Changes in H-Bonding of cellulose during solvent purification treatment (Acetonation)

摘要

In this study, acetone was used at the solvent of purification due to the fact that acetone has the ability to penetrate into the cellulosic material and bring about considerable stereochemical changes. At the same time, acetone is classified as a dipolar aprotic hydrophilic solvent, i.e., hydrogen bond acceptor (HBA), (Frey-Wyssling 1953; Bax et al. 1972; Isaacs 1974). The changes caused in hydrogen bonding of the cellulose by acetone were irreversible. The increase of acetone concentration was found to be associated with a significant systematic increase in absorbance height of OH stretching, i.e., provision of weak hydrogen H-bond. In other words, the accessibility of cellulose was progessively increased with the increase of acetone concentration.