High-strength nanocomposite aerogels of ternary composition – polyvinyl alcohol, clay and cellulose nanofibrils
2017 (English)In: ACS Applied Materials & Interfaces, ISSN 1944-8244, Vol. 9, no 7, 6453-6461 p.Article in journal (Refereed) Published
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 PVA, MTM clay platelets and cellulose nanofibrils (CNF). A hydrocolloidal suspension of the three components, was subjected to freezedrying so that a low-density aerogel foam was formed. Cell structure was studied by FE-SEM microscopy. Interactions at the molecular scale were observed by XRD and FT-IR. Crosslinking was carried out using glutaraldehyde or borax, and moisture stability was investigated. These biobased ternary aerogels showed much better compression strength than previously studied materials, and show higher strength than high-performance sandwich foam cores such as crosslinked PVC foams.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 9, no 7, 6453-6461 p.
montmorillonite, nanocellulose, PVA, foam, mechanical properties, moisture
Research subject Fibre and Polymer Science
IdentifiersURN: urn:nbn:se:kth:diva-200931DOI: 10.1021/acsami.6b15561ScopusID: 2-s2.0-85013782831OAI: oai:DiVA.org:kth-200931DiVA: diva2:1078457
FunderKnut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research
QC 201703142017-03-032017-03-032017-03-14Bibliographically approved