Effects of orientation and degree of polymerization on tensile properties in the cellulose sheets using hierarchical structure of wood
Effects of orientation and degree of polymerization on tensile properties in the cellulose sheets using hierarchical structure of wood
复制标题
取向和聚合度对使用木材分层结构的纤维素片材拉伸性能的影响
DOI：
10.1007/s10570-021-04160-7
复制
发表时间：
2021
期刊：
影响因子：
5.7
通讯作者：
Horikawa Y
中科院分区：
文献类型：
--
作者：
Kurei T.;Hioki Y.;Kose R.;Nakaba S.;Funada R.;Horikawa Y
摘要结构控制对于纤维素材料的进一步开发至关重要。在这里，我们使用基于木材分层结构的片材证明了纤维素微原纤集成结构中的取向和聚合度的重要性。通过两步化学处理，从针叶树木块中去除非纤维素成分。部分改变处理条件生成具有不同聚合度的纤维素块，同时保持解剖结构。随后通过热压块来制备具有定向微纤维的纤维素片。还通过拆卸管胞排列来生产具有随机外观方向的片材。然后对这些片材进行结构评估和拉伸测试。两种片材的比较表明，微纤维取向主要决定模量。只要保持取向，比模量就与聚合度无关。相反，定向片材的拉伸强度随聚合度的变化而变化，表明与随机取向片材相比，它显着地反映了单纤维强度。因此，具有未破碎的微纤维的高度定向结构是优质材料的决定因素。因此，易于控制这些参数的片材可以促进纤维素的应用。图形摘要
AbstractStructural control is essential for further development of cellulosic materials. Here, we demonstrated the significance of the orientation and degree of polymerization in the integrated structure of cellulose microfibrils using sheets based on the hierarchical structure of wood. Non-cellulosic components were removed from wood blocks of a conifer by applying a two-step chemical treatment. Partially changing the treatment conditions generated cellulose blocks with varying degrees of polymerization while maintaining the anatomical structure. Cellulose sheets with oriented microfibrils were subsequently prepared by heat-pressing the blocks. Sheets with randomized appearance of orientation were also produced by disassembling tracheid alignment. These sheets were then subjected to structural evaluation and tensile tests. Comparison of both sheets showed that microfibril orientation mainly determined the modulus. As long as the orientation was maintained, the specific modulus was independent of the degree of polymerization. In contrast, the tensile strength of the oriented sheet varied with the degree of polymerization, indicating that it notably reflected the single fiber strength compared to the randomly oriented sheet. Hence, a highly oriented structure with unfragmented microfibrils is the determinant of a superior material. Consequently, the sheets in which these parameters are readily controlled can advance cellulose applications.Graphic abstract
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2007
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1982
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