Chemical modification of cellulose-rich fibres to clarify the influence of the chemical structure on the physical and mechanical properties of cellulose fibres and thereof made sheets
Chemical modification of cellulose-rich fibres to clarify the influence of the chemical structure on the physical and mechanical properties of cellulose fibres and thereof made sheets
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DOI：
10.1016/j.carbpol.2017.11.006
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发表时间：
2018-02-15
影响因子：
11.2
通讯作者：
Wagberg, Lars
中科院分区：
文献类型：
--
作者：
Lopez Duran, Veronica;Larsson, Per A.;Wagberg, Lars
尽管早期使用了不同的化学方法来增加纤维基材料的延展性，但还不可能将化学改性与其机械性能联系起来。在这项研究中，纤维素纤维已被改性的高碘酸盐氧化，单独或随后的硼氢化物还原，还原胺化或过氧化氢氧化。此外，还研究了TEMPO氧化，以及克里思氧化与高碘酸盐氧化和进一步用硼氢化钠还原的组合。目的是了解不同官能团对由改性纤维制成的手抄纸的机械和结构性能的影响。结果发现，所研究的改性在不同程度上提高了纤维的拉伸强度，但只有高碘酸盐氧化，然后硼氢化物还原提供了更多的韧性纤维材料。密度、持水量和机械性能的变化也被量化，并且所有这些都取决于引入的官能团。
Despite the different chemical approaches used earlier to increase the ductility of fibre-based materials, it has not been possible to link the chemical modification to their mechanical performance. In this study, cellulose fibres have been modified by periodate oxidation, alone or followed either by borohydride reduction, reductive amination or chlorite oxidation. In addition, TEMPO oxidation, and TEMPO oxidation in combination with periodate oxidation and further reduction with sodium borohydride have also been studied. The objective was to gain understanding of the influence of different functional groups on the mechanical and structural properties of handsheets made from the modified fibres. It was found that the modifications studied improved the tensile strength of the fibres to different extents, but that only periodate oxidation followed by borohydride reduction provided more ductile fibre materials. Changes in density, water-holding capacity and mechanical performance were also quantified and all are dependent on the functional group introduced.