Rheometry SLIT RHEOMETER

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<strong>Rheometry</strong> MELT-FLOW INDEX MF I = ρQ at constant stress If Newtonian, know µ = Polymers are non-Newtonian π∆P R4 8QL µ ∼ 1 MF I Figure 14: Viscosity versus shear rate for a nearly monodisperse polystyrene at several temperatures.
<strong>Rheometry</strong> MELT-FLOW INDEX Can a single point measurement characterize η( ˙γ) Figure 15: Viscosity versus shear rate for a nearly monodisperse polystyrene at several temperatures. Two polymers have the same melt flow index, but very different flow properties. MF I is only useful for quality control if the molecular weight distributions of the materials are all similar. MF I is useless for process modeling. MF I is the single most widely used quality control measure in the plastics industry.
Page 1 and 2: Rheometry SLIT RHEOMETER Figure 1:
Page 3 and 4: Rheometry SLIT RHEOMETER NORMAL STR
Page 5 and 6: Rheometry SLIT RHEOMETER ENTRANCE P
Page 7 and 8: Rheometry SLIT AND CAPILLARY RHEOME
Page 13: Rheometry MELT FLOW INDEX “RHEOME

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