1 Viscosity of polymers B&R Ch. 14. 2 3 Shear thinning.

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Presentation transcript:

1 Viscosity of polymers B&R Ch. 14

2

3 Shear thinning

Zero-shear viscosity To what temperature must you raise your system if you are to reduce the viscosity of a polymer to 10% of its 100 o C zero- shear viscosity? The activation energy is E=11.40 kcal/mol and R=1.987 cal/molK 4

Zero-shear viscosity In order to cut the zero-shear viscosity of a commercial polymer in half, what percent shorter do the polymer chains have to be? 5

Poiseuille flow 6

7 Processing additives B&R Ch. 18.4, 18.6 Reinforcing Agents Fillers Coupling agents Stabilizers Pigments Dyes Plasticizers Lubricants Curing agents Blowing agents Flame retardants

Injection Molding 8