Thermally-Induced Phase Separation Mechanism Study for the Preparation of Semicrystalline Polymeric Membranes

Cho IS; Kim JH; Kim SS

Korea Polymer Journal, Vol.5, No.3, 191-198, September, 1997

Thermally-induced phase separation mechanisms were investigated for the structure control of the semicrystalline polymeric membrane. Isotactic polypropylene showed the better resistance to the organic solvents than the other polymers for membrane materials tested in this work. Depending on the location in the phase diagram each sample had its own phase separation mechanism to result in the unique structure. The sample structure depended on the competitive liquid-liquid phase separation and polymer crystallization. The initial polymer composition, quench depth, cooling rate and the holding time in the liquid-liquid phase separation region had great influences on the structure formation. Interpretations of the structure formation based on the mechanism study were performed.

[References]

Hiatt WC, Vitzhum GH, Wagner KB, Gerlach K, Josefiak C, AIChE Symposium Series. 261, 84, 28 (1985)
Flory PJ, Principles of Polymer Chemistry, Cornell University Pree, Ithaca (1965)
Castro AJ, U.S. Patent, 4,247,498 assigned to Akzona, Inc. (1980)
Caneba GT, Soong DS, Macromolecules, 18, 2535 (1985)
Caneba GT, Soong DS, Macromolecules, 18, 2545 (1985)
Lloyd DR, Barlow JW, Kinzer KE, AIChE Symposium Series 261, 84, 28 (1989)
Kim SS, Lloyd DR, J. Membr. Sci., 64, 13 (1991)
Song SW, Torkelson JM, Macromolecules, 27(22), 6389 (1994)
Laxminarayan A, Mcguire KS, Kim SS, Lloyd DR, Polymer, 35(14), 3060 (1994)
Tsai FJ, Torkelson JM, Macromolecules, 23, 775 (1990)
Chou YC, Goldburg WI, Phys. Rev., A, 20, 2105 (1979)
Siggia, Phys. Rev., A, 20, 595 (1979)
Furukawa H, Adv. Phys., 34, 703 (1985)

[Referenced By]

[1] Hiatt WC, Vitzhum GH, Wagner KB, Gerlach K, Josefiak C, AIChE Symposium Series. 261, 84, 28 (1985)

[2] Flory PJ, Principles of Polymer Chemistry, Cornell University Pree, Ithaca (1965)

[3] Castro AJ, U.S. Patent, 4,247,498 assigned to Akzona, Inc. (1980)

[4] Caneba GT, Soong DS, Macromolecules, 18, 2535 (1985)

[5] Caneba GT, Soong DS, Macromolecules, 18, 2545 (1985)

[6] Lloyd DR, Barlow JW, Kinzer KE, AIChE Symposium Series 261, 84, 28 (1989)

[7] Kim SS, Lloyd DR, J. Membr. Sci., 64, 13 (1991)

[8] Song SW, Torkelson JM, Macromolecules, 27(22), 6389 (1994)

[9] Laxminarayan A, Mcguire KS, Kim SS, Lloyd DR, Polymer, 35(14), 3060 (1994)

[10] Tsai FJ, Torkelson JM, Macromolecules, 23, 775 (1990)

[11] Chou YC, Goldburg WI, Phys. Rev., A, 20, 2105 (1979)

[12] Siggia, Phys. Rev., A, 20, 595 (1979)

[13] Furukawa H, Adv. Phys., 34, 703 (1985)