Rheological behavior during the phase separation of thermoset epoxy/thermoplastic polymer blends

Hongkyeong Kim; Kookheon Char

Korea-Australia Rheology Journal, Vol.12, No.1, 77-81, March, 2000

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Rheological behavior during the phase separation of thermoset epoxy/thermoplastic polymer blends

Hongkyeong Kim, and Kookheon Char^†

School of Chemical Engineering, Seoul National University, San56-1, Shinlim-dong, Kwanak-gu, Seoul 151-742, KOREA, Korea

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Rheological behavior of thermoset/thermoplastic blends ofepoxy/polyethersulphone (PES) was monitored during curing of the epoxy resin. During the isothermal curing of the mixture, a fluctuation in viscosity just before the abrupt viscosity increase was observed. This fluctuation is found to be due to the phase separation of PES from the matrix epoxy resin during the curing. The experimentally observed viscosity fluctuation is simulated with a simple two phase suspensiomodel in terms of the increase in domain size. The viscosity profiles obtained experimentally at different isothermal curing temperatures are in good agreement with the predictions from the simple model taking into account the viscosity change due to the growth of PES domain and the network formation of the epoxy matrix.

Keywords:epoxy;polyethersulphone;reaction induced phase separation;suspension model;rheology

[References]

Choi SJ, Phys. Fluids, 18, 420 (1975)
Graebling D, Muller R, Palierne JF, Macromolecules, 26, 320 (1993)
Kiefer J, Hilborn JG, Hedrick JL, Polymer, 37(25), 5715 (1996)
Kim BS, Chiba T, Inoue T, Polymer, 34, 2809 (1993)
Kim DH, Kim SC, Polym. Eng. Sci., 31, 289 (1991)
Lee HM, Park OO, J. Rheol., 38(5), 1405 (1994)
Lee H, Kyu T, Macromolecules, 23, 459 (1990)
Riew CK, Kinloch AJ, Toughened Plastics I, American Chemical Society, New York (1992)
Russel WB, Saville DA, Schowalter WR, Colloidal Dispersions (Chapter 14), Cambridge University Press, New York (1989)
Yanovsky YG, Polymer Rheology: Theory and Practice, Chapman & Hall, New York (1993)

[Related Articles]

[1] Choi SJ, Phys. Fluids, 18, 420 (1975)

[2] Graebling D, Muller R, Palierne JF, Macromolecules, 26, 320 (1993)

[3] Kiefer J, Hilborn JG, Hedrick JL, Polymer, 37(25), 5715 (1996)

[4] Kim BS, Chiba T, Inoue T, Polymer, 34, 2809 (1993)

[5] Kim DH, Kim SC, Polym. Eng. Sci., 31, 289 (1991)

[6] Lee HM, Park OO, J. Rheol., 38(5), 1405 (1994)

[7] Lee H, Kyu T, Macromolecules, 23, 459 (1990)

[8] Riew CK, Kinloch AJ, Toughened Plastics I, American Chemical Society, New York (1992)

[9] Russel WB, Saville DA, Schowalter WR, Colloidal Dispersions (Chapter 14), Cambridge University Press, New York (1989)

[10] Yanovsky YG, Polymer Rheology: Theory and Practice, Chapman & Hall, New York (1993)