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 | |
| Publication status | Published - 2003 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Effect of Hydrostatic Pressure on Closed-Loop Phase Behavior of Block Copolymers. / Ryu, Du Yeol; Lee, Dong Jun; Kim, Jin Kon; Lavery, Kristopher A.; Russell, Thomas P.; Han, Young Soo; Seong, Baek Seok; Lee, Chang Hee; Thiyagarajan, P.
In: Physical Review Letters, Vol. 90, No. 23, 01.01.2003.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effect of Hydrostatic Pressure on Closed-Loop Phase Behavior of Block Copolymers
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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U2 - 10.1103/PhysRevLett.90.235501
DO - 10.1103/PhysRevLett.90.235501
M3 - Article
VL - 90
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 23
ER -