Rheological Insights into Examining the Molecular Weight Distribution ofPolyethylene: Distinguishing Between Unimodal and Bimodal Distribution

The rheological behavior of three types of polyethylenes (PE) with different molecular weightdistribution (MWD) was investigated using static and dynamic shear flow fields to distinguishbetween unimodal and bimodal distributions. The relaxation time spectrum and MWD of PEresins were determined by viscoelastic properties obtained from oscillation test. Our findings indicatethat HDPE۳ exhibits a broad unimodal MWD, whereas HDPE۱ and HDPE۲ display bimodal MWD.Additionally, HDPE۱ shows a higher molecular weight in the very high MW region compared toHDPE۲. These insights into the molecular structure and MWD of polyethylene can inform thedevelopment of PE materials with optimized processability and mechanical properties.

کلیدواژه ها:

Polyethylene ، Molecular structure ، Molecular Weight Distribution ، Shear Flow