Formation of Aromatic and Other Unsaturated End Groups in Carboxymethyl Cellulose During Hot Alkaline Treatment |
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Authors: | Anne Vikkula Jukka Valkama Tapani Vuorinen |
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Institution: | (1) Laboratory of Forest Products Chemistry, Helsinki University of Technology (HUT), P.O. Box 6300, FIN-02150 Espoo, Finland |
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Abstract: | Carboxymethyl cellulose (CMC, DS 0.58) was treated in solutions of sodium hydroxide (0.001–1 M) at 95 °C. The treated (1–12 h) CMC samples were purified by dialysis and analyzed by UV spectroscopy and by UV resonance Raman spectroscopy (UVRRS) with excitation at 244 nm. A UV absorption maximum at 265 nm and a UVRR signal at 1650 cm−1 were indicative of formation of -conjugated aldehyde end groups in CMC through -elimination. Another strong UVRR band at 1610 cm−1 gave evidence on conversion of some of the -conjugated aldehyde end groups to alkali stable aromatic structures. |
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Keywords: | 2-O-Alkyl substituted polysaccharide Alkaline degradation -hydroxy elimination" target="_blank">gif" alt="$$\beta$$" align="middle" border="0">-hydroxy elimination Carboxymethyl cellulose Reducing end group UV resonance Raman spectroscopy |
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