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신현순 , 배 원 , 김화용 * 서울대학교 응용화학부 열물성연구실

2004 춘계 화공학회. High Pressure Phase Behavior of CO 2 + Heptadecafluorodecyl (meth)acrylate + poly[Heptadecafluorodecyl (meth)acrylate]. 신현순 , 배 원 , 김화용 * 서울대학교 응용화학부 열물성연구실. SCF monomer (initiator). SCF monomer Polymer. Introduction.

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신현순 , 배 원 , 김화용 * 서울대학교 응용화학부 열물성연구실

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  1. 2004 춘계 화공학회 High Pressure Phase Behavior ofCO2 + Heptadecafluorodecyl (meth)acrylate + poly[Heptadecafluorodecyl (meth)acrylate] 신현순, 배 원, 김화용* 서울대학교 응용화학부 열물성연구실

  2. SCF monomer (initiator) SCF monomer Polymer Introduction For homogeneous radical polymerization in scCO2, fluoro monomer must be dissolved in CO2. Initial State Final State Homogeneous Polymerization Therefore understanding and predicting the phase behavior of perfluoromonomer + polymer + CO2systems are important.

  3. SCF monomer (initiator) SCF monomer Polymer Introduction Recently, supercritical fluid is considered as useful alternative of toxic or volatile organic solvents for polymer synthesis and processing. scCO2 is a good solvent for amorphous fluoropolymers. For homogeneous radical polymerization in scCO2, fluoro monomer must be dissolved in CO2. Initial State Final State Homogeneous Polymerization

  4. Introduction For precipitation polymerization inscCO2, molecular weight and conversion are determined according to phase behavior of system. Initial State Final State SCF monomer (initiator) SCF monomer Precipitation Polymerization Polymer Therefore understanding and predicting the phase behavior of perfluoromonomer + CO2systems are important.

  5. Dispersant in scCO2 Additive for Latex Application of poly(fluoro acrylate) Porous surface protection Fiber optics cable Self dispersed polymers Polyfluoro acrylate Photoresist

  6. 1. Camera 2. Light source 3. Borescope 4. Thermocouple 5. View cell 6. Magnetic stirrer 7. Air bath 8. Digital thermometer 9. Digital pressure transducer 10. Pressure gauge 11. Hand pump 12. Computer monitor 13. Trap Experimental Apparatus Figure 1. Schematic Diagram of the experimental apparatus

  7. Materials AIBN, 343.15K, 30MPa 24hrs in scCO2 HDFDA [27905-45-9] HDFDMA [1996-88-9] Poly(HDFDA) Poly(HDFDMA) From Aldrich

  8. HDFD(M)A + CO2 system CO2-HDFDMA system CO2-HDFDA system Fluid Fluid L +V L + V

  9. Poly(HDFD(M)A) + CO2 system Fluid L + L

  10. at P1 LCST critical locus LCST T wt% polymer P1 pressure at P2 P2 T wt% polymer temperature wt% polymer Phase Diagram of polymer + solvent system

  11. Conclusion • The phase behaviors of solutions of poly[heptadecafluorodecyl (meth)acrylate] in scCO2 were studied experimentally using a high pressure variable volume view cell at temperature from 300 to 380K and pressure up to 30MPa. • Typical LCST phase behavior and liquid-liquid-vapor transition at high monomer concentration were observed.

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