Gradus

Vol 4, No 2 (2017): Autumn (November)

 

DETERMINATION OF POLYMER MELTS FLOW-ACTIVATION ENERGY


Gergely Toth , Attila Bata and Karoly Belina

Abstract

In this paper a method is shown to calculate the activation energy of flow of high density polyethylene (HDPE), polystyrene (PS) and polycarbonate (PC). The importance of polymer melt flow properties during processing has required continuous research of polymer melt rheology. In the previous article [1] we described how to measure polycarbonate shear viscosity between 100 to 105 s-1 shear-rate region with standard and non-standard equipment This article represent that shear viscosity and activation energy of flow of the polymers depend on the chemical structure. It was found that more rigid molecular structure results higher values.


Keywords

Keywords: rheology, activation energy, polycarbonate, polyethylene, polystyrene,


References

[1] G Toth, A Bata, K Belina: Polycarbonate melt shear viscosity in wide range shear rate IOP CONFERENCESERIES: MATERIALS SCIENCE AND ENGINEERING 175:(Conference 1) Paper 012056.
[2] Arrhenius, S.A., Recherches sur la conductibilitée galvanique des électrolytes, 1884; Über die innere Reibungverdünnter wässriger Lösungen, Z. Physik. Chem.1, 1887; Lärobok i teoretisk elektrokemi, 1900; Viskosität undHydratation kolloidaler Lösungen, Medd. K. Vet. Akad. Nobelinst., 1915; Kemien och det moderna livet, 1919
[3] Meichsner, G., Mezger, T., Schröder, J., Lackeigenschaften messen und steuern, Vincentz, Hannover, 2003
[4] Malcolm M. Cross: Rheology of non-Newtonian fluids: A new flow equation for pseudoplastic systems, Journal ofColloid Science Volume 20, Issue 5, June 1965, Pages 417-437
[5] JZ. Liang, C.Y. Tang: Studies of Melt Flow Properties During Capillary Extrusion of Polycarbonate, Journal ofMaterials Processing Technology 63 (1997) 501-504
[6] F.N.Cogswell: Polymer Melt Rheology, London 1981.
[7] Kovács József Gábor: Modelling and measurement of material properties for injection moulding simulations,Anyagvizsgálók lapja, Elektronikus folyóirat, 2010/1-2
[8] Gergely Tóth, Attila Bata, Zsolt Dugár, Tamás Dugár, Szabó Tamás: Polymer melt viscosity measuring by aninjection machine, GRADUS 2:(2) pp. 112-117. 2015
[9] Dr. Mózes Gyula – Dr. Vámos Endre: Reológia és Reometria, Műszaki könyvkiadó, Budapest, 1968.
[10] Haddout and G. Villoutreix: Polymer Melt Rheology at High Shear Rates. International Polymer Processing: Vol. 15,No. 3, pp. 291-296. 2000.



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