RT Journal Article
T1 Study of The Reaction Mechanism to Produce Nanocellulose-Graft-Chitosan Polymer
A1 Sánchez Salvador, José Luis
A1 Balea Martín, Ana
A1 Monte Lara, María Concepción
A1 Blanco Suárez, María Ángeles
A1 Negro Álvarez, Carlos Manuel
AB 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.
PB MDPI
SN 2079-4991
YR 2018
FD 2018-10-30
LK https://hdl.handle.net/20.500.14352/12636
UL https://hdl.handle.net/20.500.14352/12636
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
NO Universidad Complutense de Madrid/Banco de Santander
DS Docta Complutense
RD 8 abr 2025