Diffusion‐controlled formation of porous structures in ternary polymer systems

Wiley - Tập 17 Số 3 - Trang 477-489 - 1979
Claude Cohen1, G. B. Tanny2, Stephen Prager3
1School of Chemical Engineering, Cornell University, Ithaca, New York 14853
2Department of Plastics Research, The Weizmann Institute of Science, Rehovot Israel
3Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455

Tóm tắt

AbstractWe propose a theory for the appearance of two‐phase structures during the formation of polymer membranes from a casting solution immersed in a coagulant bath. Our model is based on diffusion induced phase separation at the spinodal in the ternary nonsolvent‐solvent‐polymer system. A simplified treatment of the interdiffusion process by the diffusion layer method permits the formulation of criteria for the formation of two‐phase structures in the course of the solvent‐coagulant exchange. Our criteria are expressed in terms of the composition dependence of the chemical potentials in the stable and metastable region of the ternary phase diagram. Comparison with experimental results shows qualitative similarities with theoretical predictions.

Từ khóa


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Wiley

Tập 17 Số 3

477-489

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