Rheol Acta 46:153–159īerry GC, Fox TG (1968) The viscosity of polymers and their concentrated solutions. Park HE, Dealy JM, Münstedt H (2006) Influence of long-chain branching on time-pressure and time-temperature shift factors for polystyrene and polyethylene. Park HE, Dealy JM (2006) Effect of pressure and supercritical CO2 on the viscosity of Polyethylene. Venkatraman S, Okano M, Nixon AA (1990) A comparison of torsional and capillary rheometry for polymer melts: the Cox-Merz rule revisited. Utracki LA, Gendron R (1984) Pressure oscillation during extrusion of polyethylenes. 82nd annual meeting, Santa Fe, NMĬox WP, Merz EH (1958) Correlation of dynamic and steady flow viscosities. Wang J (2010) Double cross model-A novel way to model viscosity curves, Society of Rheology. Plumley TA, Lai S, Betso SR, Knight GW (1994) Rheological modeling of Insite technology polymers. Rheol Acta 20:163–178Įlberli B, Shaw MT (1978) Time constants from shear viscosity data. Yasuda KY, Armstrong RC, Cohen RE (1981) Shear flow properties of concentrated solutions of linear and star-branched polystyrenes. Hieber CA, Chiang HH (1992) Shear-rate-dependence modeling of polymer melt viscosity. J Coll Sci 20:417–437Ĭarreau PJ (1972) Rheological equations from molecular network theories. J Colloid Interface Sci 22:517–530Ĭross MM (1965) Rheology of non-Newtonian fluids: a new flow equation for pseudoplastic systems. Stratton RA (1966) The dependence of non-Newtonian viscosity on molecular weight for “Monodisperse” polystyrene. Meissner J (1971) Deformationsverhalten der Kunststoffe im flüssigen und im festen Zustand. This process is experimental and the keywords may be updated as the learning algorithm improves.īird RB, Armstrong RC, Hassager O (1987) Dynamics of Polymeric Liquids, vol 1. These keywords were added by machine and not by the authors. This chapter describes the dependence of viscosity on shear rate, temperature, molecular weight and its distribution, tacticity, comonomer content, and long-chain branching. Flow in an extruder is dominated by the viscometric functions, mainly the viscosity. In addition to simple shear, other viscometric flows include flow in straight channels and rotational flows between concentric cylinders, between a cone and plate and between two disks. The viscosity and the two normal stress differences are functions of shear rate that are called the viscometric functions, and flows governed by these are called viscometric flow s. For viscoelastic fluids, two other quantities are needed for a complete description of the stress field, and these are the first and second normal stress differences. It relates the shear stress to the shear rate in steady simple shear flow, which is the deformation generated between two parallel plates, one of which undergoes linear displacement. Viscosity is the property most used with molten plastics.
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