由nbnmo稳定Lyocell Dopes制备的超轻质纤维素气凝胶

4区材料科学 Q2 Engineering

Advances in Materials Science and Engineering Pub Date : 2007-10-29 DOI:10.1155/2007/73724

F. Liebner, A. Potthast, T. Rosenau, E. Haimer, M. Wendland

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引用次数: 29

摘要

纤维素气凝胶是一种新型材料，它是对固体Lyocell模塑的溶剂交换得到的再生纤维素进行超临界干燥而制成的。从纤维素含量在1 - 12%之间的n -甲基morpholine- n -oxide溶液中产生尺寸稳定的纤维素体，其中纤维素的溶液结构在很大程度上被保留并转移到固体状态。所获得的气凝胶的比密度和表面分别在0.05至0.26 g/cm3和172至284 m2/g之间，这取决于Lyocell dopes的纤维素含量和再生程序。介绍了一种可靠的超临界二氧化碳萃取和干燥工艺，利用NBnMO作为Lyocell掺杂剂的稳定剂，以及材料的选定物理性质。

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Ultralight-Weight Cellulose Aerogels from NBnMO-Stabilized Lyocell Dopes

Cellulose aerogels are intriguing new materials produced by supercritical drying of regenerated cellulose obtained by solvent exchange of solid Lyocell moldings. From N-methylmorpholine-N-oxide solutions with cellulose contents between 1 and 12%, dimensionally stable cellulose bodies are produced, in which the solution structure of the cellulose is largely preserved and transferred into the solid state. The specific density and surface of the obtained aerogels range from 0.05 to 0.26 g/cm3 and from 172 to 284 m2/g, respectively, depending on the cellulose content of the Lyocell dopes and regeneration procedure. A reliable extraction and drying procedure using supercritical carbon dioxide, the advantageous use of NBnMO as stabilizer for the Lyocell dopes, and selected physical properties of the materials is communicated.

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来源期刊

Advances in Materials Science and Engineering Materials Science-General Materials Science

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Advances in Materials Science and Engineering is a broad scope journal that publishes articles in all areas of materials science and engineering including, but not limited to: -Chemistry and fundamental properties of matter -Material synthesis, fabrication, manufacture, and processing -Magnetic, electrical, thermal, and optical properties of materials -Strength, durability, and mechanical behaviour of materials -Consideration of materials in structural design, modelling, and engineering -Green and renewable materials, and consideration of materials’ life cycles -Materials in specialist applications (such as medicine, energy, aerospace, and nanotechnology)