Key words: crosslinked polymeric networks, crosslinking agents, supercritical carbon dioxide, rhodium acetylacetonate, impregnation, rhodium nanosized particles
Three types of polymers — phenol-formaldehyde copolymer, polypropyleneimine and polyamidoamine dendrimeres — are synthesized using polycondensation method. Mesoporous polymeric networks are formed by treating two last polymers with crosslinking agents. For the first time an impregnation of polymeric networks with rhodium acetylacetonate in supercritical carbon dioxide is carried out and optimal conditions are determined. Using Raman spectroscopy it is shown that metal content in polymer networks is within the range of 0,3—2,0% mass. depending on the type of polymer and crosslinking agent and on the crosslinking degree. By reduction of immobilized rhodium acetylacetonate with molecular hydrogen polymer samples including rhodium nanoparticles are obtained. According to preliminary data, these samples possess extremely high activity as catalysts for hydrogenation of unsaturated compounds.