5. Consider the polymerization of styrene in toluene at 60°C initiated by di-t-

byggside for a solution containing 0.04 mol of initiator and 2 mol of monomer per

liter respectively. The initial rates of initiation, B., and propagation, B., are found to be

1.6x 10-10 Ms and 6.4 x 10 Ms", respectively, at 60°C.

a. Cakulate and

(5-points)

b. Assuming no chain transfer, calculate the initial kinetic chain length. 6 points)

c. Cakulate the conversion obtained after the reaction has gone for 5 h. (5 points)

d. Assuming only disproportionation and under the conditions stated, the transfer

constant of styrene, C, is 0.85 x 10%. How much does this transfer affect the

molecular weight of the polymer?

(5 points)

e. The molecular weight of this polymer is too high. The desired molecular weight

of this polymeris 40,000 g mol". How much CC14 (in g L") should be added to

the reaction medium to attain the desired molecular weight?C, of CC14 is 9x 107

¹. (5 points)