Multifunktionale zellulosebasierte Fasern, Grenzschichten und Verbundwerkstoffe

纤维素基纤维被广泛用作聚合物基复合材料的增强材料。本研究计划的主要课题是通过将多壁碳纳米管（MWNTs）“限制”在纤维和基体之间的界面中，来开发高性能和多功能的纤维素基纤维增强聚合物复合材料。为了达到这一目标，最具挑战性的任务是调整MWNTs在纤维表面的分布。主要包括三个部分：1)利用不同的表面活性剂和水溶性纤维素制备具有良好稳定性/分散性和明确表面电荷的MWNT水分散体。2)用MWNT水分散体对纤维素基纤维进行表面改性，生成多功能纤维素基纤维，进而生成多功能纤维素基纤维增强聚合物复合材料。3)利用基于原子力显微镜（AFM）的弹性/电/热成像技术（力体积纳米压痕、电显微镜、微/纳米热分析）表征界面相物理和力学性能的纳米级特征，以确定界面相性能与复合材料性能之间的相互作用。

Cellulose based fibres are being widely used as reinforcement for polymer based composites. The main subject of this research proposal is to develop high performance and multifunctional cellulose based fibre reinforced polymer composites by incorporating multi-walled carbon nanotubes (MWNTs) “confined” in the interphase between fibre and matrix. To reach this target, the most challenging task is to tailor the distribution of MWNTs on fibre surfaces. The work mainly comprises three parts: 1) Preparation of MWNT aqueous dispersions with good stability/dispersibility and defined surface charge with the aid of different surfactants and water soluble celluloses. 2) Surface modification of cellulose based fibres with MWNT aqueous dispersions to generate multifunctional cellulose based fibres and in turn, multifunctional cellulose based fibre reinforced polymer composites. 3) Characterization of nanoscale profiles of physical and mechanical properties of interphase using Atomic Force Microscopy (AFM) based elasticity/electricity/thermal mapping techniques (force volume nanoindentation, electric force microscopy, mircro-/nano-thermal analysis), in order to identify the interactions between interphase properties and composite properties.