화학공학소재연구정보센터
Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.5, 761-766, August, 1999
이성분 폴리에틸렌/부탄과 폴리에틸렌/디메틸 에테르계의 고압 상거동
High Pressure Phase Behavior in the Binary Polyethylene/Butane and Polyethylene/Dimethyl Ether Systems
초록
본 연구는 고압하에서 폴리에틸렌(Mw=700, 1000 및 2000)/부탄(butane)과 폴리에틸렌(Mw=700, 1000 및 2000)/디메틸 에테르(dimethyl ether)계에 대한 상거동 실험을 수행하였다. 폴리에틸렌/부탄계는 Mw=700, 1000 및 2000의 각 중량분자량에 대해 농도를 증가시키면서 압력-온도관계를 나타내었다. 각 중량분자량의 농도가 증가함에 따라 온도와 압력이 증가하다 농도가 약 16 wt% 이상에서 압력이 감소함을 보였다. 또한 각 분자량에 대해 폴리에틸렌의 양을 약 5 wt% 첨가하여 상거동을 압력-온도관계로 나타내었으며, Mw=700, 1000 및 2000으로 분자량이 증가함에 따라 압력이 증가함을 보였다. 폴리에틸렌/디메틸 에테르계는 각각의 분자량에 따라 상거동을 나타내었으며, 온도 약 120∼220℃ 범위에서 압력 40∼290 bar 범위로 나타났다. 폴리에틸렌/디메틸 에테르계의 압력-온도관계는 폴리에틸렌의 분자량이 증가함에 따라 온도와 압력도 증가하였으며, 각 분자량에 따른 압력차는 60 bar 정도로 나타났다. 또한 각 분자량에 따라 약 5wt% 일정량의 폴리에틸렌에 대한 폴리에틸렌/부탄과 폴리에틸렌/디메틸에테르계를 비교한 결과 압력차는 약 25(Mw=700), 약 90(Mw=1000) 및 약 100 bar(Mw=2000)의 간격으로 나타났다.
In this paper, high pressure phase behavior in the binary polyethylene/butane and polyethylene/dimethyl ether has been studied. The pressure-temperature diagrams in polyethylene/butane were shown by increasing concentration for molecular weight standards, that is, Mw=700, 1000 and 2000. It is found that the temperature and the pressures go up with increasing in concentrations for each molecular weight, but the latter lower in concentrations over 16 wt% polyethylene. In addition, the phase behaviors for each molecular weights with about 5 wt% polyethylene are shown in pressure-temperature, and pressures increase with increasing in molecular weight(Mw=700, 1000, and 2000). The phase behaviors in polyethylene/dimethyl ether are determined according to its molecular weight, and are shown for a range of pressures of 40∼280 bar and temperatures of about 120∼220℃. It is shown that in pressure-temperature of polyethylene/dimethyl ether the pressure increases with increasing in polyethylene molecular weight, and the difference in pressure for each molecular weight shows by about 60 bar. The gap in pressure between polyethylene/butane and polyethylene/dimethyl ether system with 5 wt% polyethylene for each molecular weight standards indicates about 25(700), 90(1000), and 100 bar(2000), respectively.
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