Table 1 Results of the sulfonation experiments expressed in terms of the number of milliequivalents of ~SO 3 H groups per gram of sulfonated polymer
| Temperature time | 30°C | 70°C | 110°C |
|---|---|---|---|
| 1 h | 0.42 ± 0.01 | 4.30 ± 0.17 | 2.66 ± 0.15 |
| 3 h | 1.23 ± 0.06 | 5.13 ± 0.21 | 2.40 ± 0.20 |
| 5 h | 0.82 ± 0.03 | 3.83 ± 0.12 | N/A |
