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 \(\alpha,\beta\)-conjugated aldehyde end groups in CMC through \(\beta\)-elimination. Another strong UVRR band at 1610 cm−1 gave evidence on conversion of some of the \(\alpha,\beta\)-conjugated aldehyde end groups to alkali stable aromatic structures.
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