Enzymatic oxidative polymerization of phenol has been performed in an aqueous organic solvent using horseradish peroxidase as catalyst to produce a new family of phenol resin. The resulting polymer was partly soluble in DMF and DMSO and the fraction soluble in DMF has molecular weight of 3.5 × 104. From IR and 1H NMR analyses, the polymer structure was found to be composed of a mixture of phenylene and oxyphenylene units.
Enzymatic oxidative polymerization of phenol has been carried out in an aqueous organic solvent using horseradish peroxidase as catalyst. The polymerization in a mixture of 1,4-dioxane and phosphate buffer (pH 7.0) (80 : 20 vol%) produced powdery polymeric materials, which were partly soluble in DMF and DMSO. The molecular weight of the DMF-soluble part determined by GPC was 3.5 × 104. Polymerization conditions have been investigated with respect to the polymer yield, solubility, and molecular weight. The solvent composition enormously affected the polymerization. The polymer structure was estimated by IR and NMR spectroscopies and found to contain a mixture of phenylene and oxyphenylene units. From TG analysis, the polymer was found to possess high thermal stability; 43 weight % of the polymer remained up to 1000 °C under nitrogen. DSC measurement showed no clear glass transition temperature or melting point.
SUM MARYEnzymatic oxidative polymerization of 4,4'-biphenyldiol was performed in an aqueous organic solvent using horseradish peroxidase as catalyst. In the polymerization using a mixture of 1,4-dioxane and phosphate buffer (pH 7.0) (80:20 vol-96) as solvent, the monomer was quantitatively consumed to give powdery polymeric materials in a high yield. The resulting polymer is soluble in polar solvents such as N,N-dimethylformamide. dimethyl sulfoxide, and acetone. The molecular weight of the methylated product is 7.3 x lo3. The polymer exhibits high thermal stability under nitrogen.
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