Diffusion induced phase separation with crystallizable nylons. I. Mass transfer processes for nylon 4,6

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Bulte, A.M.W. and Mulder, M.H.V. and Smolders, C.A. and Strathmann, H. (1996) Diffusion induced phase separation with crystallizable nylons. I. Mass transfer processes for nylon 4,6. Journal of Membrane Science, 121 (1). pp. 37-50. ISSN 0376-7388

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Abstract:Mass transfer during membrane formation by means of phase inversion for a polymeric system with both a solid-liquid and a liquid-liquid equilibrium was studied on the basis of the theory developed by Reuvers and Smolders. During the first moments of immersion in the coagulation bath, the concentrations at the interface between bath and film are governed by the virtual liquid-liquid equilibrium. This equilibrium no longer exists at a larger time scale. The interfacial concentrations as a result of the local liquid-liquid equilibrium during mass transfer are located deeply in the crystallization region or solid-liquid demixing area and after an induction time the solid-liquid phase separation (crystallization) takes place when membranes are formed with an initial polymer concentration of 20% or larger. The calculated initial concentration profiles show a shallow pattern in polymer content for the films with initial concentration of 20 and 25%. From the calculated initial concentration profiles an isotropic morphology in the final membrane can beexpected. A steep increase of the polymer concentration at the interface was observed for the more concentrated filmscorrelated with a skinned morphology in the final membrane.
Item Type:Article
Copyright:© 1996 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/11521
Official URL:http://dx.doi.org/10.1016/0376-7388(96)00163-9
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Metis ID: 106204