doi:10.1016/j.memsci.2003.10.034
Abstract: Many polymeric membranes are produced by phase inversion technique invented by Loeb and Sourirajan in 1962. The dry-casting method is one of the major phase inversion techniques in which a homogeneous polymer solution consisting of solvent(s) and nonsolvent(s) is cast on a support and then evaporation of the casting solution takes place under convective conditions. In this paper, we model membrane formation by the dry-casting method. The model takes into account film shrinkage, evaporative cooling, coupled heat, and mass transfer and incorporates practical and reliable diffusion theory as well as complex boundary conditions especially at the polymer solution/air interface. The predictions from the model provide composition paths, temperature, and thickness of the solution. By plotting the composition paths on the ternary phase diagram, we ascertain the general structural characteristics of the membranes prepared from particular casting conditions. The predictive ability of the model was evaluated by comparing the results with the experimental data obtained from gravimetric measurements for cellulose acetate (CA)-acetone-water system. In an attempt to illustrate the importance of diffusion formalism on the predictions, recently proposed multicomponent diffusion theory and its simplified forms were utilized in the model. The computational results show that the critical factor for capturing the accurate behavior of membrane formation is the diffusion formalism utilized in the model
ISSN: 0376-7388
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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