Table 1. Results on ROP of 2-Oxazolines Initiated with MeOTs.
| entry | [ROx]:[Ox1]:[I]a | polymerb | yield (%) | DPc (m,n) | Mn,NMR (kDa)c | Mn,GPC (kDa)d | PDId |
|---|---|---|---|---|---|---|---|
| 1 | 0:10:1 | POx1 | 86.0 | 0, 6e | 5.26 | 1.15 | |
| 2 | 5:5:1 | PEtOx4-b-POx15 | 76.1 | 4.2, 4.7 | 1.42 | 4.92 | 1.10 |
| 3 | 10:7:1 | PEtOx10-b-POx16 | 72.3 | 10.4, 6.2 | 2.20 | 6.60 | 1.13 |
| 4 | 42:7:1 | PEtOx42-b-POx17 | 94.6 | 42.4, 7.1 | 5.47 | 9.92 | 1.12 |
| 5 | 10:7:1 | PPeOx10-b-POx16 | 65.8 | 9.7, 5.5 | 2.65 | 5.21 | 1.15 |
a
Molar ratio in feed, ROx represents EtOx or PeOx; [I] = 2 mol L–1, 80 °C, acetonitrile, the polymerization time for both blocks was 2 h; the conversion of the first monomer (EtOx or PeOx) was more than 98%, estimated from 1H NMR spectra recorded prior to the addition of Ox1.
b
The subscript denotes the average number of repeating units of the polymer determined by 1H NMR analysis.
c
Degree of polymerization and molecular weight calculated by 1H NMR integration.
d
Determined by GPC in TFIP using PMMA calibration, PDI = polydispersity index.
e
Estimated based on 1H NMR analysis for the diblock copolymers;reliable1H NMR spectra were unavailable for POx1 due to its poor solubility in common deuterated solvents.