LIQUEFIED WOOD – ADVANCED CHARACTERIZATION OF LIGNIN-BASED POLYMER

摘要

The object of our present work was a comprehensive characterization of the liquefied wood that couldbe used as a feedstock for the well-defined polymer synthesis. Beside the determination of overall hydroxyl value thatwas found to be dependent on time, the chemical characterization of liquefied wood samples was carried out byquantitative ~(31)P, ~(13)C NMR analysis and by monitoring the change of molar masses using size-exclusionchromatography. Liquefied wood samples for analysis were prepared using a specific isolation procedure whichenabled the separation of high-molecular mass material (lignin-based polymer LBP) from low-molecular mass glycolfraction. The final LBP was produced by predominant condensation reactions between the aromatic lignin subunits asindicated by the decrease in total phenolic hydroxyl group content followed by the incorporation of the glycerol anddiethylene glycol moieties. The identification and quantification of the various reactive hydroxyl groups in the LBPopens a possibility of the well-defined polymer synthesis from renewable resources. Moreover, the molecular massand the hydroxyl group content of liquefaction product could be monitored by the duration of the liquefaction processand by the use of the particular alcohols.