Characterization and properties of organo-montmorillonite modified lignocellulosic fibers and their interaction mechanisms
Characterization and properties of organo-montmorillonite modified lignocellulosic fibers and their interaction mechanisms
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DOI：
10.1039/c5ra12245g
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发表时间：
2015-09
期刊：
影响因子：
3.9
通讯作者：
Ru Liu;Yu Chen;Jinzhen Cao
中科院分区：
文献类型：
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作者：
Ru Liu;Yu Chen;Jinzhen Cao
采用有机蒙脱土（OMMT）两步法对从白杨粉（WF）中分离得到的纤维素纤维/粉（CF）、木质素粉（LF）以及代表半纤维素粉（HF）的木聚糖进行改性。研究了改性后材料的物理力学性能。此外，还研究了OMMT与这些纳米纤维的相互作用机理。结果表明，OMMT与HF部分插层，在LF中完全剥离。然而，它几乎没有渗透到CF中。OMMT的加入降低了HF和LF的水分含量，改善了它们的力学性能。但对于CF，OMMT对其物理/力学性能表现出负面/影响不大。未发现OMMT与CF发生反应。它主要通过与HF/LF分子链的羧基/酚羟基端基基本上形成连接而与NF的无定形组分反应。
In this study, lignocellulosic natural fibers (NFs), namely, cellulose fiber/flour (CF) and lignin flour (LF) separated from poplar wood flour (WF) as well as xylan as a representative of hemicellulose flour (HF), were modified with organo-montmorillonite (OMMT) through a two-step method. Some physical and mechanical properties of the thus-modified materials were investigated. Besides this, the interaction mechanisms between OMMT and these NFs were studied. The results showed that OMMT partly intercalated with HF and completely exfoliated in LF. However, it hardly penetrated into CF. Owing to that, OMMT reduced the moisture content of HF and LF and improved their mechanical properties. But for CF, OMMT showed negative/little effect on its physical/mechanical properties. No reaction was found between OMMT and CF. It mainly reacted with the amorphous constituents of the NFs by basically forming links with the carboxyl/phenolic hydroxyl end groups of the HF/LF molecular chains.