An improved model for mass transfer during the formation of polymeric membranes by the immersion‐precipitation process

Journal of Polymer Science, Part B: Polymer Physics - Tập 32 Số 8 - Trang 1413-1425 - 1994
Liao‐Ping Cheng1, Young S. Soh1, An‐Hwa Dwan1, Carl C. Gryte1
1HKSM Department of Chemical Engineering, Materials Science and Mining Engineering, Columbia University, New York, New York 10027

Tóm tắt

AbstractAn 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.

Từ khóa


Tài liệu tham khảo

10.1021/cr60061a001

S. P.LovellandJ. P.Bush U. S. Patent 2 783 894 (1957).

R.Paine U.S. Patent 3 408 315 (1968).

Mulder M., 1991, Basic Principles of Membrane Technology, 10.1007/978-94-017-0835-7

Strathmann H., 1985, Materials Sciences of Synthetic Membrane

Souriraran S., 1977, Reverse Osmosis and Synthetic Membranes

10.1016/0011-9164(90)85022-3

10.1002/pol.1979.180170312

10.1016/S0376-7388(00)80020-4

10.1016/S0376-7388(00)80021-6

10.1002/polb.1990.090280810

10.1063/1.1661955

10.1002/aic.690290309

10.1021/ma00038a041

10.1039/tf9494500801

Crank J., 1975, The Mathematics of Diffusion

10.1016/S0376-7388(00)85107-8

10.4159/harvard.9780674494121

Haase R., 1969, Thermodynamics of Irreversible Process

Fitts D. D., 1962, Nonequilibrium Thermodynamics

10.1002/aic.690280217

Treybal R. E., 1980, Mass Transfer Operations

Bird R. B., 1960, Transport Phenomena

Schlichting H., 1979, Boundary Layer Theory

10.1021/j100783a005

10.1021/j150562a006

Davis M. E., 1984, Numerical Method and Modeling for Chemical Enginerers

L. P.Cheng Doctoral dissertation Columbia University New York 1993.

Cheng L. P., 1993, J. Polym. Sci.

Tompa H., 1956, Polymer Solutions

10.1002/app.1986.070310404

10.1016/S0376-7388(00)82363-7

10.1016/S0011-9164(00)82092-5

10.1016/S0011-9164(00)88244-2

10.1002/aic.690250102

10.1002/jctb.5010010401

10.1016/0032-3861(81)90292-5

10.1080/00222338908053847

10.1039/tf9615702314

10.1002/app.1965.070090413

10.1016/0376-7388(92)80134-6

10.1111/j.1749-6632.1945.tb36174.x