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Recycling without Fiber Degradation—Strong Paper Structures for 3D Forming Based on Nanostructurally Tailored Wood Holocellulose Fibers
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-08 , DOI: 10.1021/acssuschemeng.9b06176 Xuan Yang 1 , Lars A. Berglund 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-08 , DOI: 10.1021/acssuschemeng.9b06176 Xuan Yang 1 , Lars A. Berglund 1
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Cellulosic paper products based on sustainable resources are of interest as a replacement for petroleum-based plastics, for example, in packaging applications. Improvements are desired for mechanical performance, recyclability, and possibilities to shape fiber networks into complex geometries. Commercial bleached wood fibers from the kraft process have insufficient mechanical properties for many applications, even with beating and additives. In addition, mechanical properties of paper structures are significantly reduced after recycling. Here, recycling and 3D shaping performance of holocellulose fibers are compared with kraft fibers and investigated in the context of wood fiber tailoring for eco-friendly materials. Holocellulose fibers from wood are prepared by mild peracetic acid delignification for well-preserved nanostructures and hemicellulose content (28 wt %). Paper structures of about 50% porosity are prepared from both types of fibers by vacuum filtration and drying. Mechanical tensile tests are performed, and fracture surfaces are investigated. The effects of recycling on the fiber structure (chemical composition, morphology, and crystallite size in fibers) and mechanical paper properties are reported. 3D-shaping performance is studied using compression molding with a double-curved mold. Holocellulose paper structures showed much better mechanical properties than kraft fiber paper (Young’s modulus 10 GPa, ultimate tensile strength 100 MPa), as well as better recycling performance (only 26% decrease in strength after 5 cycles) and 3D formability. The well-preserved cellulose and hemicellulose components are important, as well as the homogeneity of the fiber cell wall nanostructure. This preserves the intrinsic mechanical properties of fibers, reduces hornification effects, and provides strong interfiber adhesion. Furthermore, the water-soluble hemicelluloses present at the cellulose–cellulose interface are able to facilitate recycling and 3D forming.
中文翻译：
回收而无纤维降解-基于纳米结构的木质纤维素纤维的3D成型坚固纸结构
基于可持续资源的纤维素纸产品作为石油基塑料的替代品（例如在包装应用中）备受关注。需要改善机械性能，可回收性以及将纤维网络成形为复杂几何形状的可能性。来自牛皮纸工艺的商用漂白木纤维即使在打浆和添加添加剂的情况下，也无法满足许多应用的机械性能要求。另外，回收后纸结构的机械性能显着降低。在这里，将全纤维素纤维与牛皮纸纤维的回收利用和3D成型性能进行了比较，并在为环保材料定制木纤维的情况下进行了研究。木材中的纤维素纤维是通过温和的过乙酸去木质素作用制备的，用于保存良好的纳米结构和半纤维素含量（28 wt％）。由两种类型的纤维通过真空过滤和干燥制备孔隙率约50％的纸结构。进行机械拉伸试验，并研究断裂表面。报告了回收对纤维结构（化学成分，形态和纤维中微晶尺寸）和机械纸性能的影响。使用具有双曲线模具的压缩成型技术研究3D成型性能。相比纤维素纤维纸（杨氏模量10 GPa，极限抗拉强度100 MPa），全纤维素纸结构具有更好的机械性能，以及更好的循环利用性能（5个循环后强度仅降低26％）和3D成形性。保存完好的纤维素和半纤维素成分以及纤维细胞壁纳米结构的均质性很重要。这保留了纤维的固有机械性能，减少了角化效应，并提供了强大的纤维间粘合力。此外，存在于纤维素-纤维素界面的水溶性半纤维素能够促进回收和3D成型。
更新日期：2020-01-08
中文翻译：
回收而无纤维降解-基于纳米结构的木质纤维素纤维的3D成型坚固纸结构
基于可持续资源的纤维素纸产品作为石油基塑料的替代品（例如在包装应用中）备受关注。需要改善机械性能，可回收性以及将纤维网络成形为复杂几何形状的可能性。来自牛皮纸工艺的商用漂白木纤维即使在打浆和添加添加剂的情况下，也无法满足许多应用的机械性能要求。另外，回收后纸结构的机械性能显着降低。在这里，将全纤维素纤维与牛皮纸纤维的回收利用和3D成型性能进行了比较，并在为环保材料定制木纤维的情况下进行了研究。木材中的纤维素纤维是通过温和的过乙酸去木质素作用制备的，用于保存良好的纳米结构和半纤维素含量（28 wt％）。由两种类型的纤维通过真空过滤和干燥制备孔隙率约50％的纸结构。进行机械拉伸试验，并研究断裂表面。报告了回收对纤维结构（化学成分，形态和纤维中微晶尺寸）和机械纸性能的影响。使用具有双曲线模具的压缩成型技术研究3D成型性能。相比纤维素纤维纸（杨氏模量10 GPa，极限抗拉强度100 MPa），全纤维素纸结构具有更好的机械性能，以及更好的循环利用性能（5个循环后强度仅降低26％）和3D成形性。保存完好的纤维素和半纤维素成分以及纤维细胞壁纳米结构的均质性很重要。这保留了纤维的固有机械性能，减少了角化效应，并提供了强大的纤维间粘合力。此外，存在于纤维素-纤维素界面的水溶性半纤维素能够促进回收和3D成型。
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