Table 3.
Effect of PAMAM auxiliaries on the Ts of bovine hides cross-linked with EDC/NHS.
| Entry | Dendrimer | Tanning agent | Surface NH2 | COOHcoll/NH2 a (mol/mol) | Ts (°C) |
|---|---|---|---|---|---|
| 1 | - | EDC/NHS | 0 | 1.2/0.8 | 79 |
| 2 | 2G1.0 | EDC/NHS a | 8 | 1.2/3.2 | 92 |
| 3 | 2-Triet-G0.0 | EDC/NHS a | 5 | 1.2/2.3 | 87 |
Reaction Conditions: 100 g of bovine hide (0.12 mol of COOHcoll), 300 mL water, pH 5.5, reaction time: 18 h, temperature: 25 °C, COOHcoll/EDC/NHS (mol/mol/mol): 1/2/2, 0.03 mmol of PAMAM dendrimer. a Sum of free NH2 functional groups present in the dendrimer and in the collagen protein.