Role of Polymer Interactions with Clays and Modifiers on Nanomechanical Properties and Crystallinity in Polymer Clay Nanocomposites

Table 3

Band assignments of photoacoustic FTIR spectra of OMMT, PBT, and PCN.

Sample	Wave number range (cm^-1)	Bands	Reference
	3646–3628	O–H stretching of structural hydroxyl group	[26]
	3256–3035	Ionic bonded N–H stretching
	2932	C–H asymmetric stretching
	2853	C–H symmetric stretching
	1713–1701	C=O stretching
	1623	Combination of O–H deformation and N–H bending
	1511	Asymmetric R–COO^- stretching
	1466	CO–H bending
	1396	Symmetric R–COO^- stretching
	1112	Si–O in-plane stretching
	1060	Si–O out-of-plane stretching
OMMT	1022,997	Si–O in-plane stretching
	963	Si–OH vibrations
	921	Al–O/Al–OH stretching vibration
	884	Al–FeOH deformation
	847	Al–MgOH deformation
	799	Si–O stretching of quartz and silica
	727	Si–O deformation perpendicular to optical axis
	699	Si–O deformation parallel to optical axis
	623	Coupled Al–O and Si–O out-of-plane vibration
	531	Al–OSi deformation
	478	Si–OSi vibration
	3417	–OH stretching
	3052	Aromatic C–H stretching	[35]
	2962	C–H2 stretching	[36]
	2895	Aliphatic C–H asymmetric stretching	[35]
	2863	Aliphatic C–H symmetric stretching	[35]
	1722	C=O stretching	[37]
	1583	Aromatic C=C stretching	[38]
	1504	Aliphatic C–H2 bending	[37]
	1453	Aliphatic C–H2 bending	[39]
	1407	Aliphatic aromatic C–H in-of-plane bending	[36]
PBT	1387	CH2 wagging	[39]
	1281	(C=O–)–O stretching	[35]
	1110	CH2–O stretching	[35]
	1017	Aromatic C–H bending	[35]
	873	Aromatic C–H bending	[40]
	808	Aromatic C–H bending	[37]
	729	Aromatic C–H out-of-plane bending	[35, 36]
	685	Aromatic =C–H out-of-plane deformation	[38]
	633	Aromatic in-plane deformation	[38]
	497	Aromatic out-of-plane deformation	[38]
	476	Aromatic out-of-plane deformation	[38]
	3633–3679	O–H stretching of structural hydroxyl group-OMMT	[26]
	3413	–OH stretching
	3260–3047	Coupled N–H stretching and aromatic C–H stretching	[35]
	2963	C–H2 stretching	[36]
	2895	Aliphatic C–H asymmetric stretching	[35]
	2858	Aliphatic C–H symmetric stretching	[35]
	1719	C=O stretching	[37]
	1576	Aromatic C=C stretching	[38]
	1503	Aliphatic C–H2 bending	[37]
	1452	Aliphatic C–H2 bending	[39]
	1406	Aromatic C–H in-of-plane bending	[36]
PCN	1387	CH2 wagging	[39]
	1278	(C=O–)–O stretching	[35]
	1105	CH2–O stretching	[35]
	1020	Aromatic C–H bending	[35]
	873	Aromatic C–H bending	[40]
	810	Aromatic C–H bending	[37]
	729	Aromatic C–H out-of-plane bending	[35, 36]
	685	Aromatic =C–H out-of-plane deformation	[38]
	652	Aromatic in-plane deformation	[38]
	624	Tripled Al–O, Si–O out-of-plane and aromatic in-plane deformation	[26]
	497	Aromatic out-of-plane deformation	[38]
	463	Si–OSi deformation	[26]