Table 1.
Mn, Mw and polydispersity indices (PDI) of samplings taken at various times for the test polymerisation of ε-CL with the catalytic system Al-2,2′-methylenebis(6-tert-butyl-4-methylphenol)- isopropanol (Al-MDBP-I) in toluene a.
| Time (min) | Mn (g mol−1) | Mw (g mol−1) | PDI | ε-CL Conversion (%) | Theoretical Mw (g mol−1) |
|---|---|---|---|---|---|
| 30 | 2106 | 2481 | 1.178 | 4 | 2200 |
| 60 | 4051 | 4662 | 1.151 | 8 | 4300 |
| 90 | 5646 | 6411 | 1.135 | 11 | 6000 |
| 120 | 7120 | 8101 | 1.138 | 15 | 8100 |
| 150 | 8459 | 9467 | 1.119 | 18 | 9700 |
| 180 | 9547 | 10,765 | 1.128 | 22 | 11,900 |
| 210 | 10,688 | 11,782 | 1.102 | 25 | 13,500 |
a Reaction conditions: temperature = 40 °C; solvent = 250 mL toluene; Al-MDBP: 0.37 mmol; I: 0.37 mmol; ε-CL: 0.176 mol; ratio CL:Al:I = 480:1:1.