Hierarchical porous structures in cellulose: NMR relaxometry approach

Hierarchical porous structures in cellulose: NMR relaxometry approach
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纤维素中的分层多孔结构:NMR 弛豫测量方法

DOI:
10.1016/j.polymer.2016.06.036
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发表时间:
2016-08
期刊:
影响因子:
4.6
通讯作者:
Liu Ruigang
Liu Ruigang
中科院分区:
化学2区
文献类型:
--
作者:
Zhang Chao;Li Pingping;Zhang Yijin;Lu Fei;Li Weiwei;Kang Hongliang;Xiang Jun-feng;Huang Yong;Liu Ruigang

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纤维素材料中的多级孔结构对纤维素材料的溶解、性能和应用具有重要意义。在不改变纤维素材料原始状态的情况下表征纤维素材料中分级多孔结构的方法仍然有限。在这项工作中,我们引入了核磁共振(NMR)弛豫测量法来表征棉纤维中的分级多孔结构,而在样品制备过程中不改变其结构。用该方法表征了棉样中孔隙结构的变化。结果表明,将纤维素浸泡在水中或在N,N-二甲基乙酰胺中高温蒸煮,可有效地提高纤维素样品对溶剂分子的可及性,扩大纤维素的无定形区。该方法可用于纤维素材料分级孔结构的评价,无需额外的改性信息,有助于纤维素在各个领域的利用。
Hierarchical porous structures in cellulose materials are important for the dissolution, properties and applications of cellulose materials. Methods for characterizing the hierarchical porous structures in cellulose materials without changing its original state are still limited. In this work, we introduced nuclear magnetic resonance (NMR) relaxometry for characterizing the hierarchical porous structures in cotton fibers without modifying their structure during sample preparation. By this method, the changes of the porous structures in cotton samples were characterized. It was found that soaking cellulose in water and stewing cellulose inN,N-dimethylacetamide at high temperature could efficiently improve the accessibility of cellulose samples to the solvent molecules and expand the Amorphous Region in cellulose. The method provided in this work can be used for the evaluation of the hierarchical porous structures of cellulose materials without additional modified information, which is helpful to the utilization of cellulose in various fields.
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