Additional Homework Problems

CDP7-K_B

The instantaneous number-average degree of polymerization, X_N, can be expressed as

          (CDP7-N₁)

(a)  Consider an additional termination step resulting from the combination of the initiator molecule and a free radical R_j:

          (CDP7-N₂)

(b)  Show that

          (CDP7-N₃)

where

(c)  Neglecting solvent transfer, show that

(d)  Explain how you can determine rate law parameters from experimental data obtained in a CSTR. Use sketches to elucidate your explanation.

(e)  Typical activation energies for the initiation, propagation, and termination steps are: 20 kJ/mol, 20 kJ/mol, and 9 kJ/mol. discuss the effect of temperature on free-radical polymerization.