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