CM4650 Polymer Rheology
1. (5 points) 6.3 (Question about tension-thinning)
2. (5 points) 6.7 (Which polymer has broadest MWD?)
3. (5 points) In the step-shear strain experiment, we
measure G(t,g). In words, describe how G
varies with time at constant strain. Describe how G varies with
strain g.
4. (5 points) For
a linear polymer of high molecular weight, what is the value of G' at
high frequencies? What is a typical value of the plateau
modulus? How does G' vary with frequency at low frequency?
How does G" vary with frequency at low frequency?
5. (20 points) 7.13 (Predict steady planar elongational
flow material functions for PL GNF)
6. (20 points) 7.28 (flow down an inclined plane of a PL
GNF) Note that there are three parts to this question.
7. (30 points) 7.30 (tangential annular flow of a PL GNF)
Note
that there are three parts to this question: 1) calculate
velcity and pressure profiles; 2) Calculate the torque required; 3)
Plot the velocity field.