EY/Cu mediated photo-ATRP of OEOMA500 with varying degrees of polymerizationa.
| No. | [OEOMA500]/[HOBiB]/[EYH2]/[CuBr2]/[TPMA] | [HOBiB] (mM) | Conv.b (%) | M n,th | M n,abs c | M n,app d | Đ d |
|---|---|---|---|---|---|---|---|
| 1 | 50/1/0.0025/0.05/0.15 | 6.0 | 74 | 18 500 | 16 500 | 17 000 | 1.22 |
| 2 | 100/1/0.005/0.1/0.3 | 3.0 | 81 | 40 500 | 38 000 | 34 000 | 1.16 |
| 3 | 200/1/0.01/0.2/0.6 | 1.5 | 84 | 84 000 | 79 500 | 62 000 | 1.15 |
| 4 | 400/1/0.02/0.4/1.2 | 0.75 | 79 | 158 000 | 179 000 | 121 000 | 1.16 |
| 5 | 600/1/0.03/0.6/1.8 | 0.5 | 73 | 219 000 | 305 000 | 188 000 | 1.16 |
| 6 | 800/1/0.04/0.8/2.4 | 0.325 | 68 | 272 000 | 483 000 | 275 000 | 1.15 |
| 7 | 1000/1/0.05/1.0/3.0 | 0.3 | 69 | 345 000 | 607 000 | 332 000 | 1.15 |
a
Reaction conditions [OEOMA500] = 300 mM, [HOBiB] = 6.0–0.3 mM, [EYH2] = 15 μM, [CuBr2] = 0.3 mM, [TPMA] = 0.9 mM in PBS with DMSO (10% v/v), irradiated for 30 min under green LEDs (520 nm, 9.0 mW cm−2) in an open vial with stirring at 500 rpm.
b
Monomer conversion was determined by using 1H NMR spectroscopy.
c
Molecular weight (Mn,abs) was determined by Mark–Houwink calibration (see ESI).
d
Apparent molecular weight (Mn,app) and dispersity (Đ) were determined by GPC analysis (DMF as eluent) calibrated to poly(methyl methacrylate) standards.