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UCST behavior in blend systems of isotactic polystyrene/poly(4-methyl styrene) in comparison with atactic polystyrene/poly(4-methyl styrene)

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Abstract.

Blends of poly(4-methylstyrene) (P4MS) with polystyrene (iPS) exhibit an upper critical solution temperature (UCST) at ca. 270 °C. The overall phase behavior and trend of variation in the phase diagrams for the iPS/P4MS blend system with respect to molecular weights of iPS is similar to an earlier studied blend system of atactic PS with P4MS. This suggests that the crystal phase-related tacticity and crystallinity in iPS does not influence the amorphous phase behavior and UCST behavior of the polymer mixtures. A model based on a modified Flory-Huggins expression for binary interactions was constructed to describe the UCST-type behavior of the iPS/P4MS blend and to compare the qualitative effects of molecular weights on iPS/P4MS blend vs. atactic PS/P4MS systems.

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Acknowledgement.

This study is sponsored by fundamental research grants provided by Taiwan's National Science Council (#NSC90-2216-006-030).

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  1. Department of Chemical Engineering, National Cheng Kung University, 701, Tainan, Taiwan

    L. L. Chang & E. M. Woo

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  1. L. L. Chang
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  2. E. M. Woo
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Correspondence to E. M. Woo.

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Chang, L.L., Woo, E.M. UCST behavior in blend systems of isotactic polystyrene/poly(4-methyl styrene) in comparison with atactic polystyrene/poly(4-methyl styrene). Colloid Polym Sci 281, 1149–1156 (2003). https://doi.org/10.1007/s00396-003-0890-5

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  • DOI: https://doi.org/10.1007/s00396-003-0890-5

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