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Table 2 IR band positions recorded for Imron® FG1333, NCP H2OB and pure HDI polyisocyanurate resin (Bayhydur® 303 supplied by Bayer) and their assignment by referring to literature [2224]

From: Polyurethane coatings used in twentieth century outdoor painted sculptures. Part I: comparative study of various systems by means of ATR-FTIR spectroscopy

Imron® FG1333™ NCP® H2OB HDI isocyanurate Intensity Band assignment
3330 3330 3330 m Secondary urethane N=H stretch/NH bonded/N–H stretching vibration band
2930 2930 2936 m νa CH2
2860 2860 2856 m νs CH2
2270 2270 2263 m Isocyanate asymmetric N=C=O stretch/NCO out of phase
1765 1765 1765 w Free C=O stretch
1680 1680 1680 vs H bond C=O stretch/tertiary urethane C=O/C=O bonded
1630 1630 1627 m Carbonyl groups in urea bonds (C=O)
1565 1565 1574 m Secondary amide RCONHR′
1515 1515 1513 sh δ–NH and νa C–N
1455 1455 1455 vs δ–CH2
1425 1425 1425 s δ OH
1375 1375 1375 m δ–C(CH3)
1330 1330 1334 m NCO in phase/CH2
1250 1250 1248 m (O=)C–O–C stretch/Urethane C–O stretch
1155 1145 1155 w νa C–N–C
1091 1089 1090 w νa C–O–C
865 865 865 w νs C–N–C
765 765 765 s C–N skel str
730 730 730 m CH2 in phase rock
  1. νa asymmetric stretch, νs symmetric stretch, δ deformation