Table 2.
ATRP of MAA Initiated by α-Bromophenylacetic Acid (BPAA) and PEG2kBPAa
| entry | M/RBr/AAc/cat | initiator | added salt | conv. % | time (h) | Mn,th (×10−3) | Mn,app (×10−3) | Ieff | Mw/Mn |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 200:1:1:0.1 | BPAA | NaBr 0.1 M | 71 | 4 | 12.4 | 20.3 | 0.61 | 1.58 |
| 2 | 200:1:1:0.1 | BPAA | NaBr 0.2 M | 42 | 4 | 7.4 | 14.4 | 0.51 | 1.49 |
| 3 | 200:1:1:0.1 | BPAA | NaCl 0.1 M | 81 | 4 | 14.1 | 44.1 | 0.32 | 1.93 |
| 4 | 200:1:1:0.1 | BPAA | NaCl 0.2 M | 74 | 4 | 13.0 | 55.1 | 0.24 | 1.89 |
| 5 | 200:1:1:0.2 | BPAA | NaBr 0.2 M | 31 | 4 | 5.6 | 7.8 | 0.72 | 1.44 |
| 6 | 200:1:1:0.1 | PEG2kBPA | NaBr 0.1 M | 61 | 4 | 12.7 | 19.6 | 0.65 | 1.58 |
| 7 | 200:1:1:0.1 | PEG2kBPA | NaBr 0.2 M | 39 | 4 | 8.9 | 10.3 | 0.86 | 1.55 |
| 8b | 500:1:0.5:0.5 | PEG2kBPA | NaBr 0.1 M | 48 | 7 | 22.9 | 20.7 | 1.11 | 1.47 |
a
[M] = 20 vol % for entry 1–4, 10 vol % for entry 5–8, in water/DMF = 80/20, [RBr] = 12 mM, T = 30 °C; Mn,app measured by THF GPC using universal PMMA standards after methylation of reaction samples.
b
AAc was fed in the reaction mixture in 6 h.