고분자용액의 물성이 수면전개 박막의 두께에 미치는 영향

남석태; 한명진; 최호상; 박영태

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.2, 200-206, April, 1998

Effect of Physical Properties of Polymer Solution on the Thickness of Ultrathin Membrane Prepared by Water Casting Method

남석태, 한명진, 최호상, 박영태

초록

수면전개법에 의해 제조된 박막의 두께에 대한 고분자용액의 표면장력과 점도의 영향을 검토하였다. 수면에서 고분자용액의 전개는 고분자용액의 표면장력과 점도에 의해 지배되며, 수면전개 박막의 두께도 이들 인자의 영향을 받는다. 고분자의 농도가 증가함에 따라 고분자용액의 표면장력과 점도는 증가하였으며, 표면장력의 크기는 PVC>PS>CA이었고, 점도의 크기는 CA>PS>PVC 였다. 고분자용액의 수면전개시 물과 고분자용액의 점도영향이 표면장력에 의한 영향 보다도 더 컸으며, 수면 전개 박막의 두께는 PS>CA>PVC 순으로 두꺼웠다.

The effect of surface tension and viscosity of polymer solution on the thickness of water casting membranes was studied. Spreading of polymer solutions on water surface was governed by the surface tension and viscosity of the polymer solution. The thickness of water casting membrane was affected by these two factors. The properties, mentioned above, were proportional to the polymer concentration. The order of magnitude in surface tension was PVC>PS>CA and that of viscosity was CA>PS>PVC. The difference of surface tension between water and polymer solution acts as driving force for spreading of polymer solution, but the viscosity as resistance. The thickness of polymeric membrane prepared by water casting was PS>CA>PVC. The order of membrane thickness was not as same as that of surfaca tension. This phenomena were due to the viscosity which acts as more effective spreading resistance than the surface tension.

[References]

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[1] Lonsdale HK, J. Membr. Sci., 10, 81 (1982)

[2] Gardner RJ, Grane RA, Hannan JF, Chem. Eng. Prog., 73, 76 (1977)

[3] Hwang ST, Thorman JM, AIChE J., 26, 558 (1980)

[4] Albrecht O, Laschewsky A, Ringsdorf H, J. Membr. Sci., 22, 187 (1985)

[5] Adamson AW, "Physical Chemistry of Surfaces," John Wiley and Sons (1982)

[6] Ward WJ, Browall WR, Salemme RM, U.S. Patent, 3,874,986

[7] Browall WR, Ward WJ, U.S. Patent, 4,155,793

[8] Skeist I, Miron J, "Handbook of Adhesive," 3rd. Ed., VNR, N.Y. (1977)

[9] Davis JT, Rideal EK, "Interfacial Phenomena," Academic Press, N.Y. (1963)

[10] Van Krevelen DW, "Properties of Polymers," Elsevier (1976)