Sclerotization-Inspired Aminoquinone Cross-Linking of Thermally Insulating and Moisture-Resilient Biobased Foams
| Autor: | Varvara Apostolopoulou-Kalkavoura, Lennart Bergström, Pierre Munier, Konstantin Kriechbaum |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering aerogel 02 engineering and technology 010402 general chemistry 01 natural sciences tannin chemistry.chemical_compound Thermal insulation Environmental Chemistry drying Composite material Cellulose Moisture Renewable Energy Sustainability and the Environment business.industry Aerogel General Chemistry 021001 nanoscience & nanotechnology cellulose 0104 chemical sciences chemistry ice-templating nanofibrils quinone tanning foam 0210 nano-technology business Research Article |
| Zdroj: | ACS Sustainable Chemistry & Engineering |
| ISSN: | 2168-0485 |
| Popis: | Thermally insulating foams and aerogels based on cellulose nanofibrils (CNFs) are promising alternatives to fossil-based thermal insulation materials. We demonstrate a scalable route for moisture-resilient lightweight foams that relies on sclerotization-inspired Michael-type cross-linking of amine-modified CNFs by oxidized tannic acid. The solvent-exchanged, ice-templated, and quinone-tanned cross-linked anisotropic structures were mechanically stable and could withstand evaporative drying with minimal structural change. The low-density (7.7 kg m–3) cross-linked anisotropic foams were moisture-resilient and displayed a compressive modulus of 90 kPa at 98% relative humidity (RH) and thermal conductivity values close to that of air between 20 and 80% RH at room temperature. Sclerotization-inspired cross-linking of biobased foams offers an energy-efficient and scalable route to produce sustainable and moisture-resilient lightweight materials. Moisture-stable and thermally insulating biobased foams were produced using nature-inspired, cross-linking, and energy-efficient evaporative drying. |
| Databáze: | OpenAIRE |
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