Journal
CARBOHYDRATE POLYMERS
Volume 213, Issue -, Pages 346-351Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.02.073
Keywords
Cellulose nanofibrils; Cellulose nanocrystals; Cross-linking; Directional freezing; Foams
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Funding
- University of Tennessee and Governor's Chair Program
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Aligned micro- and nanoporous materials have gained tremendous interest since they provide great potential in organic electronics, absorbents, biomedicine and tissue engineering. Herein, cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs) cross-linked with poly(methyl vinyl ether-co-maleic acid) (PMVEMA) and poly (ethylene glycol) (PEG) foams were prepared by both the directional and un-directional freezing techniques. Aligned three-dimensional porous structures were observed for the directional frozen foams after lyophilization via scanning electron microscope (SEM). As a result, these highly organized structures exhibited enhanced mechanical performance properties. Particularly, for the 25% CNF foams, the compression modulus increased 60% compared with the un-directional frozen samples. These nanocellulosics-based foams could absorb up to 10-fold water of their initial weight with excellent water stability when immersed in water for more than 48 h. Overall, this study describes a novel process combining cross-linking and directional freezing which successfully fabricates naturally derived foams with anisotropic structure.
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