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영어

Production of phenolic polymers catalyzed by peroxidases has been studied for decades and drawing much interest due to the environmentally friendly production process and mild reaction conditions. Various substituted phenols, aminophenols, and anilines have been polymerized
by peroxidases in organic solvents-water mixtures (1, 2). Phenolic polymers thus produced have potentials as alternative materials in a wide range of fields where conventional phenol-formaldehyde polymers, resols and novolak, have been used. In this study, various substituted
phenols and aminophenols were polymerized by horseradish peroxidase in a dioxane-aqueous buffer (100 mM sodium acetate, pH5) mixture (80% dioxane by volume) with H2O2 as an oxidant. DSC(differential scanning calorimetry) was used to investigate the structural features of the polymer products. The two types of phenolic products, substituted phenols and aminophenols, resulted in the distinctive DSC curves. Phenylphenol polymer shows complex structural transitions between 150-250℃ while phenylenediamine polymer shows a strong single
endothermic peak near 150℃. These DSC curves imply that the two types of phenol polymers possess different structures; more amorphous nature for phenylphenol polymer and an homogeneous oriented nature for phenylenediamine polymer.