Table 1.
Characteristic of branched polyanhydrides.
| Polyanhydride | Number of DBB Molecules per 1 PEG Molecule (Feed Ratio) |
Number of DBB Molecules per 1 PEG Molecule in Copolymers (1H NMR) |
Molecular Weight (MALS) |
DSC | ||
|---|---|---|---|---|---|---|
| Mn | Mw | DP | Tg (°C) | |||
| DBB_PEG_COOH_5 | 39.9 | 30.8 | 13,400 | 49,800 | 3.72 | 103.4 |
| DBB_PEG_COOH_10 | 18.9 | 13.3 | 15,600 | 51,600 | 3.32 | 64.0 |
| DBB_PEG_COOH_20 | 8.4 | 10.8 | 16,000 | 48,800 | 3.05 | 78.6 |
| DBB_PEG_COOH_30 | 4.9 | 6.9 | 12,100 | 33,300 | 2.75 | −22.2; 54.3 |
| DBB_PEG_COOH_40 | 3.2 | 3.5 | 9900 | 22,800 | 2.30 | −31.2 −35.3 |
| DBB_PEG_COOH_50 | 2.1 | 2.4 | 11,300 | 15,500 | 1.37 | |
| DBB_PEG_COOH_60 | 1.4 | 2.0 | 10,900 | 14,700 | 1.35 | −34.2 |
| DBB_PEG_COOH_70 | 0.9 | 1.0 | 10,300 | 13,600 | 1.32 | −40.7 |
| DBB_PEG_COOH_80 | 0.5 | 0.6 | 12,500 | 16,400 | 1.31 | −41.8 |
| DBB_PEG_COOH_90 | 0.2 | 0.04 | — | — | — | −43.2 |
DBB:PEG_COOH in polymer (1H NMR) calculated according to Equations (1)–(3), Tg—glass temperature of polymers determined as a midpoint of glass transition.