Abstract: Four kinds of metallocene linear low density polyethylene (PE-mLLD) and a regular linear low density polyethylene (PE-LLD) by Dushanzi Petrochemical Co. were studied, with their basic physical index, thermodynamic properties, cohesion state structure, relative molecular mass and its distribution, molecular chain structure and rheological properties being analyzed. Three PE-mLLD samples were copolymerized with hexane, which could be categorized as narrow and wide distributed ones. The former had a poor processability but better mechanical properties than PE-LLD; and the latter contained many branches so could be easily processed. The sample from DOW was copolymerized with octane, its molecular weight distribution was wide, both processing and mechanical properties were good.

Key words: metallocene linear low density polyethylene, molecular weight, copolymer monomer