Table 1.
The composition and PEG and PCL block lengths of synthesized PCL-b-PEG-b-PCL triblock copolymers as determined by 1H-NMR after purification.
| Target Structure | Mn of PEG Block a | CL Conversion b | Mn of PCL Blocks | PEG Content | Mn of Triblock Copolymer |
|---|---|---|---|---|---|
| (kg/mol) | (%) | (kg/mol) | (mol%) | (kg/mol) | |
| PCL3-PEG14-PCL3 | 13.9 | 99.2 | ½ × 5.9 | 70.2 | 19.8 |
| PCL5-PEG10-PCL5 | 9.9 | 99.4 | ½ × 10.0 | 49.8 | 19.9 |
| PCL7-PEG6-PCL7 | 5.9 | 99.8 | ½ × 14.1 | 29.5 | 20.0 |
a Mn of PEG used as an initiator in the ring opening polymerization of CL. b CL conversion was determined before purification.