Versatile processing routes that utilize renewable or Earth abundant resources and additives are needed to enable scalable production of multifunctional foams, aerogels and films for applications including packaging, sensors and energy storage, e.g. thermal insulation. This presentation will give examples how tannins, the second most abundant aromatic polymer, can be used to both control and tune the rheological properties and to infer specific functionalities to nanocellulose-based foams and films. We have developed and investigated polysaccharide-based composite foams for 3D printing of lightweight structures. The rheological properties of the wet foams and the resistance to shrinkage during drying were tuned by addition of e.g. tannic acid and glyoxal and the drying temperature. Tannic acid addition optimized the microstructure and the viscoelastic properties of the wet foam for direct ink writing of lightweight and water-resilient structures that could be post-functionalized. Inspired by the ancient Bogolanfini dyeing technique from Mali, we have functionalized and patterned nanocellulose films by surface-bound nanoparticles of hydrolyzable tannins and multivalent metal ions with tunable colors. AFM and electron microscopy showed that the tannin-metal ion nanoparticles formed by an in-fibre reaction between the pre-impregnated tannin and the metal ions in the printing ink. Patterning of CNF films with metal ion-hydrolyzable tannin nanoparticles is a versatile route to functional films based on organic materials derived from trees and abundant metal ions.

Functionalization and patterning of nanocellulose-based foams and films with tannins

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.