Sample

N-H

H-bonding

C=O_{urethane-H bonding}

(1701 cm⁻¹)

C=O_{free urethane}

(1728 cm⁻¹)

C-O-C

H-bonding

TPU-1

100

87.4

12.6

12.6

TPU-2

100

87.0

13.0

13.0

TPU-3

100

85.5

14.5

14.5

TPU-4

100

82.7

17.8

17.8

TPU-5

100

80.0

20.0

20.0