Mautner Andreas, Mayer Florian, Hervy Martin, Lee Koon-Yang, Bismarck Alexander
Polymer and Composite Engineering (PaCE) Group, Institute of Materials Chemistry and Research, Faculty of Chemistry, University of Vienna, 1090 Wien, Austria.
The Composite Centre, Department of Aeronautics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
Philos Trans A Math Phys Eng Sci. 2018 Feb 13;376(2112). doi: 10.1098/rsta.2017.0043.
Cellulose nanopapers have gained significant attention in recent years as large-scale reinforcement for high-loading cellulose nanocomposites, substrates for printed electronics and filter nanopapers for water treatment. The mechanical properties of nanopapers are of fundamental importance for all these applications. Cellulose nanopapers can simply be prepared by filtering a suspension of nanocellulose, followed by heat consolidation. It was already demonstrated that the mechanical properties of cellulose nanopapers can be tailored by the fineness of the fibrils used or by modifying nanocellulose fibrils for instance by polymer adsorption, but nanocellulose blends remain underexplored. In this work, we show that the mechanical and physical properties of cellulose nanopapers can be tuned by creating nanopapers from blends of various grades of nanocellulose, i.e. (mechanically refined) bacterial cellulose or cellulose nanofibrils extracted from never-dried bleached softwood pulp by chemical and mechanical pre-treatments. We found that nanopapers made from blends of two or three nanocellulose grades show synergistic effects resulting in improved stiffness, strength, ductility, toughness and physical properties.This article is part of a discussion meeting issue 'New horizons for cellulose nanotechnology'.
近年来，纤维素纳米纸作为高负载纤维素纳米复合材料的大规模增强材料、印刷电子产品的基材以及用于水处理的过滤纳米纸，受到了广泛关注。纳米纸的机械性能对于所有这些应用都至关重要。纤维素纳米纸可以通过过滤纳米纤维素悬浮液，然后进行热固结来简单制备。已经证明，纤维素纳米纸的机械性能可以通过所用原纤的细度或通过例如聚合物吸附来修饰纳米纤维素原纤来进行调整，但纳米纤维素共混物仍未得到充分探索。在这项工作中，我们表明，纤维素纳米纸的机械和物理性能可以通过由不同等级的纳米纤维素共混物制备纳米纸来调节，即（机械精制的）细菌纤维素或通过化学和机械预处理从未干燥的漂白软木浆中提取的纤维素纳米原纤。我们发现，由两种或三种纳米纤维素等级的共混物制成的纳米纸显示出协同效应，从而提高了刚度、强度、延展性、韧性和物理性能。本文是“纤维素纳米技术的新视野”讨论会议问题的一部分。
