Design and Function of Lignin-Based Recyclable Composites

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概要

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• Through the phase-separation system composed of phenols and concentrated acid, the phenol components are selectively hybridized into Cl-positions of phenylpropane units of native lignin to give 1, 1-bis (aryl) propane-type linear polymers (lignophenols) quantitatively. Lignophenols have unique properties such as high phenolic activity and obvious phase transition. Furthermore, the functionality of lignophenols was able to be controlled using the intramolecular switching function : Under alkaline condition, Cl-phenols in lignophenols nucleophilically attack adjacent C2 as switching devices, followed by the cleavage of aryl ether linkages. In ligno-p-cresol and ligno-2, 4-dimethylphenol with similar switching functionality and structural characteristics, ligno-p-cresol was highly hydroxymethylated (HM) on the cresolic nucleus to give network-living pre-polymer. On the other hand, ligno-2, 4-dimethylphenol having reactive sites mainly on the terminal unit gave linear-living pre-polymers. The structures of polymerized lignophenols were controlled by mixing ratio of HM-ligno-p-cresol and HM-ligno-2, 4-dimethylphenol or by the hybridization ratio of p-cresol and 2, 4-dimethylphenol in lignophenols followed by hydoxymethylation. The resulting polymer chains were cleaved at the switching points to give low molecular weight subunits by the switching function. Recyclable composites were prepared by the combination of cellulose and HM-lignophenol (the mixing ratio of HM-ligno-p-cresol to HM-ligno-2, 4-dimethylphenol was 1 : 0, 1 : 1, 0 : 1, respectively). The composites had glossy surfaces and looked like wood. The dimensional stability of composites was improved significantly with increasing mixing ratio of HM-ligno-p-cresol to HM-ligno-2, 4-dimethylphenol. Using the switching functionality of lignophenol, the composites were re-separated into lignophenols with low molecular weight and cellulose.

• 社団法人日本材料学会の論文
• 2003-03-15

著者

• Funaoka Masamitsu

  Faculty Of Bioresources Mie University

• NAGAMATSU Yukiko

  Faculty of Bioresources, Mie University

• Nagamatsu Y

  Faculty Of Bioresources Mie University

• Nagamatsu Yukiko

  Faculty Of Bioresources Mie University

関連論文

• Effect of Calcium on the Catalysis of Nickel in the Production of Crystallized Carbon from Lignocresol for Electromagnetic Shielding
• Polymer Structure of Lignophenol I : Structure and Function of Fractionated Lignophenol
• Polymer Structure of Lignophenol II : Comparison of Molecular Morphology of Lignophenol and Conventional Lignins
• Conversion and Separation Pattern of Lignocellulosic Carbohydrates through the Phase-separation System
• Mechanical and Thermal Properties of Biopolyester-Lignophenol Films
• Design and Function of Lignin-Based Recyclable Composites
• Plasticization of Lignocellulosics through the Phase-Separation System for the Resources Circulation

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