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Table 3 Characteristic FTIR features outlined for the 2KSBPU, 2KWBPU (based on PUDs), 1KWBPU and 2KFPU reference samples used in this study

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

2KSBPU

2KWBPU

1KWBPU

2KFPU

Attribution

2940–2930 (m)

2940–2930 (m)

2940–2930 (m)

2940–2930 (m)

Urethane

2860–2855 (m)

2860–2855 (m)

2860–2855 (m)

2860–2855 (m)

Urethane

1735–1720 (s)

abs.

1735–1720 (vs)

abs.

Polyester and/or acrylic polymer

1690–1680 (vs)

1690–1680 (vs)

abs.

1690–1680 (s)

HDI isocyanurate

1640–1630 (m)

1640–1630 (m)

1640–1630 (m)

1640–1630 (w)

Urethane

1575–1565 (m)

1575–1565 (m)

1575–1565 (m)

1575–1565 (w)

Urethane

1455–1450 (s)

1455–1450 (s)

abs.

1455–1450 (m)

HDI isocyanurate

abs.

abs.

abs.

1110 (vs)

Fluorinated polymer

abs.

abs.

abs.

1065 (vs)

Fluorinated polymer

765–760 (s)

765–760 (s)

abs.

765–760 (m)

HDI isocyanurate