THERMOCHEMICAL WOOD MODIFICATION WITH POLYMER BASED ON BISPHENOL PITCHES

The wood modified with thermochemical method including impregnation of wood samples with diane resin and subsequent heat treatment to cure the resin was obtained. The choice of the impregnating composition is explained, and the effect of the thermochemical modification conditions on the change of properties of birch and pine was studied. The indices of efficiency of impregnation and heat treatment of wood, as well as the mass fraction of free formaldehyde, water absorption, thermal stability and tensile strength under static bending, were determined. It is found that the wood modified with polymer based on diane resin has a number of improved properties as compared with natural timber: increased water resistance (the water absorption of modified birch wood decreased by 43.3 %, pine wood – by 37.7 %), higher heat resistance, higher strength properties. These results allow us to recommend modified wood for industrial applications. 

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