Analysis and Characterization of Acetylated Sugarcane Bagasse Hemicelluloses

Author： Xu Fen

ISSN： 1023-666X

Source： International Journal of Polymer Analysis and Characterization, Vol.9, Iss.4, 2004-07, pp. : 229-244

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Acetylation of sugarcane bagasse hemicelluloses with acetic anhydride using N-bromosuccinimide (NBS) as a catalyst in N,N-dimethylformamide/lithium chloride system under mild conditions was comparatively studied. The yield and the degree of substitution (DS) ranged from 68.2% and 0.37 to 78.6% and 0.82 as a function of experiment conditions. It was found that the yield and DS increased with N-bromosuccinimide concentration between 0.5 and 1.0%, reaction temperature from 18 to 80°C, and reaction time between 2 and 4 h. In comparison, other catalysts such as H 2 SO 4 and four tertiary amine catalysts, pyridine, 4-dimethylaminopyridine, N-methyl pyrrolidine, and N-methyl pyrrolidinone, were also investigated. The results showed that NBS can be used as a novel and effective catalyst for acetylation of hemicelluloses under extremely mild reaction conditions. The new polymeric products were characterized by FT-IR, 13 C NMR spectroscopy, and thermal analysis. The thermal stability of the material was increased by chemical modification.