Research Article
Mixture Design Approach on the Physical Properties of Lignin-Resorcinol-Formaldehyde Xerogels
Table 7
Position and attribution of the IR absorption bands for lignin and xerogels.
| | Wavenumber (cm1) | Band attribution |
| | 3412–3012 | (OH) | | 2850–3006 | (CH2) | | 2850 | (CH2) in aromatic methoxy groups | | 1710 | (C=O) not conjugated | | 1670 | (C=O) conjugated ketones | | 1594–1613 | (C=C) aromatic rings | | 1510 | (C=C) aromatic rings | | 1460 | (CH2) and (CH3) | | 1420 | (scissors) (CH2) and (CH3) | | 1375 | (CH3) | | 1330 | (CH2) and (O–H) | | 1262 | (C–O) | | 1220 | (C–O) | | 1080 | (C–O) in secondary alcohols and aliphatic ethers | | 1034 | (C–O–C) | | 810–902 | (C–H) out of plane of aromatic rings and (C–C) in rings |
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: stretch; : deformation; : rocking; sy: symmetrical; as: asymmetrical; s: shoulder; l: exclusive peak for lignin; x: exclusive peak for xerogels.
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