Table 3. Polymerization Results of (R)-5 with 4-Methoxybenzyl Alcohol and TBD at Ambient Temperature in Dichloromethane.
| polymer | catalyst | M:I:catalyst (molar ratio)a | time (h) | conversion (31P NMR) | Mn, Da (SEC)b | Đ (SEC)b | Mn, Da (theo)c | Mn, Da (1H NMR)d |
|---|---|---|---|---|---|---|---|---|
| PCBT10 | TBD | 10:1:2 | 6 | 96% | 3200 | 1.09 | 3800 | 3900 |
| PCBT21 | TBD | 20:1:2 | 8 | 98% | 4800 | 1.06 | 7700 | 8200 |
| PCBT32 | TBD | 30:1:4 | 24 | 95% | 6200 | 1.09 | 11 000 | 12 400 |
a
Initial monomer concentration for all entries was 0.25 M in dichloromethane.
b
Mn (SEC) and Đ (SEC) were measured by THF SEC calibrated using polystyrene standards.
c
Mn (theo) was calculated from the monomer to initiator ratio and corrected for the conversion.
d
Mn (1H NMR) was calculated by comparing the 1H NMR integration values for the resonance signals of the two aromatic protons ortho to the methoxy group of the 4-methoxybenzyl initiated chain terminus (6.89 ppm) with one alkenyl proton of the butylene side chain groups (5.85–5.72 ppm).