Composition of ramie hemicelluloses and effect of polysaccharides on fiber properties
Composition of ramie hemicelluloses and effect of polysaccharides on fiber properties
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DOI：
10.1177/0040517515592811
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发表时间：
2016-03
影响因子：
2.3
通讯作者：
Zhengfan Li;Zhaoling Li;R. Ding;Chongwen Yu
中科院分区：
文献类型：
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作者：
Zhengfan Li;Zhaoling Li;R. Ding;Chongwen Yu
苎麻是一种重要的天然纤维，具有独特的特性和优良的性能。本研究对苎麻纤维中半纤维素的化学组成进行了深入的研究。系统研究了NaOH处理对半纤维素中多糖的影响以及多糖对纤维性能的影响。结果表明，苎麻半纤维素中的半乳葡甘露聚糖、葡甘露聚糖和木聚糖占总质量的79.0%。在1%（w/w）NaOH溶液中，半乳葡甘露聚糖比葡甘露聚糖更易溶解。在相同浓度的NaOH溶液中，木聚糖的溶解度最低。随着半乳葡甘露聚糖、葡甘露聚糖和木聚糖含量的增加，纤维线密度和未分离纤维率呈增加趋势，而纤维比强度呈下降趋势。此外，这三种组分的含量对苎麻纤维的摩擦系数、断裂伸长率、弹性模量和回弹性的影响不大。该研究可以为了解天然纤维中半纤维素和多糖的性质提供有用的信息，并从理论上指导苎麻纤维的脱胶过程。
Ramie, which is one of the most important natural fibers, possesses distinctive characteristics and excellent properties. In this study, the chemical compositions of hemicelluloses in ramie fibers were thoroughly investigated. The effect of NaOH treatment on polysaccharides in hemicelluloses and the effect of polysaccharides on fiber properties were systematically explored. It was found that the components of galactoglucomannan, glucomannan, and xylan accounted for about 79.0% of total weight in ramie hemicelluloses. Galactoglucomannan was more easily soluble than glucomannan in 1% (w/w) NaOH solution. Xylan possessed the lowest solubility in the same concentration of NaOH solution compared to the other two. Furthermore, with an increase of galactoglucomannan, glucomannan, and xylan contents, the fiber linear density and unseparated fiber percentage showed an increasing trend, while the fiber tenacity exhibited a decreasing trend under the same conditions. In addition, it was demonstrated that the contents of these three components have an insignificant effect on friction coefficient, breaking elongation, modulus, and resilience of ramie fibers. This study could provide useful information in understanding the nature of hemicelluloses and polysaccharides within natural fibers, as well as theoretically guiding the degumming process of ramie fibers.