Pseudomorphic Conversion of Cellulose-based Paper to Functionalized Ceramic Papers

纤维素纸向功能化陶瓷纸的赝形转化

• 批准号: 411442613
• 负责人: Professor Dr. Hans-Joachim Kleebe
• 金额: --
• 依托单位: Institut für Angewandte Geowissenschaften (IAG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/411442613?language=en
• 关键词: Pseudomorphic; Conversion; Cellulose; based; Paper

Within the applied project, the pore space of cellulose-based paper materials is used for in-situ production of functional ceramic papers with hierarchical porosity and morphology. One of the main objectives is the pseudomorphic conversion of morphological and topological features of pulp-based paper to ceramic systems by utilization of suitable polymer-based single-source precursors (SSPs). In addition, the morphology of the cellulose paper should be equipped with in-situ grown 1D nanostructures affecting the properties of the ceramic paper such as pore structure, high temperature stability, or flexibility. For the production of ceramic papers, pulp papers are first surface-modified via condensation reactions with metal-containing preceramic polymers and, in a further thermal step, are converted into ceramic papers (perimorphoses), having a hierarchical multiscale porosity and morphology. In this case, preferentially metal-modified SiOC, Si(C)N-based ceramic papers are produced, which provide hierarchical macro/meso porosities at conversion temperatures of 700–900 °C. The modification with suitable metal-containing polymers leads to local precipitation of metal or metal silicide nanoparticles within the polymer matrix. Ceramization at higher temperatures (i.e., between 1100–1500° C) results in the in-situ formation of SiC or Si3N4-based 1D nanostructures containing functional metal or metal silicide tips (such as Fe, Ni, Ti, Fe3Si). Here, questions concerning the surface functionalization of pulp paper and the effects of the hierarchical paper pore space on the ceramization behavior of the SSPs are of great importance.In addition to the preparation of the ceramic papers, the 1D nanostructures produced in the pore space are characterized in detail by electron-optical methods. The central question here is how the microstructure, the phase structure and the topology of the ceramic papers and the functional 1D nanofibers are obtained after successful pseudomorphic transformation. Therefore, detailed material characterization is performed from the micrometer (SEM) to the nanometer scale (TEM). The overall goal is to obtain an understanding of the paper morphology across scales as well as about the resulting intrinsic nanostructures in order to generate tailored property profiles. Another important aspect is the question to what extent the intrinsic structure of the individual paper fiber is maintained (perimorphose), or what type of porosity and phase assemblage is present upon conversion within the original fiber filament. Furthermore, the question should be considered to what extent a mechanical flexibility of the produced ceramic papers can be achieved.

在应用项目中，基于纤维素的纸质材料的孔隙空间用于现场生产具有分层孔隙和形态的功能性陶瓷纸。主要对象之一是通过利用合适的基于聚合物的单源前体（SSP），将基于纸浆的纸张形态和拓扑特征与陶瓷系统的形态和拓扑特征的伪形转换。另外，纤维素纸的形态应等于影响陶瓷纸（例如孔结构，高温稳定性或柔韧性）的原位生长的1D纳米结构。为了生产陶瓷纸，首先通过与金属含有金属精确聚合物的凝结反应进行表面修饰，并在进一步的热步骤中转化为陶瓷纸（圆锥形），具有层次的多尺度孔隙率和形态。在这种情况下，生产基于金属改性的Si（C）N基陶瓷纸，在转化温度为700–900°C时提供层次的宏观/中间孔隙率。使用合适的含金属聚合物的修饰导致聚合物基质中金属或金属硅酸盐纳米颗粒的局部沉淀。较高温度下的陶瓷（即1100–1500°C之间）导致基于SIC或SI3N4基的原位形成，这些基于功能性金属或金属硅酸盐尖端（例如FE，Ni，Ni，Ti，Fe3SI）。在这里，有关纸浆纸表面功能化以及分层纸孔空间对SSP仪式行为的影响非常重要的问题非常重要。除了制备陶瓷纸，孔隙空间中产生的一维纳米结构还通过电子操作方法来详细表征。这里的中心问题是如何在成功的假形态转化后获得陶瓷论文的相结构和拓扑结构和功能性1D纳米纤维。因此，从千分尺（SEM）到纳米尺度（TEM）进行详细的材料表征。总体目标是了解跨尺度以及所得的内在纳米结构的理解，以生成量身定制的特性概况。另一个重要方面是问题在多大程度上保持单个纸纤维的固有结构（圆锥形），或者在原始纤维丝中转化时呈现了哪种类型的孔隙度和相组合。此外，应该考虑到在多大程度上可以考虑产生的陶瓷论文的机械灵活性。