초임계 용매인 펜탄(n-pentane-h₁₂과 n-pentane-d₁₂을 포함한 poly(ethylene-co-20.2 mol% butene) 공중합체와의 상거동과 혼합물 밀도 측정을 하였다. 실험장치는 linear variable differential transducer(LVDT)을 갖춘 고압 가변 부피셀을 이용한 정지형이다. 순성분 노말-펜탄-h₁₂과 노말-펜탄-d₁₂(n-pentane-d₁₂에 대해 온도 30-150 ℃와 압력 71-2,415 bar 사이에서 밀도자료를 얻었으며, 노말-펜탄-h₁₂의 밀도는 0.503-0.750 g/cc 범위이고 노말-펜탄-d₁₂는 0.588-0.896 g/cc 범위였다. 또한 5.3 wt% poly(ethylene-co-20.2 mol% butene) 노말-펜탄-h₁₂계는 110, 130 및 150 ℃에서 압력 10-80 bar 사이에서 단일액상과 액액공존영역 사이의 상경계를 얻었으며, 온도가 감소함에 따라 단일액상[L]과 액-액 공존영역[LL] 사이의 상전이 평형압력이 감소하였다. 혼합물 밀도는 동일 온도에서 압력 45-2,415 bar 사이에서 얻었다. 5.1 wt% poly(ethylene-co-20.2 mol% butene)와 노말-펜탄-d₁₂ 혼합물은 110, 130 및 150 ℃에서 단일액상과 액-액 공존영역 사이의 상전이 평형압력이 105 bar 이하에서 용해되었으며, 혼합물 밀도는 동일온도에서 약 2,415 bar까지 실험하여 자료를 얻었다. 두 계의 혼합물 밀도는 비교적 완만한 곡선을 나타내었으며, 온도가 증가함에 따라 감소함을 알 수 있었다.

The phase behavior and mixture densities were obtained for binary mixtures of poly(ethylene-co-20.2mole% butene) copolymer with supercritical n-pentane(n-pentane-h₁₂ and n-pentane-d₁₂). The static type experimental apparatus with a high pressure variable volume cell & linear variable differential transducer(LVDT) was used. The density data were obtained for pure n-pentane-h₁₂ and n-pentane-d₁₂ at the temperature range from 30 to 150 ℃ and the pressure range from 71 to 2415 bar. The pure densities were at the range from 0.530 to 0.750 g/cc and at the range from 0.588 to 0.896 g/cc for n-pentane-h₁₂ and n-pentane-d₁₂, respectively. And also, the phase boundary between single phase/liquid-liquid coexistence region were obtained for 5.3 wt% poly(ethlyene-co-20.2 mol% butene)-n-pentane-h₁₂ system in the pressure range from 10 to 80 bar at 110, 130 and 150 ℃ so thus the equilibrium pressure of phase transition between single phase[L]/liquid-liquid[LL] coexistence region decreased as the temperature decreased. Also, the mixture densities were obtained in the pressure range from 45 to 2415 bar at the same temperatures. The phase transition data between single phase/liquid-liquid coexistence region were obtained for 5.1 wt% poly(ehylene-co-20.2 mol% butene)-n-pentane-d₁₂ mixture in the pressure of below 105 bar at the temperature of 110,130 and 150 ℃. Also the mixture densities were obtained in the pressure up to 2415 bar at the same temperatures. The mixture densities of two systems showed sluggish curve and decreased as the temperature increased.

Supercritical Pentane Phase Behavior Density Copolymer

Chen AQ, Radosz M, J. Chem. Eng. Data, 44, 854 (1999) 
Pan C, Radosz M, Ind. Eng. Chem. Res., 38(7), 2842 (1999) 
Asseal MJ, Dymond JH, Exadaktilou D, Int. J. Thermophys., 15, 155 (1994) 
Xiong Y, Kiran E, Polymer, 36(25), 4817 (1995)
Conway SE, Byun HS, McHugh MA, Wang JD, Mandel FS, J. Polym. Sci. B: Polym. Phys., 2000 accepted
DiNoia TP, Kirby CF, Zanten JH, McHugh MA, Macromolecules, 2000 to be submitted
Byun HS, Hasch BM, Mchugh MA, Mahling FO, Busch M, Buback M, Macromolecules, 29(5), 1625 (1996) 
Byun HS, Jeon NS, Fluid Phase Equilib., 167(1), 113 (2000) 
Bridgman PW, Proc. Am. Acad. Arts Sci., 66, 185 (1931)
Gehrig M, Lentz H, J. Chem. Thermodyn., 11, 291 (1979) 
Easteal AJ, Woolf LA, Int. J. Thermophys., 8, 231 (1987) 
Fenby DV, Kooner ZS, Khurma JR, Fluid Phase Equilib., 7, 327 (1981) 
Rabinovich IB, Russ. Chem. Rev., 31, 51 (1962) 
Wade D, Chemico-Biological Int., 117, 191 (1999)