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Sclerotization-Inspired Aminoquinone Cross-Linking of Thermally Insulating and Moisture-Resilient Biobased Foams
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-13 , DOI: 10.1021/acssuschemeng.0c05601 Konstantin Kriechbaum 1 , Varvara Apostolopoulou-Kalkavoura 1 , Pierre Munier 1 , Lennart Bergström 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-13 , DOI: 10.1021/acssuschemeng.0c05601 Konstantin Kriechbaum 1 , Varvara Apostolopoulou-Kalkavoura 1 , Pierre Munier 1 , Lennart Bergström 1
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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.
中文翻译：
硬化和防潮生物基泡沫的硬化硬化启发性氨基醌交联。
基于纤维素纳米原纤维（CNF）的隔热泡沫和气凝胶是有希望替代基于化石的隔热材料的替代材料。我们展示了一种防潮轻质泡沫的可扩展路线，该路线依赖于硬化单宁启发的胺型CNF通过氧化单宁酸的迈克尔型交联。溶剂交换的，冰样的和醌鞣的交联的各向异性结构机械稳定，可以经受蒸发干燥，结构变化最小。低密度（7.7 kg m –3）交联的各向异性泡沫具有防潮性，在98％的相对湿度（RH）下显示90 kPa的压缩模量，在室温下的热导率值接近空气在20％和80％RH之间的值。受硬化作用启发的生物基泡沫的交联提供了一种节能高效且可扩展的途径，以生产可持续且耐湿的轻质材料。
更新日期：2020-12-01
中文翻译：
硬化和防潮生物基泡沫的硬化硬化启发性氨基醌交联。
基于纤维素纳米原纤维（CNF）的隔热泡沫和气凝胶是有希望替代基于化石的隔热材料的替代材料。我们展示了一种防潮轻质泡沫的可扩展路线，该路线依赖于硬化单宁启发的胺型CNF通过氧化单宁酸的迈克尔型交联。溶剂交换的，冰样的和醌鞣的交联的各向异性结构机械稳定，可以经受蒸发干燥，结构变化最小。低密度（7.7 kg m –3）交联的各向异性泡沫具有防潮性，在98％的相对湿度（RH）下显示90 kPa的压缩模量，在室温下的热导率值接近空气在20％和80％RH之间的值。受硬化作用启发的生物基泡沫的交联提供了一种节能高效且可扩展的途径，以生产可持续且耐湿的轻质材料。
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