Comparison of PB molecular parameters prepared via Nd(CF3SO3)3*3TOP and Nd(CF3SO3)3*3TBP systems a.
| Run | Binary catalyst | Temperature (°C) | Yield (%) | M n × 104e (g mol−1) | M w/Mne | cis-1,4f (%) | trans-1,4f (%) | 1,2f (%) |
|---|---|---|---|---|---|---|---|---|
| 1b | Nd(CF3SO3)3 | 50 | — | — | — | — | — | — |
| 2c | Nd(CF3SO3)3*3TOP | 20 | 88.2 | 9.8 | 1.32 | 98.8 | 0.5 | 0.7 |
| 3d | Nd(CF3SO3)3*3TOP | 50 | 90.3 | 10.3 | 1.46 | 98.7 | 0.6 | 0.7 |
| 4c | Nd(CF3SO3)3*3TBP | 20 | 83.5 | 8.7 | 3.21 | 98.6 | 0.5 | 0.9 |
| 5d | Nd(CF3SO3)3*3TBP | 50 | 86.9 | 9.0 | 3.45 | 98.6 | 0.6 | 0.8 |
a
Polymerization conditions: solvent is hexane, [Nd] = 8.9 × 10−4 mol L−1, [Al]/[Nd] = 20, [Bd]/[Nd] = 2000.
b
Polymerization time is 24 h.
c
Polymerization time is 2 h.
d
Polymerization time is 30 min.
e
Measured by SEC-MALLS.
f
Measured by FT-IR spectroscopy.