Table 1.
Ring opening polymerization of ε-caprolactone (CL) using 6-azido-1-hexanol initiator and diphenyl phosphate catalyst in toluene a.
| Polymer | [M]/[I] b | Reaction Time (h) | Yield c (%) |
Mn,theo
d (g/mol) |
e (g/mol) |
f (g/mol) |
PDI g |
|---|---|---|---|---|---|---|---|
| N3-PCL20-OH | 20 | 2.0 | 96.5 | 2440 | 2680 | 2700 | 1.10 |
| N3-PCL30-OH | 30 | 5.0 | 97.3 | 3600 | 3940 | 4900 | 1.06 |
| N3-PCL50-OH | 50 | 8.0 | 97.2 | 5900 | 6250 | 7700 | 1.09 |
| N3-PCL70-OH | 70 | 10.0 | 96.5 | 8200 | 7850 | 10,700 | 1.09 |
| N3-PCL90-OH | 90 | 14.0 | 96.8 | 10,500 | 10,100 | 12,600 | 1.08 |
| N3-PCL100-OH | 100 | 20.0 | 96.4 | 11,700 | 11,900 | 16,200 | 1.06 |
| N3-PCL150-OH | 150 | 29.0 | 97.3 | 17,400 | 17,200 | 20,800 | 1.07 |
| N3-PCL200-OH | 200 | 42.0 | 97.1 | 23,100 | 24,300 | 26,400 | 1.07 |
a Reaction temperature, 25 °C; [M], 1.0 mol/L. b Molar ratio of initial monomer and initiator. c Polymerization yield. d Molecular weight calculated from the conversion and the monomer to initiator ratio: [([M]/[I]) × conversion × (Mw of CL)] + (Mw of I). e Number-average molecular weight determined by 1H nuclear magnetic resonance (NMR) spectroscopy analysis. f Number-average molecular weight determined THF by using gel permeation chromatography (GPC) analysis calibrated with polystyrene (PS) standards. g Polydispersity index determined by using GPC analysis calibrated with PS standards.