Table 2.
FT-IR characteristic absorption peaks of modified acrylic fibers, RB19, and modified acrylic fabrics dyed with RB19.
| Peak assignment | Wavenumber (cm−1) | ||
|---|---|---|---|
| Modified acrylic fibers | RB19 | Modified acrylic fibers dyed with RB19 | |
| N–O stretching, amidoxime | 947 | — | 930 |
| C=N stretching, amidoxime | 1594 | — | 1575 |
| OH and NH2 stretching, amidoxime | 3150–3550, broad | — | Present with less intensity |
| CN stretching, nitrile | 2243 | — | 2243 |
| S=O stretching, suffonic group | — | 1040, 1140, 1228 | Present overlapped with less intensity at 1228 |
| C=O, C=C, conjugated carbonyl with aromatic | — | 1500–1670 | Present overlapped with less intensity at 1659 |