The peak height ratio of 3267 cm−1 and 2940 cm−1 in the infrared spectrum of different membranes.
| Membrane | GOP-0.0 | GOP-0.5 | GOP-1.0 | GOP-2.0 | GOP-3.0 | GOP-4.0 |
|---|---|---|---|---|---|---|
| h (3267 cm−1)/h (2940 cm−1) | 1.384 | 1.360 | 1.334 | 1.312 | 1.282 | 1.255 |
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