Abstract
THE behaviour of melts of styrene–butadiene–styrene (SBS) triblock copolymer under oscillatory shear exhibits a marked departure from that of homopolymers in the low frequency range; the dynamic viscosity η′(ω) increases continually with decreasing frequency, rather than exhibiting the Newtonian limiting value η0 expected of true fluids1. This peculiar behaviour has been explained in terms of phase separation which forms a lattice of linked polystyrene domains. Here we present rheological evidence directly demonstrating a thermodynamic transition.
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References
Arnold, K. R., and Meier, D. J., J. appl. Polym. Sci., 14, 427 (1970).
Leary, D. F., and Williams, M. C., J. Polym. Sci. (Polym. Phys. Ed.), 11, 345 (1973); ibid., 12, 265 (1974).
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Pico, E. R., thesis, Univ. California, Berkeley (1976).
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Pico, E., WILLIAMS, M. Viscosity in the phase transition region of triblock copolymer systems. Nature 259, 388–389 (1976). https://doi.org/10.1038/259388a0
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DOI: https://doi.org/10.1038/259388a0
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