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Summary of multi-arm PEGs modified with alendronic acid at the chain termini: molecular weight (Mw), number of arms (f), arm molecular weight (Ma), and overlapping concentration (C*).
| Polymer | Mw (kDa) | f | Ma (kDa) | Yield (1H-NMR) | C*=1/[η] (wt%) |
|---|---|---|---|---|---|
| P(8)10-AA | 10 | 8 | 1.25 | 84% | 12.3 |
| P(8)20-AA | 20 | 8 | 2.5 | 87% | 7.5 |
| P(8)40-AA | 40 | 8 | 5 | 85% | 4.6 |
| P(4)10-AA | 10 | 4 | 2.5 | 87% | 7.4 |
Specific viscosity [η] was calculated from Mark-Houwink-Sakurada parameters (α = 0.716, and K as function of f).24
