Elastomers and Composites

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Phase Behavior of Ternary Mixture of Poly(ethylene-co-octene) - Ethylene - 1-Octene

Poly(ethylene-co-octene) - Ethylene - 1-Octene 3성분계 혼합물의 상거동

  • Lee, Sang-Ho (Department of Chemical Engineering, Dong-A University) ;
  • Sohn, Jin-Eun (Department of Chemical Engineering, Dong-A University) ;
  • Chung, Sung-Yoon (Department of Chemical Engineering, Dong-A University) ;
  • Han, Sang-Hoon (Department of Chemical Engineering, Dong-A University)
  • Published : 2006.06.30
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Abstract

Cloud-point data to $160^{\circ}C$ and 1,000 bar are presented with poly(ethylene-co-15.3 mole% octene) copolymers ($PEO_{15}$) in pure 1-octene and mixtures of ethylene - 1-octene. The cloud-point curves for $PEO_{15}$ - ethylene - 1-octene mixture dramatically increase in pressure to as high as 1,000 bar with an increasing ethylene concentration. At ethylene concentrations less than 18 wt%, the ternary mixture has bubble- and cloud-point curves. As the ethylene concentration of the ternary mixture increases, the bubble-point curve and the single-phase region reduce. The reduction in the single phase region with increasing ethylene concentrations is the result of reduced dispersion interactions between $PEO_{15}$ and the mixed solvent. The single-phase region decreases with increasing temperatures when ethylene concentrations are lower than 36 wt%, whereas the single-phase region increases with temperatures at ethylene concentrations greater than 50 wt%. At ethylene concentrations greater than 50 wt% the effect of the polar interactions of the mixed solvent, which is unfavorable to dissolve PEO, is greater than the effect of the density of the mixed solvent. Therefore, the cloud-point pressures increase with a decreasing temperature. However, at ethylene concentrations less than 50 wt%, the cloud-point pressures decrease with temperature, because the effect of the polar interactions is less than the density effect.

Poly(ethylene-co-15.3 mole% octene) ($PEO_{15}$) - 1-옥텐 2성분계 혼합물과 $PEO_{15}$와 (에틸렌 + 1-옥텐) 혼합용매로 이루어진 3성분계 혼합물의 상거동을 $160^{\circ}C$와 1,000 bar의 영역까지 측정하였다. $PEO_{15}$ - 에틸렌 - 1-옥텐 혼합물에서 에틸렌의 함량이 증가함에 따라 cloud-point 곡선이 측정되는 압력이 급격하게 높아졌다. 에틸렌 함량이 18 wt% 보다 낮을 경우, $PEO_{15}$ -에틸렌 - 1-옥텐 혼합물에서 bubble-point 곡선과 cloud-point 곡선이 모두 관측되었다. 에틸렌 함량이 증가함에 따라 $PEO_{15}$ - 에틸렌 - 1-옥텐 혼합물에서 bubble-point 곡선이 관측되는 온도범위는 좁아졌으며, $PEO_{15}$ - 에틸렌 - 1-옥텐 혼합물이 단일상으로 존재하는 온도-압력 영역이 현저히 감소하였다. 에틸렌 함량에 따라 단일상 영역이 감소하는 것은 $PEO_{15}$와 (에틸렌 + 1-옥텐) 혼합용매 사이에 작용하는 분산인력이 줄어들기 때문이다. 에틸렌을 36 wt% 보다 적게 함유한 $PEO_{15}$ - 에틸렌 - 1-옥텐 혼합물의 단일상 영역은 온도가 높아짐에 따라 감소하였다. 이와는 대조적으로 에틸렌을 50 wt% 보다 많게 함유한 $PEO_{15}$ - 에틸렌 - 1-옥텐 혼합물의 단일상 영역은 온도가 녹아짐에 따라 증가하였다. $PEO_{15}$ 용해도를 낮추는 혼합용매 사이의 극성인력과 $PEO_{15}$ 용해도를 높이는 혼합용매의 밀도는 온도가 낮아짐에 따라 증가한다. 에틸렌 함량이 50 wt% 보다 많을 경우, 혼합용매들의 극성인력 효과가 밀도 효과보다 커서 온도가 낮아짐에 따라 cloud-point 압력은 증가하였다. 에틸렌 함량이 50 wt% 보다 적을 경우, 혼합용매들의 극성인력 효과가 밀도 효과보다 작아서 온도가 낮아짐에 따라 cloud-point 압력은 감소하였다.

Keywords

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