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Table 3

FTIR spectrum values for unfilled PU foam.

Run # Peak (cm−1) Transmittance (%) Absorbance Assignment
1 3098.22 61.35 0.2122 O–H Stretching vibration
2 3095.11 48.20 0.3170 –C = C – stretching
3 3043.40 28.94 0.5385 H–NH stretching
4 2910.25 16.47 0.7833 O–H stretching
5 2834.02 48.11 0.3178 C–H stretching vibration of polyol
6 1942.61 85.73 0.0669 C = N stretching
7 1710.26 81.35 0.0896 S–H stretching
8 1608.71 52.41 0.2800 CH2 asymmetric variation
9 1498.37 20.03 0.6983 deformation CH2 + C&9552;C of the aromatic ring
10 1450.11 20.71 0.6838 C–H bending of unsaturated methylene groups.
11 1398.47 73.95 0.1311 S = O asymmetric Stretching
12 1099.20 73.04 0.1364 C–O–C asymmetric stretching
13 1050.22 64.39 0.1912 O–S–O stretching
14 926.34 72.16 0.1417 –CH bending vibration to substitute in alkenes ad aromatics
15 771.42 28.74 0.5415 –CH2 bending
16 708.15 4.10 0.3872 C = C aromatic stretching
17 528.73 60.41 0.2188 C–Cl stretching vibration

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