Table 2.
The impact of reaction conditions on degree of substitution of isocyanates (DSNCO), degree of carbamation (DSTDI), and the efficiency of CNC carbamation. Time and CNC amount were kept constant (24 h and 1.0 g, respectively).
| T (°C) | TDI/CNCs Ratio | DSNCO (%) | DSTDI (%) | DSNCO/DSTDI (%) |
|---|---|---|---|---|
| 35 | 1 | 3.2 ± 0.0 | 4.5 ± 0.1 | 72 |
| 2 | 5.5 ± 0.3 | 6.8 ± 0.2 | 81 | |
| 3 | 7.2 ± 0.3 | 7.7 ± 0.1 | 93 | |
| 4 | 7.2 ± 0.3 | 10.8 ± 0.8 | 67 | |
| 5 | 7.2 ± 0.3 | 17.4 ± 2.0 | 43 | |
| 45 | 1 | 4.9 ± 0.3 | 7.4 ± 0.2 | 66 |
| 2 | 5.8 ± 0.0 | 7.9 ± 0.2 | 73 | |
| 3 | 6.7 ± 0.3 | 8.4 ± 0.0 | 80 | |
| 4 | 7.2 ± 0.3 | 12.3 ± 2.0 | 58 | |
| 5 | 7.2 ± 0.3 | 21.2 ± 0.9 | 34 | |
| 55 | 1 | 5.8 ± 0.6 | 9.6 ± 0.2 | 61 |
| 2 | 6.4 ± 0.0 | 11.3 ± 0.3 | 56 | |
| 3 | 6.7 ± 0.3 | 12.5 ± 0.5 | 53 | |
| 4 | 7.2 ± 0.3 | 17.5 ± 1.1 | 41 | |
| 65 | 1 | 5.5 ± 0.3 | 12.3 ± 0.1 | 45 |
| 75 | 1 | 4.9 ± 0.3 | 14.2 ± 0.3 | 34 |