Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 7, Pages 6453-6461Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15561
Keywords
montmorillonite; nanocellulose; PVA; foam; mechanical properties; moisture
Funding
- Swedish Foundation for Strategic Research (SSF)
- Knut and Alice Wallenberg Foundation through the Wallenberg Wood Science Centre (WWSC)
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Clay aerogels are foam-like materials with potential to combine high mechanical performance with fire retardancy. However, the compression strength of these aerogels is much lower than theoretically predicted values. High-strength aerogels with more than 95% porosity were prepared from a ternary material system based on poly(vinyl alcohol), montmorillonite clay platelets, and cellulose nano fibrils. A hydrocolloidal suspension of the three components was subjected to freeze-drying so that a low-density aerogel foam was formed. Cell structure was studied by field-emission scanning electron microscopy. Interactions at the molecular scale were observed by X-ray diffraction and Fourier transform infrared spectroscopy. Cross-linking was carried out using glutaraldehyde or borax, and moisture stability was investigated. These biobased ternary aerogels showed compression strength much better than that of previously studied materials and also showed strength higher than that of high-performance sandwich foam cores such as cross-linked polyvinyl chloride foams.
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