Аннотация:Transformations of aspen and pine wood under ozone impact are investigated by synchronous thermal analysis, coupled with mass spectrometric (MS) analysis of non-condensed products of biomass pyrolysis. The MS analysis of pyrolysis products of ozonized samples indicates a decrease in lignin and hemicellulose amounts, and a formation of oxygen-containing biomass ozonation products. It is assumed that ozone treatment of wood results in not only destruction, but also polycondensation of aromatic structures of lignin. For aspen wood, the polycondensation is noticeably less pronounced as compared to the pine
