Table 1. Visible light-initiated LRP of acrylates and acrylamides using I as both initiator and mediator at ambient temperature a .
Entry | Monomer (equiv.) | Condition b | t (h) | Conv. c (%) | M n,th d | M n,GPC e | M w/M n e |
1 | MA (600) | Xe lamp | 92 | 74 | 38 700 | 38 900 | 1.14 |
2 | MA (600) | CFL | 72 | 67 | 35 300 | 37 300 | 1.09 |
3 | nBA (600) | Xe lamp | 72 | 81 | 62 900 | 64 200 | 1.23 |
4 | nBA (600) | CFL | 72 | 88 | 68 300 | 71 700 | 1.23 |
5 | tBA (600) | Xe lamp | 24 | 73 | 56 800 | 55 000 | 1.11 |
6 | tBA (600) | CFL | 24 | 73 | 56 800 | 57 900 | 1.15 |
7 f | tBA (600) | Dark | 36 | 0 | — | — | — |
8 f | DMA (600) | Dark | 48 | 0 | — | — | — |
9 | DMA (600) | Xe lamp | 12 | 76 | 45 800 | 41 200 | 1.16 |
10 | DMA (600) | CFL | 12 | 79 | 47 600 | 43 100 | 1.16 |
11 | DEA (600) | Xe lamp | 4 | 71 | 54 100 | 57 200 | 1.22 |
12 | DEA (600) | CFL | 4 | 70 | 54 800 | 55 900 | 1.19 |
13 | DEA (600) | Sunlight | 4 | 42 | 32 400 | 35 600 | 1.23 |
14 | AMO (200) | Xe lamp | 12 | 84 | 24 400 | 20 700 | 1.12 |
15 | AMO (200) | CFL | 12 | 88 | 25 400 | 21 100 | 1.13 |
a[M]0 = 1.0 M in benzene-d 6.
bA 500 W Xe lamp was used as the light source with a 420–780 nm filter, and the light intensity was 3 mW cm–2; a household CFL (compact fluorescent lamp, 27 W) was used as the light source, the light intensity was 3–5 mW cm–2 at the sample position; sunlight was used as the light source, and the sample was placed in a water bath at ambient temperature.
cThe monomer conversion was determined based on the 1H NMR spectra.
d M n,th = M w( I ) + M w(Monomer) × ratio × conv. (%), where ratio refers to the ratio of monomer to I.
eDetermined using gel permeation chromatography in DMF, calibrated against poly(methyl methacrylate) standards.
fSample was protected from light with aluminum foil.