New Materials Reassembled from Wood Cell Walls Using Organic Acids

DOI Web Site 3 References
  • Watanabe Takashi
    Division of Biomass Product Tree Industry-Academia Collaborative Research, Kyoto University Center for Future Pioneering Research on the Humanosphere, Research Institute for Sustainable Humanosphere, Kyoto University

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Other Title
  • 木を溶かしてつくる新素材
  • ─有機酸による植物細胞壁リアッセンブリ素材の創成─

Description

<p>Woody biomass is the most abundant renewable resource. Plant secondary cell walls comprise a heterogeneous aromatic polymer, lignin, and structural polysaccharides, cellulose and hemicelluloses. Hemicelluloses are associated with cellulose microfibrils mainly by hydrogen bonding and cross-linked with lignin by covalent linkages to form lignin-carbohydrate complexes（LCCs）．These components form rigid matrices via noncovalent bonds, such as hydrogen bonds, van der Waals forces, and hydrophobic interactions. Despite wood’s potential as a resource for mitigating environmental impacts, current plasticized wood products depend on petroleum-derived chemicals. Additionally, paper and pulp are manufactured from wood through environmentally high-load processes involving the sulfur reactions at high temperatures to depolymerize the recalcitrant lignin in wood components and subsequent paper making processes using huge amounts of water. We found the dissolution of wood sawdust and chips in formic acid under ultra-mild conditions without any catalysts, and the subsequent production of the plastic-like film comparable to those of acryl resin from the total dissolved solution of Eucalyptus globulus, and of paper-like sheet from Japanese cedar. These two types of films were also produced from agriculture wastes. Furthermore, multi-dimensional NMR analyses revealed formylation of lignin, hemicelluloses and cellulose. Substituents of formyl groups broke the hydrogen bond networks among cell wall components, resulted in disintegration and solubilization of wood. Subsequently, the highly affinity molecules were bonded and reconstructed to form film by casting1）.</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 78 (8), 637-639, 2024

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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