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

doi:10.1103/PhysRevLett.90.235501

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

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article

4 Citations (Scopus)

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 language	English
Number of pages	1
Journal	Physical Review Letters
Volume	90
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.90.235501
Publication status	Published - 2003 Jan 1

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All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Cite this

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). https://doi.org/10.1103/PhysRevLett.90.235501

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title = "Effect of Hydrostatic Pressure on Closed-Loop Phase Behavior of Block Copolymers",

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.",

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

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AU - Ryu, Du Yeol

AU - Lee, Dong Jun

AU - Kim, Jin Kon

AU - Lavery, Kristopher A.

AU - Russell, Thomas P.

AU - Han, Young Soo

AU - Seong, Baek Seok

AU - Lee, Chang Hee

AU - Thiyagarajan, P.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - 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.

AB - 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.

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10.1103/PhysRevLett.90.235501