Study of The Reaction Mechanism to Produce Nanocellulose-Graft-Chitosan Polymer



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Sánchez Salvador, José Luis and Balea Martín, Ana and Monte Lara, María Concepción and Blanco Suárez, Ángeles and Negro Álvarez, Carlos Manuel (2018) Study of The Reaction Mechanism to Produce Nanocellulose-Graft-Chitosan Polymer. Nanomaterials, 8 (11). p. 883. ISSN 2079-4991

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Cellulose and chitin are the most abundant polymeric materials in nature, capable of replacing conventional synthetic polymers. From them, cellulose nano/microfibers (CNFs/CMFs) and chitosan are obtained. Both polymers have been used separately in graft copolymerization but there are not many studies on the use of cellulose and chitosan together as copolymers and the reaction mechanism is unknown. In this work, the reaction mechanism to produce nano/microcellulose-graft-chitosan polymer has been studied. Recycled cellulose pulp was used, with and without a 2,2,6,6-tetramethylpiperidin-1-oxyl-radical (TEMPO)-mediated oxidation pretreatment, to produce CNFs and CMFs, respectively. For chitosan, a low-molecular weight product dissolved in an acetic acid solution was prepared. Grafted polymers were synthesized using a microwave digester. Results showed that TEMPO-mediated oxidation as the cellulose pretreatment is a key factor to obtain the grafted polymer CNF-g-CH. A reaction mechanism has been proposed where the amino group of chitosan attacks the carboxylic group of oxidized cellulose, since non-oxidized CMFs do not achieve the desired grafting. 13C NMR spectra, elemental analysis and SEM images validated the proposed mechanism. Finally, CNF-g-CH was used as a promising material to remove water-based inks and dyes from wastewater.

Item Type:Article
Uncontrolled Keywords:cellulose nanofibers; cellulose microfibers; chitosan; grafting; reaction mechanism; nanocellulose-graft-chitosan; water-based inks
Subjects:Sciences > Chemistry > Paper industry
Sciences > Chemistry > Chemical engineering
Sciences > Chemistry > Materials
ID Code:66759
Deposited On:19 Jul 2021 14:36
Last Modified:20 Jul 2021 07:17

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