title: Influence of TEMPO-oxidized cellulose nanofibril length on film properties.
abstract: Various mechanical disintegration conditions in water were applied to 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose to prepare TEMPO-oxidized cellulose nanofibrils (TOCNs) of uniform widths ∼4 nm but with three different average lengths, 200, 680, and 1100 nm. The viscosity average degrees of polymerization of the TOCNs were 250, 350, and 400, respectively. Self-standing TOCN and TOCN-coated poly(ethylene terephthalate) (PET) and poly(lactic acid) (PLA) films were prepared, and the optical, mechanical and gas-barrier properties of the films were evaluated in terms of nanofibril length. Only small differences in density, water content, and elastic modulus of the films were observed but TOCN films prepared from longer nanofibrils clearly showed higher tensile strengths, elongations at break and crystallinity indices. The oxygen barrier properties of the TOCN-coated PET and PLA films increased with increasing nanofibril length. In contrast, nanofibril length had almost no influence on water vapor-barrier properties.
authors: Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
authors: Hayaka
authors: H
authors: Fukuzumi
authors: Tsuguyuki
authors: T
authors: Saito
authors: Akira
authors: A
authors: Isogai
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D001696:Biomechanical Phenomena; D002483:Cellulose, Oxidized / Q000737:chemistry*; D003497:Cyclic N-Oxides / Q000737:chemistry*; D055119:Elastic Modulus; D008422:Materials Testing / Q000379:methods*; D057139:Nanofibers / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010539:Permeability; D011092:Polyethylene Glycols / Q000737:chemistry; D011093:Polyethylene Terephthalates; D058105:Polymerization; D013314:Stress, Mechanical; D013329:Structure-Activity Relationship; D013499:Surface Properties; D013718:Tensile Strength; D014867:Water / Q000737:chemistry; D014934:Wood / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D002483:Cellulose, Oxidized; D003497:Cyclic N-Oxides; D011093:Polyethylene Terephthalates; D014867:Water; D011092:Polyethylene Glycols; D010100:Oxygen; C003959:TEMPO