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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 28, 2004
Accepted June 24, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Thermodynamic Phase Behavior of Fluoropolymer Mixtures with Supercritical Fluid Solvents

Hun-Soo Byun^† Young-Ho Yoo

Department of Chemical Engineering, Yosu National University, Yosu, Chonnam 550-749, Korea

Korean Journal of Chemical Engineering, November 2004, 21(6), 1193-1198(6), 10.1007/BF02719493

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Abstract

Cloud-point experimental data were presented at temperatures up to 260 ℃ and pressures up to 2,500 bar for poly(vinylidene fluoride) (PVDF) [M_w=180,000 and 275,000] in CO₂, CHF₃, CHClF₂, and dimethyl ether (DME). Also, phase behavior curves were shown for the PVDF [M_w=180,000] in CO₂ with 1-propanol and 1-pentanol. Poly(vinyl fluoride) does not dissolve in CO₂ even at 215 ℃ and 2,500 bar, while poly(vinylidene fluoride) does dissolve in CO₂ at 220 ℃ and pressures of 1,700 bar. To dissolve poly(vinylidene fluoride) in dimethyl ether, pressures in excess of 200 bar and temperatures in excess of 165 ℃ are needed. The cloud-point behavior between the ternary PVDF [M_w=180,000]-CO₂-DME mixture shows a temperature range of 100-195 ℃ and pressure range of 350-1,360 bar by adding the 11, 29, and 60 wt% DME in cosolvent. The phase behavior for PVDF [M_w=180,000]-CHF₃-9, 19, and 40 wt% CHClF₂ system shows a temperature at below 200 ℃ and pressure up to 1,700 bar. The effect of CHClF₂ as a cosolvent for PVDF [M_w=275,000] in CO₂ decreased with the pressure increasing 10, 26, 40 and 61 wt% of cosolvent (CHClF₂) contents. Also, the effect of 15 and 40 wt% DME for the PVDF [M_w=275,000]-CHF₃ mixture shows temperature ranges of 120-206 ℃ and pressures up to 1,570 bar.

Keywords

Phase Behavior Poly(vinylidene fluoride) Supercritical Fluid Solvents 1-Alcohol Fluoropolymer

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