title: Improvement of the Thermal Stability of TEMPO-Oxidized Cellulose Nanofibrils by Heat-Induced Conversion of Ionic Bonds to Amide Bonds.
abstract: Improving thermal stability of TEMPO-oxidized cellulose nanofibrils (TOCNs) is a major challenge for the development and preparation of new nanocomposites. However, thermal degradation of TOCNs occurs at 220 °C. The present study reports a simple way to improve thermal stability of TOCNs by the heat-induced conversion of ionic bonds to amide bonds. Coupling amine-terminated polyethylene glycol to the TOCNs is performed through ionic bond formation. Films are produced from the dispersions by the casting method. Infrared spectroscopy and thermogravimetric analysis confirm conversion of ionic bonds to amide bonds for the modified TOCN samples after heating. As a result, improvement of TOCNs' thermal stability by up to 90 °C is successfully achieved.
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Lavoine
authors.affiliation: CNRS, LGP2, University Grenoble Alpes, F-38000, Grenoble, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Bras
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan.
authors.forename: Tsuguyuki
authors.initials: T
authors.lastname: Saito
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Isogai
mesh_terms: D000577:Amides / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D003497:Cyclic N-Oxides / Q000737:chemistry*; D006358:Hot Temperature; D007477:Ions / Q000737:chemistry; D057139:Nanofibers / Q000737:chemistry*; D010084:Oxidation-Reduction; D013696:Temperature
chemical_list: D000577:Amides; D003497:Cyclic N-Oxides; D007477:Ions; D002482:Cellulose; C003959:TEMPO
keywords: TEMPO-oxidized cellulose nanofibrils; amides; heat-induced conversion; ionic bonds; thermal stability