Silicone Doped Chitosan-Acrylamide Coencapsulated Urea Fertilizer: An Approach to Controlled Release Fertilizers

Table 1

Band assignment for CPAM, urea, and CPAM-1.

Urea	CPAM	CPAM-1	Assignment	Reference
3426			N-H	[32, 33]
3326	3339	3337	N-H	[32, 34]
3253			νOH (for H bonding associated with urea)	[35, 36]
	3192	3187	NH2	[26, 27, 31]
	2962	2935	νCH2	[28–31, 37, 38]
1676			νC=O & δ′NH2	[26, 27, 31, 39, 40]
	1648	1650	νC=C	[27, 28]
	1601	1602	δNH2
1588			νC-N	[29, 39, 40]
1458	1448	1447	βCH3  &  $C-N	[39, 40]
	1412	1414	ν of newly formed bonds
		1319	ν of newly formed bonds (N-acetylglucosamine-acrylate)
	1258		γNH2
1149		1174	νC=O & $CH2	[27, 31]
	1081	1097		[41]
	1013			[42–45]
	863
	791			[42–46]

$: scissoring, Γ: twisting, : torsion, and : wagging.
: symmetric stretching, : asymmetric stretching, and : bending vibration.