6. The efficiency of ABN in initiating polymerization at 60°C was determined by the

following strategy. They measured B, and v and calculated B. - B₁/v. The constant kd

was measured directly in the system, and from this quantity and the measured ratio B,/v

the fraction f could be determined. The following results were obtained for different

concentrations of initiator. Using k.-0.0388 h¹, evaluate f from these data. (where fis

your radical efficiency factor).

(10 points)

[I] (gL¹) Rp/ × 10ª (mol L−¹ s¯¹)

0.377

1.57

1.72

6.77

0.0556

0.250

0.250

1.00

1.50

2.50

10.9

17.1