SYNTHESIS AND CHARACTERIZATION OF HEMICELLULOSIC DERIVATIVES WITH NOVEL BIFUNCTIONAL GROUPS IN BUTANOL MEDIUM
Novel Hemicellulosic derivatives with bifunctional groups were synthesized by the etherification using acrylamide as reactant and sodium hydroxide as catalyst in a butanol/water system. The factors such as the volume ratio of butanol to water, the molar ratio of catalyst to xylose unit in hemicelluloses, and the molar ratio of acrylamide to xylose unit in hemicelluloses were investigated in detail. It was found that the total degree of substituent (DS) of the derivatives increased with the increment of the molar ratio of acrylamide to xylose unit in hemicelluloses, and the DS of carbamoylethyl groups increased with the increasing of the total DS values of the products. The novel hemicellulosic derivatives containing carbamoylethyl and carboxyethyl groups could be confirmed by FT-IR, 1H-NMR and 13C-NMR spectroscopies. The thermal behavior of hemicellulosic derivatives was determined by thermogravimetry (TG) and differential thermal analysis (DTA). The results indicated that the thermal stability of the novel hemicellulosic derivatives was lower than native hemicelluloses. This work provided a facile method for the synthesis of hemicelluloses derivatives with bifunctional groups and higher DS of 0.92.
hemicelluloses characterization NMR spectroscopy synthesis thermal stability
Peng Xinwen Ren Junli Sun Runcang
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,510640, China
国际会议
广州
英文
216-219
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）