Research Article
Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin
Table 2
Main FTIR bands attributed to PMMA and MMA [
20].
| Bands (cm−1) | Attribution | MMA | PMMA |
| 2989 | 2962 | Axial deformation of the C-H bond of the -CH3 group | 2954 | 2923 | Axial deformation of the C-H bond of the -CH2 group | 1719 | 1728 | Axial deformation of the C=O group of the ester group | 1635 | — | C=C connection vibration | 1438 | 1434 | Symmetrical angular deformation of the group -CH2 | 1380 | 1381 | Angular deformation of the -CH3 group | 1301 | 1280 | C-O vibration of the trans-conformation ester group | 1191 | 1196 | Vibration of the trans-conformation group -O-CH3 | — | 1144 | C-C vibration of polymer chain | — | 842 | C-C of the syndiotactic conformation of the polymer chain | 750 | 751 | Asymmetrical angular deformation of the CH2 group |
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