Effect of Polymer Backbone Architecture on the Phase Behavior of Poly(ethylene-co-octene) + cyclo-Hydrocarbon Mixtures

Poly(ethylene-co-octene) /고리형탄화수소 2성분계 혼합물의 상거동에 대한 고분자 사슬구조의 영향

  • Lee, Sang-Ho (Department of Chemical Engineering, Dong-A University) ;
  • Chuug, Sung-Yun (Department of Chemical Engineering, Dong-A University) ;
  • Sohn, Jin-Eun (Department of Chemical Engineering, Dong-A University)
  • 이상호 (동아대학교 화학공학과) ;
  • 손진언 (동아대학교 화학공학과) ;
  • 정성윤 (동아대학교 화학공학과)
  • Published : 2005.12.31

Abstract

LV transition curves for poly(ethylene-co-15.3 mol% octene) ($PEO_{15}$) and poly(ethylene- co-17.0 mol% octene) ($PEO_{17}$) were measured in cyclo-pentane and cyclo-hexane. Between $40{\sim}150^{\circ}C$, the LV curve for ($PEO_{15}$ + cyclo pentane) located $1.1{\sim}2.7$ bar higher than that for ($PEO_{17}$+ cyclo-pentane). In cyclo-hexane, similar behavior was observed for $PEO_{15}$ and $PEO_{17}$ solution except the pressure difference reduced to $0.9{\sim}l.6$ bar. If the backbone structure of $PEO_{15}$ were identical to that of $PEO_{17}$, the LV line for $PEO_{17}$ would locate at high pressures than that for $PEO_{15}$, since the number average molecular weight of $PEO_{17}$ (Ave. Mn=153,040) is 1.9 times higher 4han that of $PEO_{15}$ (Ave. Mn=82,200). The difference in the octene comonomer content between $PEO_{15}$ and $PEO_{17}$ is only 1.7 mole%, nevertheless this small difference in the backbone structure of the PEO greatly affected the location of the L-V curves in the mixtures comprised of PEO and cyclo-alkane.

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