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林业科学 ›› 2010, Vol. 46 ›› Issue (12): 119-124.doi: 10.11707/j.1001-7488.20101220

• 论文 • 上一篇    下一篇

碱性H2O2法分离常春油麻藤纤维素级分的结构特性

谢涛, 张儒   

  1. 湖南工程学院化学化工学院 湘潭 411104
  • 收稿日期:2009-08-17 修回日期:2009-10-01 出版日期:2010-12-25 发布日期:2010-12-25

Structural Characterization of Mucuna sempervirens Cellulose Fractions Isolated by Alkaline Hydrogen Peroxide

Xie Tao, Zhang Ru   

  1. College of Chemical Engineering, Hunan Institute of Engineering Xiangtan 411104
  • Received:2009-08-17 Revised:2009-10-01 Online:2010-12-25 Published:2010-12-25

摘要:

研究碱性H2O2法分级分离常春油麻藤纤维所得4种纤维素级分的结构特性。随着分离级数增加,纤维素分子链发生断裂的程度加剧,重均分子质量逐渐减小。第1级、2级、3级和4级纤维素属于纤维素Ⅰ,除1级纤维素中含有少量的木质素和半纤维素成分外,其余3种高纯度纤维素中基本不含木质素和半纤维素。经分级分离后,从第1级到4级纤维素的物理结构发生了很大的变化,使纤维束由最初的长粗变得更短更细。从第1级到4级纤维素的结晶度依次升高,但1级纤维素的结晶度相对要低得多。

关键词: 常春油麻藤, 纤维素, 分级分离, 结构特性

Abstract:

Structural characterizations of four cellulose fractions isolated by alkaline hydrogen peroxide from defatting Mucuna sempervirens fiber were studied. With the increasing of fractional grade, weight-average molecular weight gradually decreased owing to the increase in splitting degree of cellulose molecular chain. Four cellulose fractions belong to cellulose Ⅰ. Except that there contained a little lignin and hemicellulose in the first fractional cellulose because there obviously appeared the absorbance spectra relative to lignin and hemicellulose in the FTIR pictures. However, there didn’t nearly contained lignin and hemicellulose in the second, third and fourth fractional cellulose because their purities were high above 97.0%. After fractionating, there happened some great changes for the structure of four cellulose fractions. That is, cellulose bundles became much shorter and much thinner from the first fractional cellulose to the fourth fractional cellulose. The crystalline degree of the first, second, third and fourth fractional cellulose increased in proper order, while the crystalline degree of first fractional cellulose was much lower.

Key words: Mucuna sempervirens, cellulose, fractional isolation, structural characteristic

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