Calculate the time needed to convert half of charge of methyl methacrylate (10 g per 100 mL solution) to polymer using benzoyl peroxide (0.1 g per 100 mL solution) as initiator in benzene at 60C. What number-average degree of polymerization will be expected initially ? What fraction of the initiator will remain unused after 50% conversion of the monomer ? [At 60C, kd = 4.47x10-6 s; k/k, = 10-2 L/mol- s; f = 0.4; termination occurs by both disproportionation (58%) and coupling (42%).] [Ans. 24.7 h; 739; 0.67]