Polystyrene/Montmorillonite Nanocomposites: Study of the Morphology and Effects of Sonication Time on Thermal Stability

Table 4

The infrared spectra absorption data of Na-MMT and organo-MMT.

Assignments	Na-MMT	Organo-MMT	Shift (cm^−1)
OH stretching of structural hydroxyl groups (Al–OH)	3624	3626	2
OH stretching of water	3447	3430	−17
Asymmetric stretching of the CH2 (in CTAB)	—	2922	—
Symmetric stretching of the CH2 (in CTAB)	—	2852	—
OH bending of water	1639	1655	17
CH bending (in CTAB)	—	1476	—
Si–O stretching	1032	1032	—
Si–O stretching of the tetrahedral silica layers	915	911	−4
Si–O asymmetric bending	528	525	−3
Si–O asymmetric bending	466	465	−1