title: Comparative characterization of TEMPO-oxidized cellulose nanofibril films prepared from non-wood resources.
abstract: Three non-wood celluloses, hemp bast holocellulose, and commercial bamboo and bagasse bleached kraft pulps, were oxidized by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation in water at pH 10. The water-insoluble TEMPO-oxidized celluloses thus obtained were converted to aqueous dispersions of TEMPO-oxidized cellulose nanofibrils (TOCNs) and then to self-standing TOCN films. Weight recovery ratios of the TEMPO-oxidized celluloses decreased to 70-80% and their carboxylate contents reached 1.5-1.7mmolg(-1) by the TEMPO-mediated oxidation. The viscosity-average degrees of polymerization remarkably decreased from 800-1100 to 200-480 by partial depolymerization occurring during the oxidation, depending on the non-wood celluloses used as the starting materials. The average lengths and widths of the TOCNs were estimated to be 500-650nm and 2.4-2.9nm, respectively, from their atomic force microscopy images. The self-standing TOCN films had high light-transparencies (>87% at 600nm), high tensile strengths (140-230MPa), high Young's moduli (7-11MPa), low coefficients of thermal expansion (4-6ppmK(-1)) in spite of low densities of 1.4-1.7gcm(-3). In particular, the TOCN films prepared from the hemp bast holocellulose had clearly high works of fracture (~30MJm(-3)), whereas those prepared from other two non-wood celluloses had 2-8MJm(-3).
authors.affiliation: Department of Biomaterial Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan.
authors.forename: Buapan
authors.initials: B
authors.lastname: Puangsin
authors.forename: Quanling
authors.initials: Q
authors.lastname: Yang
authors.forename: Tsuguyuki
authors.initials: T
authors.lastname: Saito
authors.forename: Akira
authors.initials: A
authors.lastname: Isogai
mesh_terms: D064751:Ammonium Compounds / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D003497:Cyclic N-Oxides / Q000737:chemistry*; D055119:Elastic Modulus; D006863:Hydrogen-Ion Concentration; D018625:Microscopy, Atomic Force; D057139:Nanofibers / Q000737:chemistry*; D010084:Oxidation-Reduction; D013718:Tensile Strength; D014866:Waste Products
chemical_list: D064751:Ammonium Compounds; D003497:Cyclic N-Oxides; D014866:Waste Products; D002482:Cellulose; C003959:TEMPO