| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.493 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Effect of Backbone Architecture on the Phase Behavior of Poly(ethylene-co-octene) + Hydrocarbon Systems |
| 초록 | Introduction The variety of Poly(ethylene-co-octene) (PEO) properties is the consequence of incorporation octene comonomer in polyethylene backbone architecture. In this study, experimental data are presented on the phase behavior PEO + hydrocarbon binary mixtures. The effect of PEO backbone architecture on the solubility of the binary mixtures demonstrated with poly(ethylene-co-2.7 mol% octene), poly(ethylene-co-6.2 mol% octene), poly(ethylene-co-13 mol% octene) in supercritical and liquid hydrocarbon solvents. Cloud-point and bubble-point curves are obtained at temperatures from 50 to 160°C and pressures to 1,000 bar. Also, the effect of the PEO concentration on the phase behavior will be demonstrated in the hydrocarbons. Preliminary Results Figure 1 shows the effect of poly(ethylene-co-15 mol% octene) (PEO15) concentrations on the phase behavior of PEO15 + n-pentane mixture. As pressures reduce below each curve, the homogeneous liquid phase of the binary mixture separates to PEO15 rich liquid phase and n-pentane rich vapor phase. The single-phase region increases with decreasing temperature. The curves for PEO15 + n-pentane mixture have maximums between the copolymer concentrations of 2 to 12 wt%. Therefore we maintain polymer concentration at 5 wt% PEO to measure the phase behavior. Figure 2 shows the effect of the backbone architecture of PEO copolymer on the phase behavior of PEO + n-pentane. With increasing the octene comonomer in the backbone structure, temperature dissolving PEO increases at constant pressures. Around 90℃, PEO2.7 is solidified and PEO2.7 is not dissolved in n-pentane regardless of pressure. At temperatures lower than 105℃, PEO6.2 + n-pentane system exhibited bubble-point type transition. At temperatures greater than 105℃, the transition type of PEO6.2 + n-pentane system is switched to cloud-point transition. With PEO13, temperature that the transition type change from bubble-point to cloud-point type increases to around 120℃. At pressure lower than 10 bar, the single phase region increases from 90℃ to 125℃ as the octene content of the PEO increases from 2.7 to 13 mol%. The enhanced solubility is the consequence of the degree of branchiness of PEO increasing with octene content, which reduces the free volume difference between n-pentane and PEO. |
| 저자 | 정성윤1, 김효준2, 박경규1, 이상호2 |
| 소속 | 1Department of Chemical Engineering, 2Dong-A Univ. |
| 키워드 | phase behavior; n-Alkane; PEO; cloud-point; bubble-point |
