Porous all-cellulose composites were prepared from pulps dissolved in 8 wt-% NaOH-water and dispersed softwood kraft fibers. Freeze-drying and drying with supercritical CO₂ were used to vary the morphology of the composites. As cellulose dissolution in NaOH-water is known to be limited by pulp degree of polymerization, the latter was varied to obtain different amounts of non-dissolved fractions in solution. The goal of the work was to understand the influence of fibers originating from the incomplete dissolution and/or from added kraft fibers on the morphology and properties of porous all-cellulose composites. Density, porosity, pore volume, specific surface area and mechanical properties under compression were determined and correlated with the composite formulations and morphology.

由溶解在8 wt％NaOH水中的纸浆和分散的软木牛皮纸纤维制备多孔全纤维素复合材料。冷冻干燥和超临界CO ₂干燥用于改变复合材料的形态。由于已知纤维素在NaOH水中的溶解受到纸浆聚合度的限制，因此改变纸浆的聚合度以获得溶液中不同量的非溶解级分。这项工作的目的是了解不完全溶解和/或添加的牛皮纸纤维对多孔全纤维素复合材料的形态和性能的影响。测定密度，孔隙率，孔体积，比表面积和压缩下的机械性能，并将其与复合制剂和形态相关联。