Table 2. Reaction Conditions and Properties of RPs Recovered from PUFs by Two-Step Aminolysisa.
| amino/urethane group
ratio in equivalents |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| entry | PUF type | TREN | HMDA | PUF/V/reagent (g/g/g) | reagent (wt %) | urethane group content (mol %) | amino end group content (mol %) | TDA content (wt %) | allyl group | Mw (kg mol–1) | Đ |
| 1a | PUF5611 I-step | 2.25 | 6/3/0.44 | 7.3 | 5.8 | 5.8 | 6.0 | no | 3.1 | 1.02 | |
| 1b | RP5611 II-step | 4.00 | 6 RP/0.07 TREN | 1.2b | 0 | 0 | 7.7 | no | 3.0 | 1.02 | |
| 2a | PUF4811 I-step | 2.25 | 6/3/0.38 | 6.3 | 6.4 | 6.2 | 6.4 | no | 3.5 | 1.02 | |
| 2b | RP4811 II-step | 4.00 | 6 RP/0.07 TREN | 1.1b | 0 | 0 | 8.5 | no | 3.5 | 1.02 | |
| 3a | PUF5611 I-step | 4.00 | 6/3/0.92 | 15.3 | 7.3 | 6.9 | 7.1 | no | 3.1 | 1.02 | |
| 3b | RP5611 II-step | 6.00 | 6 RP/0.10 TREN | 1.8b | 0 | 0 | 9.6 | no | 3.0 | 1.02 | |
a
The contents of urethane groups, TDA, and amino end groups in RP were calculated according to eqs S1–S3, respectively.
b
In the second aminolysis step, TREN is given in wt % per RP.