Improvement of the Thermal Stability of TEMPO-Oxidized Cellulose Nanofibrils by Heat-Induced Conversion of Ionic Bonds to Amide Bonds

Nathalie Lavoine; Julien Bras; Tsuguyuki Saito; Akira Isogai

doi:10.1002/marc.201600186

Improvement of the Thermal Stability of TEMPO-Oxidized Cellulose Nanofibrils by Heat-Induced Conversion of Ionic Bonds to Amide Bonds

Macromol Rapid Commun. 2016 Jul;37(13):1033-9. doi: 10.1002/marc.201600186. Epub 2016 May 17.

Authors

Nathalie Lavoine¹, Julien Bras², Tsuguyuki Saito¹, Akira Isogai¹

Affiliations

¹ Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan.
² CNRS, LGP2, University Grenoble Alpes, F-38000, Grenoble, France.

PMID: 27184669
DOI: 10.1002/marc.201600186

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.

Keywords: TEMPO-oxidized cellulose nanofibrils; amides; heat-induced conversion; ionic bonds; thermal stability.

MeSH terms

Amides / chemistry*
Cellulose / chemistry*
Cyclic N-Oxides / chemistry*
Hot Temperature
Ions / chemistry
Nanofibers / chemistry*
Oxidation-Reduction
Temperature*

Substances

Amides
Cyclic N-Oxides
Ions
Cellulose
TEMPO