Effect of carboxymethylated cellulose nanofibril concentration regime upon material forming on mechanical properties in films and filaments
Effect of carboxymethylated cellulose nanofibril concentration regime upon material forming on mechanical properties in films and filaments
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DOI：
10.1007/s10570-020-03566-z
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发表时间：
2020-11-16
期刊：
影响因子：
5.7
通讯作者：
Hakansson, Karl M. O.
中科院分区：
文献类型：
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作者：
Hakansson, Karl M. O.
据预测，森林和森林材料将发挥重要作用，使我们从线性的现在向循环和可持续的未来转变。因此，有必要了解可以从森林中提取的材料以及如何有效地使用它们。在这里，来自森林的羧甲基化纤维素纳米纤维 (CNF) 用于生产薄膜和长丝，目的是在宏观材料中保留单个 CNF 令人印象深刻的机械性能。当起始悬浮液处于流动状态时，薄膜（拉伸强度为 231 MPa）和长丝（拉伸强度为 645 MPa）的机械性能被证明达到最大。这是关于 CNF 长丝纺丝的新见解，本文认为，影响长丝机械性能的三个主要因素是（1）从悬浮液中生产自支撑长丝的可能性，（2）长丝内部的 CNF 排列以及（3）起始悬浮液的空间均匀性。这项研究的结果也可能适用于其他纳米材料，例如碳纳米管和丝蛋白原纤维，预计这些材料将在未来的高性能应用中发挥重要作用。[图表]。
It is predicted that the forest and materials from the forest will play an important role to enable the transformation from our linear present to a circular and sustainable future. Therefore, there is a need to understand the materials that can be extracted from the forest, and how to use them in an efficient manner. Here, carboxymethylated cellulose nanofibrils (CNF) from the forest are used to produce films and filaments with the aim to preserve the impressive mechanical properties of a single CNF in a macro-scale material. The mechanical properties of both the films (tensile strength of 231 MPa) and filaments (tensile strength of 645 MPa) are demonstrated to be maximized when the starting suspension is in a flowing state. This is a new insight with regards to filament spinning of CNF, and it is here argued that the three main factors contributing to the mechanical properties of the filaments are (1) the possibility to produce a self-supporting filament from a suspension, (2) the CNF alignment inside the filament and (3) the spatial homogeneity of the starting suspension. The results in this study could possibly also apply to other nanomaterials such as carbon nanotubes and silk protein fibrils, which are predicted to play a large part in future high performing applications.[GRAPHICS].