Table 1 Time in which the sample reaches a determined swelling percent, for different pH values
Room temperature (23 °C) | pH 2 | pH 7 | pH 10 |
|---|---|---|---|
Swelling (%) | time (min) | time (min) | time (min) |
20 | 7.1 | 11.7 | 10.8 |
40 | 25.2 | 26.6 | 24.3 |
60 | 45.5 | 42.4 | 39.8 |
80 | 76.9 | 61.6 | 58.0 |
100 | 132.9 | 85.6 | 80.8 |
120 | --- | 122.4 | 112.9 |