MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China.
Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
Carbohydr Polym. 2022 Nov 15;296:119926. doi: 10.1016/j.carbpol.2022.119926. Epub 2022 Jul 28.
Bamboo cellulose fibers (BCFs) has attracted increasing attention in many fields due to its high mechanical strength and interconnected porous structure. Drying is a key factor that determines the final structure and properties of BCFs. In this work, three kinds of BCFs, i.e., conventional-dried (CD-BCFs), freeze-dried (FD-BCFs), and supercritical CO-dried (SD-BCFs), were prepared via different drying methods. The effects of drying methods on their supramolecular structure, porosity, and mechanical properties were studied, and the structure-property relationships were proposed. The CD-BCFs composed of well-aligned crystalline nanofibrils with a dense structure exhibited the best mechanical properties (tensile strength of 854.54 MPa). The SD-BCFs featured with interconnected 3D microfibril networks give a highly porous structure and the highest surface area of 9.162 m/g. The FD-BCFs showed medium mechanical properties and surface area owing to the stacked lamellar microfibril network. This work provides guidelines for designing BCFs with proper structure for various end-use applications.
竹纤维素纤维（BCF）因其高强度和相互连通的多孔结构在许多领域受到越来越多的关注。干燥是决定 BCF 最终结构和性能的关键因素。在这项工作中，通过不同的干燥方法制备了三种 BCF，即常规干燥（CD-BCF）、冷冻干燥（FD-BCF）和超临界 CO2 干燥（SD-BCF）。研究了干燥方法对其超分子结构、孔隙率和力学性能的影响，并提出了结构-性能关系。由排列整齐的结晶纳米原纤维组成、结构致密的 CD-BCF 表现出最佳的力学性能（拉伸强度为 854.54 MPa）。具有相互连接的 3D 微纤维网络的 SD-BCF 具有高度多孔的结构和 9.162 m/g 的最高比表面积。由于层叠的片状微纤维网络，FD-BCF 表现出中等的力学性能和比表面积。这项工作为设计具有适当结构的 BCF 以满足各种最终用途应用提供了指导。
