Comparative Study for Melt Flow Index of Different Microstructure Polyethylene

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.

[1]  S. Hatzikiriakos,et al.  Melt fracture of linear low-density polyethylenes: Die geometry and molecular weight characteristics , 2018 .

[2]  S. Hatzikiriakos,et al.  The role of microstructure on melt fracture of linear low density polyethylenes , 2018 .

[3]  K. Li,et al.  Effects of relaxation time and zero shear viscosity on structural evolution of linear low‐density polyethylene in shear flow , 2018 .

[4]  A. Fasano,et al.  Flow and breakup in extension of low-density polyethylene , 2018, Rheologica Acta.

[5]  T. McLeish,et al.  Pressure and shear rate dependence of the viscosity and stress relaxation of polymer melts , 2018 .

[6]  S. L. Wingstrand,et al.  Influence of Extensional Stress Overshoot on Crystallization of LDPE , 2017 .

[7]  M. Zatloukal.  Measurements and modeling of temperature-strain rate dependent uniaxial and planar extensional viscosities for branched LDPE polymer melt , 2016 .

[8]  Qian Huang,et al.  A new look at extensional rheology of low-density polyethylene , 2016, Rheologica Acta.

[9]  A. Ogale,et al.  Effect of stearic acid-grafted starch compatibilizer on properties of linear low density polyethylene/thermoplastic starch blown film. , 2016, Carbohydrate polymers.

[10]  R. Oréfice,et al.  Evaluation of the effect of reprocessing on the structure and properties of low density polyethylene/thermoplastic starch blends. , 2016, Carbohydrate polymers.

[11]  Wei-Sheng Guan,et al.  Comparison of superimposed effects in high-shear-rate capillary rheology of polystyrene, polypropylene, and linear low-density polyethylene melts , 2015 .

[12]  Tahar Sadoun,et al.  Viscosity and viscoelasticity measurements of low density polyethylene/poly(lactic acid) blends , 2015, Polymer Bulletin.

[13]  J. Soulestin,et al.  Evaluation of rheological properties of non-Newtonian fluids in micro rheology compounder: Experimental procedures for a reliable polymer melt viscosity measurement , 2014 .

[14]  Kang Li,et al.  The effect of melt viscosity on thermal efficiency for single screw extrusion of HDPE , 2014 .

[15]  M. Zatloukal,et al.  Experimental investigation of flow induced molecular weight fractionation during extrusion of HDPE polymer melts , 2011 .

[16]  E. Mitsoulis,et al.  Slip effects in HDPE flows , 2011 .

[17]  T. Burghelea,et al.  On the viscosity overshoot during the uniaxial extension of a low density polyethylene , 2011 .

[18]  J. Agassant,et al.  Polymer rheology at high shear rate for microinjection moulding , 2010 .

[19]  Jong-Il Weon,et al.  Effects of thermal ageing on mechanical and thermal behaviors of linear low density polyethylene pipe , 2010 .