The physicochemical effect of sugar alcohol plasticisers on oxidised nanocellulose gels and extruded filaments
The physicochemical effect of sugar alcohol plasticisers on oxidised nanocellulose gels and extruded filaments
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DOI：
10.1007/s10570-021-03991-8
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发表时间：
2021-07-08
期刊：
影响因子：
5.7
通讯作者：
Eichhorn, Stephen J.
中科院分区：
文献类型：
--
作者：
Johns, Marcus A.;Nigmatullin, Rinat;Eichhorn, Stephen J.
氧化纳米纤维素在生产具有高拉伸强度性能的挤压长丝方面已经显示出前景。然而，它们也表现出较差的湿强度，因为浸泡在水中会膨胀。这导致使用化学交联剂，或与多价阳离子共挤出，或阳离子聚合物，以抑制这一点。在这里，我们报告了在挤压前将糖醇（甘油、山梨醇和麦芽糖醇）掺入氧化纳米纤维素凝胶中的效果。虽然它们的存在削弱了初始凝胶，但它们使长丝在水介质中稳定的连续湿纺而不需要后挤压加工。我们得出结论，糖醇的相对亲水性及其在干燥时使表面羧基质子化的能力是观察到的物理化学效应的关键参数。
Oxidised nanocelluloses have previously shown promise for the production of extruded filaments with high tensile strength properties. However, they also exhibit poor wet strength due to swelling upon immersion in water. This has resulted in the use of chemical cross-linkers, or co-extrusion with multivalent cations, or cationic polymers, to inhibit this. Here, we report on the effect of incorporating sugar alcohols (glycerol, sorbitol and maltitol) in an oxidised nanocellulose gel before extrusion. Whilst their presence weakens the initial gel, they enable the continuous wet spinning of filaments that are stable in aqueous media without the need for post extrusion processing. We conclude that the relative hydrophilicity of the sugar alcohol and its ability to protonate surface carboxyl groups upon drying are key parameters regarding the physicochemical effects observed.