Journal ArticleDOI
An improved model for mass transfer during the formation of polymeric membranes by the immersion-precipitation process
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TLDR
In this article, an analysis of the ternary diffusion process encountered in the formation of a cellulose acetate polymeric membrane by a direct immersion-precipitation of polymeric solutions in a nonsolvent bath is presented.Abstract:
An analysis is presented, which describes the isothermal ternary diffusion process encountered in the formation of a cellulose acetate polymeric membrane by a direct immersion-precipitation of polymeric solutions in a nonsolvent bath. A material coordinate was employed to derive the mass transfer equations for the membrane solution and the convective mass transfer in the coagulation bath was taken into account by solving the hydrodynamic boundary layer equations. Diffusion coefficients were measured and used to deduce ternary phenomenological coefficients. The computed results are found to agree with the experimental precipitation time and membrane morphologies observed in scanning electron photomicrographs. © 1994 John Wiley & Sons, Inc.read more
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Journal ArticleDOI
Phase-Separation Processes in Polymer-Solutions in Relation to Membrane Formation
TL;DR: In this article, a review of new experimental and theoretical physical research related to the formation of polymeric membranes by phase separation of a polymer solution, and to the morphology of these membranes is presented.
Journal ArticleDOI
Membranes for gas separation
Pratibha Pandey,R.S. Chauhan +1 more
TL;DR: In this paper, the authors give a brief outline of the field that has emerged on the basis of theoretical models on porous as well as non-porous membranes, and discuss mainly the solution cast polymeric membranes.
Journal ArticleDOI
Preparation and characterization of hydrophobic PVDF membranes by vapor-induced phase separation and application in vacuum membrane distillation
TL;DR: In this paper, a symmetric flat-sheet polyvinylidene fluoride (PVDF) was fabricated for use in vacuum membrane distillation (VMD) using the double-layer casting process.
Journal ArticleDOI
Membrane formation mechanism based on precipitation kinetics and membrane morphology: flat and hollow fiber polysulfone membranes
TL;DR: In this article, a qualitative model was proposed to divide the solution in three different layers during the polymer solution mass exchange with the coagulation bath, and each layer is associated with different precipitation kinetics leading to distinct morphologies.
Journal ArticleDOI
Mechanisms of PVDF membrane formation by immersion-precipitation in soft (1-octanol) and harsh (water) nonsolvents
TL;DR: In this article, a quantitative model describing the immersion-precipitation process was considered, and the calculated diffusion trajectory and concentration distribution in the nascent membrane were found to be consistent with the experimental membrane morphologies.
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