Control of Phase Separation Temperature of Polymer Blends by Copolymer Blending Method

Lee MS; Choi YO; Jo WH

Korea Polymer Journal, Vol.4, No.1, 30-38, April, 1996

The study was performed to justify experimentally a copolymer blend model, which is based on the Prigogine-Flory-Patterson''s equation of state theory. The blend of poly(vinyl chloride) (PVC) and poly(methyl methacrylate) (PMMA) is selected as model blend system: n-butyl acrylate (nBA) as comonomer is incorporated into PMMA. The cloud point of PVC/PMMA blend first increases with the nBA content, goes through a maximum and then decreases to the cloud point of PVC/PnBA blend of 145 ℃. This means that the nBA units chosen as comonomers are effective in elevating the cloud point of PVC/PMMA blend. The effect of nBA content on the cloud point of PVC/PMMA blend was interpreted in terms of a copolymer blend model based on the Prigogine-Flory-Patterson''s equation of state theory. The elevation of the cloud points with the nBA content is mainly due to an increase of the strength of interaction, which is caused by th addition of nBA units in the MMA/nBA units added are effective in reducing the difference in characteristic temperatures of blend component and thus favorably contribute to elevating the cloud points of PVC/PMMA blends.

[References]

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[1] tenBrinke G, Karasz FE, MacKnight WJ, Macromolecules, 16, 1827 (1983)

[2] Paul DR, Barlow JW, Polymer, 25, 487 (1984)

[3] Chien YY, Pearce EM, Kwei TK, Macromolecules, 21, 1616 (1988)

[4] Nishimoto M, Keskkula H, Paul DR, Macromolecules, 23, 3633 (1990)

[5] Kim CK, Paul DR, Polymer, 33, 4929 (1992)

[6] Sanchez IC, Polymer Compatibility and Incompatibility: Principles and Practices, K. Solc., Ed., MMI Symposium Series, Vol. 2, Harwood, New York (1982)

[7] Kammer HW, Acta Polym., 37, 1 (1986)

[8] Kammer HW, Kressler J, Scheller B, Kroschwite H, Naake GC, Acta Polym., 40, 75 (1989)

[9] Kammer HW, Inoue T, Ougizawa T, Polymer, 30, 888 (1989)

[10] Panayiotou CG, Makromol. Chem., 188, 2773 (1987)

[11] Shiomi T, Ishimatsu H, Eguchi T, Imai K, Macromolecules, 23, 4970 (1990)

[12] Shiomi T, Eguchi T, Ishimatsu H, Imai K, Macromolecules, 23, 4978 (1990)

[13] Shiomi T, Imai K, Polymer, 32, 73 (1991)

[14] Jo WH, Lee MS, Macromolecules, 25, 842 (1992)

[15] Lee MS, Lee SC, Chae SH, Jo WH, Macromolecules, 25, 4339 (1992)

[16] Lee MS, Jo WH, Polym.(Korea), 15(5), 584 (1991)

[17] Vorenkamp EJ, tenBrinke G, Meijer JG, Jager H, Challa G, Polymer, 26, 1725 (1985)

[18] Krause S, Polymer Blends, D.R. Paul and S. Newman, Eds., Academic Press, New York, Vol. 1, Chapter 2 (1978)

[19] Walsh DJ, Sham CK, Macromolecules, 22, 3799 (1989)

[20] Tremblay C, Prudhomme RE, J. Polym. Sci. B: Polym. Phys., 22, 1857 (1984)

[21] Patterson D, Robard A, Macromolecules, 11, 690 (1978)

[22] Paul DR, Barlow JW, Polymer, 25, 487 (1984)

[23] Flory PJ, J. Am. Chem. Soc., 87, 1833 (1965)

[24] Utracki LA, Polymer Alloys and Blends: Thermodynamics and Rheology, Oxford Univ., Press, New York, pp. 64 (1990)

[25] Mark JE, Eisenberg A, Graessley WW, Mandelkern L, Samulski ET, Koenig JL, Wignall GD, Physical Properties of Polymer, 2nd Ed., ACS, Washington, D.C., pp. 88 (1993)

[26] Sham CK, Walsh DJ, Polymer, 28, 804 (1987)

[27] Simha R, Wilson PS, Olabisi O, Kolloid Z.Z. Polym., 251, 402 (1973)