Multi-Scale Characterisation of Interactions between Cellulose Interfaces and Polymers

纤维素界面与聚合物之间相互作用的多尺度表征

• 批准号: 405629430
• 负责人: Professorin Dr. Regine von Klitzing
• 金额: --
• 依托单位: Arbeitsgruppe Weiche Materie an Grenzflächen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/405629430?language=en
• 关键词: Multi; Scale; Characterisation; Interactions; between

The aim of the sub-project is a better understanding and better control of the binding of polymers to paper fibres. An important research approach of the package application is to functionalise papers with the help of polymers and thus impart new or improved properties to them, such as increased wet tensile strength and better transport properties. The challenge is to achieve a long-term stable bonding of the polymers to the paper via chemisorption or physisorption while maintaining the swelling capacity. In order to better understand and control the immobilisation of different polymer systems at the interface of the paper fibre and the influence on the properties of paper, precise investigations on smaller length scales are particularly necessary. In the present project, the adhesion-mediating function of polymers is investigated on different small length scales (nm - some µm). Since many methods (ellipsometry, AFM, reflectometry) for interface characterisation require a planar interface, water-stable planar model surfaces of cellulose, which chemically imitate a paper fibre surface, were prepared in the first funding period. In the second funding period, the focus will be placed even more strongly on different roughness and topography differences (pores, oriented structuring) of the model surface in order to simulate different surface structures of fibres. For this purpose, thin films of microcrystalline cellulose (MCC), cellulose fibres (nanofibrillated cellulose, NFC) and trimethylsilyl cellulose (TMSC) will be produced on planar substrates. Furthermore, the relationship between the structure, swelling behaviour and mechanical properties of polymers and cellulose surface will be understood. In addition to swellability in water, swelling in ionic liquids is also investigated (C1). In a next step, polymer accumulation at the fibre crossing points and its effect on the mechanical behaviour of the fibre crossing points is to be better understood (B1, B3). For this purpose, the model system is extended by adsorbing a paper fibre (diameter: a few µm) onto the cellulose surface and investigating the polymer adsorption in the vicinity of the paper fibre by means of atomic force microscopy. In this context, the influence of the orientation of the paper fibres on the polymer binding with simultaneous mobility of the polymers shall be understood and controlled.In addition to the polymers from A3, the polymer microgel particles produced in our research group will be used. The soft microgel particles are strongly adhesive and therefore have a fibre-bonding effect. These microgels react to external stimuli such as temperature and pH value and are to be used in the long term to build up papers with sensor properties. In addition to polymers, the binding of peptides is also to be investigated with C2.

该分项目的目的是更好地了解和更好地控制聚合物与纸纤维的结合。包装应用的一个重要研究方法是在聚合物的帮助下使纸张功能化，从而赋予它们新的或改进的性能，例如增加的湿拉伸强度和更好的运输性能。挑战在于通过化学吸附或物理吸附实现聚合物与纸的长期稳定结合，同时保持溶胀能力。为了更好地了解和控制不同聚合物体系在纸纤维界面的固定以及对纸性能的影响，特别需要对较小长度尺度进行精确的研究。在本项目中，聚合物的粘附介导功能在不同的小长度尺度（nm -一些μm）上进行了研究。由于许多方法（椭圆偏振法，原子力显微镜，反射法）的界面特性需要一个平面的界面，水稳定的平面模型表面的纤维素，化学模拟纸纤维表面，在第一个资金周期。在第二个资助期内，将更加关注模型表面的不同粗糙度和形貌差异（孔隙，定向结构），以模拟纤维的不同表面结构。为此，将在平面基材上制备微晶纤维素（MCC）、纤维素纤维（纳米原纤化纤维素，NFC）和三甲基甲硅烷基纤维素（TMSC）的薄膜。此外，聚合物和纤维素表面的结构，溶胀行为和机械性能之间的关系将得到理解。除了在水中的溶胀性之外，还研究了在离子液体中的溶胀（C1）。在下一步中，将更好地理解纤维交叉点处的聚合物积聚及其对纤维交叉点的机械性能的影响（B1，B3）。为此，模型系统通过将纸纤维（直径：几微米）吸附到纤维素表面上并通过原子力显微镜研究纸纤维附近的聚合物吸附来扩展。在这种情况下，纸纤维的取向对聚合物结合的影响，同时聚合物的流动性应得到理解和控制。除了来自A3的聚合物，我们的研究小组生产的聚合物微凝胶颗粒将被使用。软微凝胶颗粒具有强粘合性，因此具有纤维粘合效果。这些微凝胶会对外界刺激（如温度和pH值）产生反应，并将长期用于构建具有传感器特性的纸张。除聚合物外，还将用C2研究肽的结合。