Table 3. Common peaks of M1~M18 FTIR absorption.
| Sample | Wave number/cm -1 | ||||||||
| M1 | 3380.70 | 2927.14 | 1697.90 | 1609.27 | 1513.93 | 1449.18 | 1354.62 | 1238.54 | — |
| M2 | 3369.65 | 2929.21 | 1697.46 | 1609.02 | 1514.56 | 1448.76 | 1355.84 | 1237.49 | 1142.48 |
| M3 | 3365.17 | 2927.10 | 1698.14 | 1609.14 | 1516.28 | 1448.93 | 1355.10 | 1238.36 | 1142.77 |
| M4 | 3372.86 | 2928.06 | 1697.77 | 1609.98 | 1513.94 | 1449.07 | 1358.24 | 1238.85 | — |
| M5 | 3373.23 | 2927.81 | 1700.74 | 1610.45 | 1514.33 | 1449.34 | 1354.00 | 1239.39 | — |
| M6 | 3377.44 | 2928.13 | 1696.30 | 1611.60 | 1518.16 | 1448.93 | 1356.21 | 1236.71 | 1143.82 |
| M7 | 3373.34 | 2925.65 | 1698.39 | 1608.92 | 1513.96 | 1448.88 | 1355.33 | 1239.76 | — |
| M8 | 3369.39 | 2928.44 | 1697.80 | 1609.48 | 1513.64 | 1449.08 | 1357.40 | 1238.86 | — |
| M9 | 3381.26 | 2926.57 | 1696.72 | 1609.89 | 1514.66 | 1448.86 | 1353.83 | 1237.44 | 1142.66 |
| M10 | 3384.23 | 2926.82 | 1697.2 | 1609.02 | 1514.14 | 1448.9 | 1355.01 | 1237.69 | 1142.93 |
| M11 | 3383.08 | 2924.68 | 1697.66 | 1610.43 | 1515.44 | 1448.74 | 1352.77 | 1238.20 | 1142.69 |
| M12 | 3380.62 | — | 1696.67 | 1609.32 | 1513.83 | 1448.65 | 1353.16 | 1235.59 | 1143.66 |
| M13 | 3372.38 | 2927.02 | 1697.51 | 1610.12 | 1514.12 | 1449.00 | 1355.88 | 1237.88 | 1141.40 |
| M14 | 3385.58 | 2925.70 | 1701.26 | 1610.35 | 1514.26 | 1449.86 | 1359.77 | 1238.85 | — |
| M15 | 3374.93 | 2927.39 | 1698.17 | 1609.31 | 1514 | 1448.81 | 1359.02 | 1238.53 | 1141.64 |
| M16 | 3377.28 | 2926.61 | 1697.03 | 1611.27 | 1512.78 | 1448.79 | 1354.26 | 1236.87 | 1142.65 |
| M17 | 3376.22 | 2926.82 | 1697.52 | 1609.02 | 1513.33 | 1448.57 | 1355.31 | 1237.06 | 1143.23 |
| M18 | 3381.82 | 2926.51 | 1697.71 | 1609.27 | 1513.68 | 1448.78 | 1356.17 | 1236.50 | 1143.94 |
| Average | 3376.62 | 2927.04 | 1697.89 | 1609.77 | 1514.39 | 1448.95 | 1355.66 | 1237.92 | 1142.82 |
| Maximum difference | 20.41 | 4.53 | 4.96 | 2.68 | 5.38 | 1.29 | 7.00 | 4.17 | 2.54 |
| Sample | Wave number/cm -1 | ||||||||
| M1 | 1048.35 | — | 869.52 | 825.15 | 766.81 | 629.04 | — | — | |
| M2 | 1044.86 | 944.03 | 869.54 | 823.00 | 767.14 | 627.93 | — | 547.63 | |
| M3 | 1044.46 | — | 869.47 | 818.49 | 766.67 | 630.74 | — | — | |
| M4 | 1048.82 | 926.47 | 870.92 | 822.44 | 767.20 | — | 594.23 | — | |
| M5 | 1048.76 | — | 870.64 | 819.03 | 767.21 | — | 598.34 | — | |
| M6 | 1038.13 | — | 868.09 | 821.76 | 767.35 | 634.63 | — | — | |
| M7 | 1045.11 | — | 869.04 | 826.91 | 766.31 | — | 590.36 | — | |
| M8 | 1049.24 | 926.40 | 868.71 | 826.88 | 767.18 | — | 593.47 | — | |
| M9 | 1037.93 | — | 871.05 | 818.49 | 766.24 | 630.89 | — | — | |
| M10 | 1038.07 | — | 869.30 | 818.37 | 766.74 | 628.60 | — | — | |
| M11 | 1038.08 | — | 869.10 | 819.10 | 766.84 | 627.45 | — | — | |
| M12 | 1035.60 | — | 870.04 | 818.61 | 766.29 | 629.53 | — | — | |
| M13 | 1044.86 | — | 868.77 | 825.29 | 766.59 | — | 596.19 | — | |
| M14 | 1045.96 | — | 867.50 | 826.28 | 765.96 | — | 584.16 | — | |
| M15 | 1041.91 | — | 869.19 | 817.62 | 766.28 | 628.76 | — | 547.37 | |
| M16 | 1040.83 | — | 868.43 | 822.38 | 766.47 | 625.63 | — | — | |
| M17 | 1038.24 | — | 869.64 | 818.32 | 766.45 | 629.04 | — | — | |
| M18 | 1035.73 | — | 869.48 | 817.30 | 765.36 | 628.65 | — | — | |
| Average | 1042.50 | 932.30 | 869.36 | 821.41 | 766.67 | 629.24 | 592.79 | 547.50 | |
| Maximum difference | 13.64 | 17.63 | 3.55 | 9.61 | 1.99 | 9.00 | 14.18 | 0.26 | |
"-" means that the sample has no this wave number.