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Open AccessArticle

Characterization of Porous Structures of Cellulose Nanofibrils Loaded with Salicylic Acid

1
SINTEF Industry, P.O. Box 4760 Torgarden, 7034 Trondheim, Norway
2
RISE PFI, Høgskoleringen 6b, 7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(11), 2538; https://doi.org/10.3390/polym12112538
Received: 5 October 2020 / Revised: 26 October 2020 / Accepted: 27 October 2020 / Published: 30 October 2020
Bleached and unbleached pulp fibers were treated with 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) mediated oxidation to obtain cellulose nanofibrils (CNFs). The resulting bleached and unbleached CNFs were mixed with salicylic acid (0, 5, 10, 20 wt%) before casting and freeze-drying or 3D-printing. A series of methods were tested and implemented to characterize the CNF materials and the porous structures loaded with salicylic acid. The CNFs were characterized with atomic force microscopy and laser profilometry, and release of salicylic acid was quantified with UV-visible absorbance spectroscopy, conductivity measurements, and inductive coupled plasma mass spectrometry (ICP-MS). Fourier-transform infrared spectroscopy (FTIR) complemented the analyses. Herein, we show that aerogels of bleached CNFs yield a greater release of salicylic acid, compared to CNF obtained from unbleached pulp. The results suggest that biodegradable constructs of CNFs can be loaded with a plant hormone that is released slowly over time, which may find uses in small scale agricultural applications and for the private home market. View Full-Text
Keywords: nanocellulose; scaffolds; chemical elicitor; plant resistance; pesticide nanocellulose; scaffolds; chemical elicitor; plant resistance; pesticide
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MDPI and ACS Style

McDonagh, B.H.; Chinga-Carrasco, G. Characterization of Porous Structures of Cellulose Nanofibrils Loaded with Salicylic Acid. Polymers 2020, 12, 2538.

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