Comparative Study for Melt Flow Index of High Density Polyethylene, Low Density Polyethylene and Linear Low Density Polyethylene
Abstract
This study focus on the rheological behaviour of polyethylene polymer. 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 was used. 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 behaviour of polymers.
References
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[20] Li, K., & Matsuba, G. (2017). Effects of relaxation time and zero shear viscosity on structural evolution of linear low-density polyethylene in shear flow. Journal of Applied Polymer Science, 135(13), 1-9. doi: 10.1002/app.46053
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[2] Yousfi, M., Alix, S., Lebeau, M., Soulestin, J., Lacrampe, M.-F., & Krawczak, P. (2014). Evaluation of rheological properties of non-Newtonian fluids in micro rheology compounder: Experimental procedures for a reliable polymer melt viscosity measurement. Polymer Testing, 40, 207-217. doi: 10.1016/j.polymertesting.2014.09.010
[3] Ansari, M., Zisis, T., Hatzikiriakos, S. G., & Mitsoulis, E. (2012). Capillary flow of low-density polyethylene. Polymer Engineering & Science, 52(3), 649-662. doi: 10.1002/pen.22130
[4] Drozdov, A. D. (2010). Cyclic thermo-viscoplasticity of high density polyethylene. International Journal of Solids and Structures, 47(11-12), 1592-1602. doi: 10.1016/j.ijsolstr.2010.02.021
[5] Mnekbi, C., Vincent, M., & Agassant, J. F. (2010). Polymer rheology at high shear rate for microinjection moulding. International Journal of Material Forming, 3(S1), 539-542. doi: 10.1007/s12289-010-0826-9
[6] Musil, J., & Zatloukal, M. (2011). Experimental investigation of flow induced molecular weight fractionation during extrusion of HDPE polymer melts. Chemical Engineering Science, 66(20), 4814-4823. doi: 10.1016/j.ces.2011.06.047
[7] Peres, A. M., Pires, R. R., & Orefice, R. L. (2016). Evaluation of the effect of reprocessing on the structure and properties of low density polyethylene/thermoplastic starch blends. Carbohydr Polym, 136, 210-215. doi: 10.1016/j.carbpol.2015.09.047
[8] Djellali, S., Sadoun, T., Haddaoui, N., & Bergeret, A. (2015). Viscosity and viscoelasticity measurements of low density polyethylene/poly(lactic acid) blends. Polymer Bulletin, 72(5), 1177-1195. doi: 10.1007/s00289-015-1331-6
[9] Huang, Q., Mangnus, M., Alvarez, N. J., Koopmans, R., & Hassager, O. (2016). A new look at extensional rheology of low-density polyethylene. Rheologica Acta, 55(5), 343-350. doi: 10.1007/s00397-016-0921-z
[10] Khanoonkon, N., Yoksan, R., & Ogale, A. A. (2016). Effect of stearic acid-grafted starch compatibilizer on properties of linear low density polyethylene/thermoplastic starch blown film. Carbohydr Polym, 137, 165-173. doi: 10.1016/j.carbpol.2015.10.038
[11] Ansari, M., Derakhshandeh, M., Doufas, A. A., Tomkovic, T., & Hatzikiriakos, S. G. (2018). The role of microstructure on melt fracture of linear low density polyethylenes. Polymer Testing, 67, 266-274. doi: 10.1016/j.polymertesting.2018.03.015
[12] Chen, A.-F., Huang, H.-X., & Guan, W.-S. (2015). Comparison of superimposed effects in high-shear-rate capillary rheology of polystyrene, polypropylene, and linear low-density polyethylene melts. Polymer Engineering & Science, 55(3), 506-512. doi: 10.1002/pen.23915
[13] Wingstrand, S. L., van Drongelen, M., Mortensen, K., Graham, R. S., Huang, Q., & Hassager, O. (2017). Influence of Extensional Stress Overshoot on Crystallization of LDPE. Macromolecules, 50(3), 1134-1140. doi: 10.1021/acs.macromol.6b02543
[14] Vera-Sorroche, J., Kelly, A. L., Brown, E. C., Gough, T., Abeykoon, C., Coates, P. D., Price, M. (2014). The effect of melt viscosity on thermal efficiency for single screw extrusion of HDPE. Chemical Engineering Research and Design, 92(11), 2404-2412. doi: 10.1016/j.cherd.2013.12.025
[15] Burghelea, T. I., Starý, Z., & Münstedt, H. (2011). On the “viscosity overshoot” during the uniaxial extension of a low density polyethylene. Journal of Non-Newtonian Fluid Mechanics, 166(19-20), 1198-1209. doi: 10.1016/j.jnnfm.2011.07.007
[16] Ebrahimi, M., Tomkovic, T., Liu, G., Doufas, A. A., & Hatzikiriakos, S. G. (2018). Melt fracture of linear low-density polyethylenes: Die geometry and molecular weight characteristics. Physics of Fluids, 30(5), 1-11. doi: 10.1063/1.5029380
[17] Weon, J.-I. (2010). Effects of thermal ageing on mechanical and thermal behaviors of linear low density polyethylene pipe. Polymer Degradation and Stability, 95(1), 14-20. doi: 10.1016/j.polymdegradstab.2009.10.016
[18] Rasmussen, H. K., & Fasano, A. (2018). Flow and breakup in extension of low-density polyethylene. Rheologica Acta, 57(4), 317-325. doi: 10.1007/s00397-018-1081-0
[19] Ansari, M., Hatzikiriakos, S. G., & Mitsoulis, E. (2011). Slip effects in HDPE flows. Journal of Non-Newtonian Fluid Mechanics, 167, 18-29. doi: 10.1016/j.jnnfm.2011.09.007
[20] Li, K., & Matsuba, G. (2017). Effects of relaxation time and zero shear viscosity on structural evolution of linear low-density polyethylene in shear flow. Journal of Applied Polymer Science, 135(13), 1-9. doi: 10.1002/app.46053
[21] Zatloukal, M. (2016). Measurements and modeling of temperature-strain rate dependent uniaxial and planar extensional viscosities for branched LDPE polymer melt. Polymer, 104, 258-267. doi: 10.1016/j.polymer.2016.04.053
