화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.6, No.2, 107-114, March, 2000
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Melt Rheology of Binary Blends of Metallocene Polyethylene with Conventional Polyolefins
Hanjin Kwak, Dipak Rana1, and Soonja Choe†
  • Department of Chemical Engineering, Institute of Polymer Science and Engineering, Inha University, Inchon 402-751, Korea
  • 1Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
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The melt rheology of the binary blends of metallocene polyethylene (MCPE) (polyethylene synthesized by emtallocene catalyst) with conventional polyolefins prepared using the Ziegler-Natta catalyst was investigated. The blend pairs are MCPE with high density polyethylene (MCPE-HDPE), polypropylene (MCPE-PP), poly(propylene-co-ethylene) (MCPE-CoPP), and poly(propylene-co-ethylene-co-1-butylene) (MCPE-TerPP). The analysis was based on three methods. The first analyzed the shape and diameter of the semi-circular curves in the plots of the storage melt viscosity (η'') versus the loss melt viscosity (η'''') representing the Cole-Cole plot. The second was based on the slops in logarithmic plots of the dynamic storage modulus (G'') versus the dynamic loss moudulus (G'''') between the blend compositions and the pure components. The third analyzed the deviation of the plot of the log complex viscosity (log η*), logη'' and log η'''' versus the blend compositions from the linearity. As a consequence, the MCPE-HDPE blend showed semi-circular with the same diameter in the Cole-Cole plot, linearity in the slope of the log G'' versus log G'''' between the pure components and the blend compositions, and the rule of the mixtures between the melt viscosity and the blend compositions. In contrast, the other three blends showed a different manner. Accordingly, the MCPE-HDPE blend is miscible, however, the other blends are not, which may result from the similar chemical structure of the ethylene unit between the main and the side chain. This interpretation of the melt rheology agrees well with the morphology.
Keywords:metallocenc polyethylene (MCPE);polypropylene;poly(propylene-co-ethylene) (CoPP);poly(propylene-co-ethylene-co-1-butylene) (TerPP);melt rheology
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