. 2019 Feb 20;11(2):366. doi: 10.3390/polym11020366

Table 2.

NIR characteristic bands and their assignments for the samples studied.

Theophylline	IPC 72/28		AgA-g-PNIPAAm				Assignment
	IPC 72/28		C43		C68
	Without THP	With THP	Without THP	With THP	Without THP	With THP
1170	1163		1160	1152	1160	1152	C–H second overtone
1367	1372	1361	1367	1357			First C–H overtone and combinations
	1433	1437 sh			1441		N–H stretch 1st overtone
	1631 sh	1631 sh	1631 sh	1623s	1635		N–H stretch 1st overtone
1676	1665	1673	1669	1665	1665	1665	C–H stretch 1st overtone
1710	1714	1714s	1718	1707	1722	1711	C–H stretch 1st overtone
1819 1882	1817 sh 1878						C–O and O–H combinations
1819 1882	1817 sh 1878	1874	1874	1870	1870	1865	C–O and O–H combinations
2004	2015	2015	2007s	2007	2011	2015	O–H bend second overtone
2095	2090	2095	2090	2095	2090	2098	O–H and N–H combinations
2137	2140	2144	2136	2140	2140	2144	N–H combinations
2254	2258	2254	2209; 2258	2197; 2258	2197; 2254	2197; 2254	O–H and C–H combinations
2321 2376	2326 2376	2326 2376	2322; 2376	2326; 2376	2322; 2374	2330; 2372	C–H stretch/CH₂ deformation
2429 2475	2436 2476	2436 2474	2433; 2478	2430	2430; 2478	2429; 2478	C–H and C–C combinations C–N–C stretch overtone