NANOPARTICLES BASED ON MODIFIED LIGNINS WITH BIOCIDE PROPERTIES

The paper discusses the obtaining and characterization of nanoparticles based on hydroxymethyl and epoxy lignin, which were tested in terms of their biocidal properties. Lignins from annual plants (wheat straw and Sarkanda grass) and commercial products (Protobind 1000, 2000, 3000), offered by Granit Recherche Developement SA Lausanne – Switzerland, were used for the reactions. Under suitable synthesis conditions, nanoparticles used for the treatment of birch veneer samples were obtained. The samples were immersed successively in 5% concentrated solutions containing copper ions and unmodified and modified lignins, dissolved in 0.1N ammonia solutions, which led to in situ complexes between the two partners. The biostability of the thus treated veneer samples was assessed by their burial in soil for 6 months, and by their characterization as to mass loss and contact angle values. The obtained results show that the treatment of birch veneer with complexes of nanoparticles with copper assures a high stability of the substrate timber products, comparatively with the unmodified products used for the same purpose.