Organo-modification of SiO_2- coated magnetite nanoparticles, and their loading into segmented polyurethane matrix

Due to the magnetite nano-particles have a tremendous influence on magnetic behavior of polymers, their loading into polymer (thermoset or thermoplast) matrix has a significant importance, therefore it has been widely studied.If the magnetite nanoparticles are coated in an organic or inorganic shell, they maintain magnetic properties and also reach enormous stability]1-2[. Firstly, Fe3O4 nano particles (NP s) are prepared by coprecipitation method. Then, silica shell is produced on the Fe3O4 core via reaction withTetraethyl orthosilicate. The resulting Fe3O4@SiO2 NP sare organically modified by OCN-terminated Polytetramethylene oxide (PTMO). Segmented PU matices are synthesized in the presence of Fe3O4@SiO2@PTMO NP s in different contents (Figure 1).