SEARCH

SEARCH BY CITATION

Keywords:

  • COC;
  • ethene-norbornene copolymers;
  • metallocene catalysts;
  • olefin polymerization;
  • pentalene-zirconocene complexes

Abstract

To increase the thermal stability of metallocene-methylaluminoxane catalysts. pentalene bridged zirconocenes and a constrained geometry catalyst were used for the copolymerisation of ethene and norbornene. The constrained geometry catalyst is stable in solution up to 90°C. Surprisingly the molecular weight of the copolymers increases with higher incorporation rates of norbornene. Glass transition temperatures of 120°C are reached. The microstructure of the cyclic olefin copolymers material is more alternating.