고분자 블랜드에서 보여지는 전단 응력으로 인한 혼합과정과 그 이후의 Spinodal Decomposition 현상

반용병; Nakatani AI; Han CC

Polymer(Korea), Vol.17, No.5, 528-536, September, 1993

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고분자 블랜드에서 보여지는 전단 응력으로 인한 혼합과정과 그 이후의 Spinodal Decomposition 현상

Shear-Induced Mixing and Spinodal Decomposition of the PSD/PB/DOP System

반용병, Nakatani AI, Han CC

초록

새로이 제작된 광산란 장치를 이용하여 다양한 전단 속도 하에서 고분자 블렌드 용액의 균일화 현상과 그 이후의 상분리 과정을 관찰하였다. 전체 고분자 농도가 8wt%로 일정한 PSD/PB/DOP계는 전형적인 UCST를 보여주는데, 상온에서는 두 상으로 존재하지만 전단 속도가 329 s^-1 이상에서 흐름으로 인한 균일화가 일어난다. 또한 상분리가 일어나는 조건에서 전단 흐름에 대한 수평과 수직 성분의 q_m과 I_m의 성장 과정이 다르게 관측되었으며, 산란 패턴에서도 지금까지 보고되어져 온 결과와는 다른 비등방형태의 "spinodal ring"이 얻어졌다. 이러한 결과들은 상분리 메카니즘 이론을 정립하는데 필요한 또 하나의 실험 자료가 될 것이다.

Shear-induced homogenization of 8 wt% solutions of deuterated polystyrene and polybutadiene mixtures with off-critical composition was studied by small angle light scattering mothod. In the shear-induced state, the solution was found to be in single phase that the scattering pattern parallel to the flow being significantly supressed by shear, in comparison with those perpendicular to the flow. The early-stage unmixing behavior after the cessation of steady-state shear at S > Sc was also examined, the results of which indicate that anisotropic spinodal drtomposition of the mixture was found with different ordering process of q_m and q_m.

[References]

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Ban YB, Nakatani AI, Han CC, in preparation

[1] Olabisi O, Robeson LM, Shaw MT, "Polymer-Polymer Miscibility," Academic Press, New York (1979)

[2] Utracki LA, "Polymer Alloys and Blends: Thermodynamics and Rheology," Hanser, New York (1989)

[3] Hashimoto T, Kumaki J, Kawai H, Macromolecules, 16, 641 (1983)

[4] Onuki A, Kawasaki K, Phys. Lett., 72, 233 (1979)

[5] Beysens D, Gbadamassi M, Boyer L, Phys. Rev. Lett., 43, 1253 (1979)

[6] Rangel-Nafaile C, Metzner AB, Wissburn KF, Macromolecules, 17, 1187 (1984)

[7] VerStrate G, Philippoff W, J. Polym. Sci. C: Polym. Lett., 12, 267 (1974)

[8] Wolf BA, Makromol. Chem. Rapid Commun., 1, 231 (1980)

[9] Lodge AS, Polymer, 2, 195 (1961)

[10] McHugh AJ, Forrest EH, J. Macromol. Sci.-Phys., 11(2), 219 (1975)

[11] Nakatani AI, Kim H, Takahashi Y, Matshushita Y, Takano A, Bauer B, Han CC, J. Chem. Phys., 93, 795 (1990)

[12] Nakatani AI, Ban YB, Han CC, Presented in Fall Meeting of the American Chemical Society, Washington D.C. (1992)

[13] Hashimoto T, Takebe T, Sawaoka R, J. Chem. Phys., 91, 4369 (1989)

[14] Hindawi I, Higgins JS, Galambos AF, Weiss RA, Macromolecules, 23, 670 (1990)

[15] Rector LP, Mazich KA, Carr SH, J. Macromol. Sci.-Phys., 27, 421 (1988)

[16] Katsaros JD, Malone MF, Winter HH, Polym. Eng. Sci., 29, 1434 (1989)

[17] Lyngaae-Jorgensen J, Sondergaard K, Polym. Eng. Sci., 27, 344 (1987)

[18] Helfand E, Fredrickson GH, Phys. Rev. Lett., 62, 2468 (1989)

[19] Onuki A, Taniguchi Conf. on Polymer Research by Neutron Scattering, Kyoto, Japan, Nov. (1989)

[20] Nakatani AI, Waldow DA, Han CC, Rev. Sci. Instrum., 63(7), 3590 (1992)

[21] Taylor GI, Proc. Roy. Soc. A, 138, 41 (1923)

[22] Taylor GI, Proc. Roy. Soc. A, 146, 501 (1934)

[23] Silbergberg A, Kuhn W, J. Polym. Sci., 13, 21 (1954)

[24] Takebe T, Hashimoto T, Polym. Commun., 29, 227 (1988)

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

[26] Lifshitz IM, Slyozov VV, J. Phys. Chem. Solids, 19, 35 (1961)

[27] Sasaki K, Hashimoto T, Macromolecules, 17, 2818 (1984)

[28] Cahn JW, J. Chem. Phys., 42, 93 (1965)

[29] Hashimoto T, Phase Trans., 12, 47 (1988)

[30] Wolf BA, Macromolecules, 17, 615 (1984)

[31] Onuki A, J. Chem. Phys., 85, 1122 (1986)

[32] deGenne PG, J. Chem. Phys., 72, 4756 (1980)

[33] Ban YB, Nakatani AI, Han CC, in preparation