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. 2018 Dec 10;8(71):40765–40777. doi: 10.1039/c8ra08579j

Assignment of ATR spectra of LPU coatings (lignin pH 2, 20% PEG425) with and without TEA.

Wavenumber [cm−1] Peak location [cm−1] Assignment of absorption bands
3331 3350–3310 N–H stretching of secondary amines
2911 3000–2842 C–H stretch in methyl and methylene groups
2873 2880–2670 O–CH3 stretching
2279 2270 N Created by potrace 1.16, written by Peter Selinger 2001-2019 C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching
1703 1740–1690 C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching of carbonyl groups in urethanes
1597 1650–1550 Deformation of –NH or –NH2
1509 1515–1505 Aromatic skeleton vibrations of G-units
1412 1470–1400 C–H deformation of saturated hydrocarbons (–CH2 and –CH3)
1307 1330–1050 C–O stretching of esters
1225 1224 C–N stretching of urethane groups
1065 1330–1050 C–O stretching of esters
815 840–800 Benzene ring with 2 adjacent H-atoms: 1,4-disubstitution; 1,3,4-trisubstitution etc.