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The linear correlation coefficient between the Raman intensity of the PP main characteristic band and the degree of degradation.
| Raman main characteristic band of PP/cm−1 | 832 | 967 | 1150 | 1324 | 1454 |
| The linear correlation coefficient (R) | 0.936 | 0.912 | 0.955 | 0.926 | 0.958 |
