Acetylation of sugarcane bagasse hemicelluloses under mild reaction conditions by using NBS as a catalyst

✍ Scribed by Xaio-Feng Sun; Run-Cang Sun; Li Zhao; Jing-Xia Sun

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 141 KB
• Volume: 92
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.13636

✦ Synopsis

Abstract

Sugarcane bagasse hemicelluloses were partially acetylated with acetic anhydride using N‐bromosuccinimide (NBS) as a catalyst under mild conditions in an almost solvent‐free system. The overall yield and degree of substitution (DS) were varied from 66.2 and 83.5% and between 0.27 and 1.15, respectively, by changing the reaction temperature and duration. It was found that the yield and DS increased with reaction temperature from 18 to 80°C and reaction time between 0.5 and 5.0 h. The results showed that treatment of the native hemicelluloses with acetic anhydride using NBS as a catalyst conveniently provided the corresponding biopolymer esters. The products were characterized by FTIR, ^13^C‐NMR spectroscopy, and thermal analysis. The new biopolymer acetates were thermally stable to over 200°C but underwent significant and rapid thermal degradation when heated above the onset of thermal degradation. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 53–61, 2004