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Comparative Study for Melt Flow Index of Different Microstructure Polyethylene

Author(s)
Raza Muhammad Khan Polymer and Petrochemical Engineering Department, NED University of Engineering & Technology,Karachi, Sindh,Pakistan
Asim Mushtaq Polymer and Petrochemical Engineering Department, NED University of Engineering & Technology,Karachi, Sindh,Pakistan
Amina Israr Polymer and Petrochemical Engineering Department, NED University of Engineering & Technology,Karachi, Sindh,Pakistan
Asra Nafees Polymer and Petrochemical Engineering Department, NED University of Engineering & Technology,Karachi, Sindh,Pakistan
Abstract
This study focus on the rheological behavior of polyethylene. The effect of molecular weight for three different types of polyethylene were study; high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and low density polyethylene (LDPE). To find the rheological behaviour of the polymer, melt flow indexer and capillary rheometer were used in this study. The shear stress and shear viscosity obtained from these three different polyethylene polymers were compared with the shear rate. It was observed that with the increase in shear rate, shear stress also increases. The behaviour of viscosity for HDPE, LLDPE and LDPE also discussed at the varying amount of shear rate. It was also found that viscosity of HDPE, LLDPE and LDPE decreases with increasing shear rate. The value of log shear stress of HDPE increases with an increase in log shear rate. The value of extension viscosity decreases from 8.295 to 1.606 KPa.s with a very high increase in extension rate of 23.5 s-1 to 721 s-1. Molecular mass and its distribution have a significant effect on the rheological behavior of polymers.
Publication Details
Page(s) 18-25
DOI 10.1122/1.5012969
Published Journal: Pakistan Journal of Engineering and Applied Sciences, Volume: 25, Issue: 0, Year: 2019

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Keywords
polyethylene, Melt flow index, Shear Stress, Extension Rate, Shear Viscosity
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