Korea-Japan Joint Symposium: Fundamental Polymer Science for Future Technology (영어발표)
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Syntheses of Ester Derivatives from Natural Polysaccharides and Their Application as Bio-based Plastic Material
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Polysaccharides are one of the most abundant natural polymers in the world, are not originally thermoplastic due to their inter- and intra-molecular hydtogen bondings derived from hydtoxyl groups in the polymer chain. In the present study, polysaccharide alkyl esters having different chain lengths (C2-C12) were synthesized to give them thermoplasticity, from xylan, glucomannan, curdlan, and pullulan. The complete esterification was carried out in carboxylic acid/trifluoro acetic anhydride mixed system. The chemical structures were characterized by NMR and GPC analyses. The esters from all polysaccharides formed transparent cast-films or thermo-pressed films. Their tensile properties were dependent on the alkyl chain length. The glass transition temperature of the esters decreased from ca. 180 ℃ for acetate to ca. 60 ℃ for laurate with increase in chain length. Specific characteristic of each esters and their possibility as plastic materials are proposed and discussed.