Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 12, Pages 17160-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04549
Keywords
Hybrid cellular material; Low weight; Air-drying; 3D printing; Nanocellulose
Categories
Funding
- Swedish Energy Agency [P40121-1]
- Swedish Foundation for Strategic Research [RMA11-0065]
- Wallenberg Wood Science Center (WWSC)
- Swiss National Science Foundation [BSCG16157696, 200021159906/1]
- Swedish Foundation for Strategic Research (SSF) [RMA11-0065] Funding Source: Swedish Foundation for Strategic Research (SSF)
- Swedish Energy Agency (SEA) [P40121-1] Funding Source: Swedish Energy Agency (SEA)
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Polysaccharides are attractive sustainable resources for the fabrication of advanced materials, but the assembly of these building blocks into complex-shaped structures combining the high strength and low weight required in many applications remains challenging. We have investigated and optimized the rheological and mechanical properties of polysaccharide-based composite foams based on mixtures of methylcellulose (MC), cellulose nanofibrils (CNF), montmorillonite (MMT), and glyoxal and tannic acid. Such foams were found to be stabilized by the coadsorption of MC, CNF, and MMT at the air-water interface, while the complexation of the polysaccharides with tannic acid improved the foam stability. Tannic acid could also be used to tune and optimize the microstructure and the viscoelastic properties of the wet foam for direct ink writing of robust cellular architectures. Glyoxal had no noticeable effect on the properties of the wet foams but significantly enhanced the water resilience and stiffness of the lightweight material obtained after drying at ambient pressure and elevated temperatures with minimum shrinkage. The foams possessed a high porosity and displayed a specific Youngs modulus and yield strength that outperformed other biobased foams and commercially available expanded polystyrene. The strong and water-resilient 3D printed foams can be surface modified using, for example, aminosilanes, which opens up applications for air purification and thermal insulation.
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