Abstract: The molecular weight and molecular weight distribution, branch degree, basic properties and rheological behavior of homemade and imported metallocene linear low density polyethylene resin(mLLDPE) were investigated contrastively. Results were found that homemade mLLDPE has broader molecular weight distribution and higher branch degree, so is easier to process compared with imported mLLDPE. The structure of mLLDPE can be analyzed through several rheological parameters, such as flow activation energy, shear thining index, relaxation spectrum index. In addition, their film properties were measured. Result was that film produced by homemade mLLDPE resin have better mechanical properties and worse appearance due to more fisheyes.

Key words: metallocene linear low-density polyethylene, rheological behavior, molecular weight, structure, molecular weight distribution, branched degree