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Conditions and results of ring-opening polymerization from pPR.
| polymerization conditions | GPR | |||
| run | Mn | Mw | Yielda | |
| 1 | 60 °C, 48 h | 97,000 | 115,000 | 69% |
| 2 | rt, 6 h → 40 °C, 24 hb | 181,000 | 209,000 | 33% |
| 3 | rt, 48 h | 167,000 | 197,000 | 3% |
| 4 | 130 °C, 10 h | (11,000)c | (15,000)c | 0% |
| 5 | 0 °C, 7 h | (780)c | (850)c | 0% |
aYields based on polymer backbone. bTemperature increased after 6 h. cMolecular weights of byproducts.
