Table 2. g-C3N4-Catalyzed RAFT Polymerizations under Blue LED (λmax = 465 nm) Irradiation.
| entry | [MMA]/[CPADB]a | g-C3N4b | α (%)c | Mn,theod | Mn,GPCe | Đe |
|---|---|---|---|---|---|---|
| 1 | 200:0 | |||||
| 2f | 200:1 | MA, 5 mg | ||||
| 3g | 200:1 | MA, 5 mg | ||||
| 4 | 200:1 | MA, 5 mg | 33 | 6600 | 6800 | 1.25 |
| 5 | 200:0 | MA, 5 mg | 45 | 8900 | 127 500 | 1.95 |
| 6f | 200:1 | TCA, 5 mg | ||||
| 7g | 200:1 | TCA, 5 mg | ||||
| 8 | 200:1 | TCA, 5 mg | 50 | 10 100 | 10 300 | 1.18 |
| 9 | 200:0 | TCA, 5 mg | 93 | 18 700 | 274 600 | 1.61 |
| 10 | 200:1 | TCA-NS, 5 mg | 72 | 14 400 | 14 800 | 1.08 |
The polymerizations were performed in 1 mL of DMSO using 4-cyanopentanoic acid dithiobenzoate (CPADB) as a chain transfer agent (CTA) for 16 h under irradiation of blue LED light (λmax = 465 nm, 3 mW/cm2). The molar ratio of [MMA]/[CPADB] is 200:1.
“MA” represents melamine-derived g-C3N4, “TCA” represents trithiocyanuric acid-derived g-C3N4, and “TCA-NS” represents the soluble TCA-g-C3N4 nanosheets.
Monomer conversion was determined by online Fourier transform near-infrared (FT-NIR) spectroscopy.
The theoretical molecular weight was calculated according to the equation Mn,theo = [M]0/[CPADB]0 × MWM × α + MWCPADB, where [M]0, [CPADB]0, MWM, α, and MWCPADB represent the initial monomer concentration, initial CPADB concentration, molar mass of the monomer, conversion, and molar mass of CPADB.
The molecular weight and dispersity were determined by GPC using tetrahydrofuran (THF) as an eluent.
The polymerization was performed in the dark.
The polymerization was performed at 45 °C in the dark.