Morphological Properties of Binary Blends of Polyolefins Synthesized by Metallocene and Ziegler-Natta Catalysts

Ziegler-Natta와 메탈로센 촉매로 합성된 폴리올레핀 2원 블렌드의 상 형태학

  • Kwag, Hanjin (Department of Chemical Engineering, Research Institute of Polymer Science and Engineering, Inha University) ;
  • Kim, Hak Lim (Department of Chemical Engineering, Research Institute of Polymer Science and Engineering, Inha University) ;
  • Choe, Soonja (Department of Chemical Engineering, Research Institute of Polymer Science and Engineering, Inha University)
  • 곽한진 (인하대학교 화학공학과) ;
  • 김학림 (인하대학교 화학공학과) ;
  • 최순자 (인하대학교 화학공학과)
  • Received : 1999.08.06
  • Accepted : 1999.09.13
  • Published : 1999.10.10

Abstract

The morphological properties of four binary blends of polyethylene synthesized by metallocene catalyst(MCPE) and four polyolefins prepared by Ziegler-Natta catalyst have been investigated to interpret the effect of micro-molecular structure on the phase morphology and interfacial behavior; four binary blend systems studied are high density polyethylene(HDPE)-metallocene polyethylene (MCPE), polypropylene(PP)-MCPE, poly(propylene-co-ethylene) (CoPP)-MCPE, and poly(propylene-co-ethylene-co-1-butylene) (TerPP)-MCPE, and they are all phase separated. The HDPE-MCPE blend shows evenly growing homogeneous HDPE domain on the continuous MCPE phase, on the other hand, the rest of three blends show complex heterogeneous phase behavior. The PP-MCPE blend shows that PP and MCPE and completely phase separated and phase inversion takes place at 50% MCPE. The CoPP-MCPE and TerPP-MCPE show enhanced interface due to the same micro-molecular structure of ethylene, and phase inversion takes place at 40% MCPE. In particular, TerPP-MCPE blend shows improved phase morphology between interfaces, and this may be arisen from the comonomer contents in TerPP, which are 1-butene and ethylene having the same chemical structure as that of MCPE. The enhancement of the phase morphology in the TerPP-MCPE blend is correlated with the mechanical and morphological properties. Thus, although the four blend systems are phase separated, the phase morphology suggests that the order of interfacial adhesion strength be HDPE-MCPE > TerPP-MCPE > CoPP-MCPE > PP-MCPE and that micro-molecular structure between constituents be one of major factors giving enhanced interfacial adhesion.

Keywords

metallocene polyethylene(MCPE);phase morphology;miscible;interfacial adhesion

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