Cellulose Nanofibers Prepared from Wood Pulps, Their Characteristics and Potential Applications

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  • Isogai Akira
    Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo

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  • 木材パルプから得られるセルロースナノファイバーの特性と応用展開
  • モクザイ パルプ カラ エラレル セルロースナノファイバー ノ トクセイ ト オウヨウ テンカイ

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Abstract

Fundamental characteristics and potential applications of cellulose nanofibers prepared from wood bleached chemical pulps by TEMPO-mediated oxidation are reviewed based on the results obtained in our laboratory up to now and during collaboration studies with companies and university laboratories. Significant amounts of C6-sodium carboxylate groups can be formed selectively on crystalline cellulose microfibril surfaces in wood pulps by TEMPO-mediated oxidation in water at pH 10 within 2 h. The TEMPO-oxidized pulps with sufficient amounts of carboxyl groups are then convertible to highly crystalline nanofibers uniform 3-4 nm in width and>1μm in length, which are individually dispersed in water, by mild mechanical disintegration. Electrostatic repulsion and⁄or osmotic effect works well between anionically charged TEMPO-oxidized cellulose microfibrils (TOCNs) in water, thus resulting in the complete and efficient individualization of wood cellulose microfibrils. Transparent and flexible films with high strength, low oxygen permeability and low coefficient of thermal expansion are obtained by casting the TOCN⁄water dispersions on a plate. The TOCNs are expected to be used as new environmentally-compatible and bio-based nanofibers in the fields of high-performance packaging components and other high-tech devices.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 67 (6), 654-663, 2013

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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