Effect of Hydrostatic Pressure on Closed-Loop Phase Behavior of Block Copolymers

Du Yeol Ryu, Dong Jun Lee, Jin Kon Kim, Kristopher A. Lavery, Thomas P. Russell, Young Soo Han, Baek Seok Seong, Chang Hee Lee, P. Thiyagarajan

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Abstract

The effect of hydrostatic pressure ([Formula presented]) on closed-loop phase behavior of deuterated polystyrene-block-poly([Formula presented]-pentyl methacrylate) copolymers [dPS-PnPMA] was investigated by using small-angle neutron scattering and birefringence. For [Formula presented], dPS-PnPMA exhibited a lower disorder-to-order transition temperature ([Formula presented]) at [Formula presented], and then an upper order-to-disorder transition temperature ([Formula presented]) at [Formula presented]. With increasing pressure both [Formula presented] and [Formula presented] were markedly changed, where [Formula presented] was [Formula presented] and [Formula presented] was [Formula presented]. These are consistent with predictions by the Clausius-Clapeyron equation using measured values of the volume and enthalpy changes of both transitions. The large pressure coefficients imply that the closed-loop phase behavior observed for PS-PnPMA is an entropic-driven phase transition.

Original languageEnglish
Pages (from-to)4
Number of pages1
JournalPhysical review letters
Volume90
Issue number23
DOIs
Publication statusPublished - 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Ryu, D. Y., Lee, D. J., Kim, J. K., Lavery, K. A., Russell, T. P., Han, Y. S., Seong, B. S., Lee, C. H., & Thiyagarajan, P. (2003). Effect of Hydrostatic Pressure on Closed-Loop Phase Behavior of Block Copolymers. Physical review letters, 90(23), 4. https://doi.org/10.1103/PhysRevLett.90.235501