Table 1. Yields of the Bulk Depolymerization of Polymethacrylates under Different Conditions.
| run | polymers (P, 0.5 g) | DPb | [P-Cl]/[CuCl2]/[TPMA] | T (°C) | time (min) | conv. (%)c | recovered monomer (%)d |
|---|---|---|---|---|---|---|---|
| 1 | PBMA-Cl | 25 | 1/0.22/0.22 | 150 | 60 | 20 | 84 |
| 2 | PBMA-Cla | 25 | 1/0.22/0.22 | 150 | 60 | 35 | 84 |
| 3 | PBMA-Br | 25 | 1/0.22/0.22 | 150 | 60 | 8 | |
| 4 | PBMA-Cl | 25 | 1/0/0 | 200 | 60 | 2.4 | |
| 5 | PBMA-Cl | 25 | 1/0.22/0.22 | 200 | 60 | 73 | 92 |
| 6 | PMMA-Cl | 25 | 1/0.22/0.22 | 200 | 60 | 70 | 85 |
| 7 | PBMA-Cl | 25 | 1/0.22/0.22 | 200 | 120 | 74 | 90 |
| 8 | PBMA-Cl | 60 | 1/0.22/0.22 | 200 | 60 | 74 | 82 |
| 9 | PBMA-Cla | 25 | 1/0.22/0.22 | 200 | 60 | 35 | 84 |
| 10 | PBMA-Cl | 25 | 1/0.22/0.22 | 200 | 15 | 74 | 91 |
| 11 | PMMA-Cl | 25 | 1/0.22/0.22 | 200 | 15 | 69 | 85 |
| 12 | PBMA-Cl | 25 | 1/0.22/0.22 | 230 | 15 | 84 | 84 |
| 13 | PMMA-Cl | 25 | 1/0.22/0.22 | 230 | 15 | 73 | |
| 14 | PBMA-Cl | 25 | 1/0.0022/0.0022 | 200 | 60 | 22 | 60 |
| 15 | PBMA-Cl | 25 | 1/0/0.0022/0.0022 | 230 | 60 | 22 | 62 |
| 16 | PBMA-Cla | 25 | 1/0.0022/0.0022 | 200 | 60 | 45 | 82 |
| 17 | PBMA-Cl | 25 | 1/0.022/0.022 | 230 | 60 | 70 | 99 |
a
Under UV irradiation (λ = 370 nm).
b
Degree of polymerization.
c
Calculated based on the loss of polymer weight in the distillation flask.
d
Weight fraction of obtained monomer based on the weight loss of the polymer.