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Theoretical and actual ratio of prepolymer PEGS.
| Sample | PEG Content % | Ratio (COOH/OH) | ||
|---|---|---|---|---|
| By 1H–NMR | Theoretical | By 1H–NMR | Theoretical | |
| 20PEGS-0.67C/H | 20.89 | 20 | 1.97/2.00 | 2.0/3.0 |
| 20PEGS-1.0C/H | 17.40 | 20 | 0.97/1.00 | 1.0/1.0 |
| 20PEGS-1.5C/H | 19.08 | 20 | 3.00/2.03 | 3.0/2.0 |
| 20PEGS-2.0C/H | 15.47 | 20 | 2.00/1.21 | 2.0/1.0 |
| 40PEGS-0.67C/H | 48.56 | 40 | 1.92/2.00 | 2.0/3.0 |
| 40PEGS-1.0C/H | 39.08 | 40 | 0.91/1.00 | 1.0/1.0 |
| 40PEGS-1.5C/H | 39.93 | 40 | 3.00/1.82 | 3.0/2.0 |
| 40PEGS-2.0C/H | 37.38 | 40 | 2.00/1.01 | 2.0/1.0 |
