Table 2.
Hydrolysis rates of GPS with different catalysts. Reprinted with permission from [26]. Copyright Elsevier, 2006.
| Catalyst | Solvent | Rate Constant/10−4 min−1 |
|---|---|---|
| None | d6-acetone | <0.01 |
| Zinc acetylacetonate hydrate (ZnAA) | d6-acetone | 4.3 |
| Zirconium acetylacetonate (ZAA) | d6-acetone | 2.0 |
| Aluminium acetylacetonate (AAA) | d6-acetone | 6.0 |
| Zirconium tetrakis(2,2,6,6-tetramethyl-3,5-heptadionate) ZTT | d6-acetone | 18 |
| Zinc bis(2,2,6,6-tetramethyl-3,5-heptanedionate) ZTH | d6-acetone | 0.45 |
| Chromium (III) acetylacetonate | d6-acetone | <0.01 |
| Chromium (III) acetylacetonate (1% by mass) | d6-acetone | <0.01 |
| Zinc acetylacetonate hydrate (ZnAA) | d6-ethanol | 4.3 |
| Aluminium acetylacetonate (AAA) | d6-ethanol | 18 |
| Zinc bis(2,2,6,6-tetramethyl-3,5-heptanedionate) (ZTH) | d6-ethanol | 22 |
| Chromium (III) acetylacetonate | d6-acetone | <0.01 |
| Chromium (III) acetylacetonate (1% by mass) | d6-acetone | <0.01 |
Mass ratio of solvent:D2O:silane:catalyst is 94.96:4:1:0.04 unless otherwise stated.