State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China.
Biomacromolecules. 2010 Dec 13;11(12):3519-24. doi: 10.1021/bm1010118. Epub 2010 Nov 5.
Generation of bioenergy, new functional polymers, or chemicals and biomaterials from hemicelluloses are important uses for biomass. In this paper, a novel functional biopolymer with carbon-carbon double bond and carboxyl groups was prepared by a homogeneous esterification of xylan-rich hemicelluloses (XH) with maleic anhydride in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) ionic liquid using LiOH as catalyst. The biopolymers with degrees of substitution (DS) between 0.095 and 0.75 were accessible in a completely homogeneous system by changing reaction temperature, reaction time, the dosage of catalyst, and the molar ratio of maleic anhydride to anhydroxylose unit in XH. Results obtained from FT-IR and (13)C NMR spectroscopies confirmed the structure of hemicellulosic derivatives with carbon-carbon double bond and carboxyl groups, implying an efficient method to prepare a novel and important functional biopolymer for biomaterials.
从半纤维素生成生物能源、新型功能聚合物或化学品和生物材料是生物质的重要用途。本文在 1-丁基-3-甲基咪唑氯盐([BMIM]Cl)离子液体中，用 LiOH 作催化剂，通过马来酸酐与富含木聚糖的半纤维素(XH)的均相酯化反应，制备了一种具有碳-碳双键和羧基的新型功能生物聚合物。通过改变反应温度、反应时间、催化剂用量和马来酸酐与 XH 中脱水葡萄糖单元的摩尔比，可以在完全均相体系中获得取代度(DS)在 0.095 到 0.75 之间的生物聚合物。FT-IR 和(13)C NMR 光谱的结果证实了具有碳-碳双键和羧基的半纤维素衍生物的结构，这意味着可以采用一种有效方法来制备新型的、重要的功能生物聚合物，用作生物材料。
