Magnetized styrene‐divinylbenzene resins can be obtained by inserting superparamagnetic nanoparticles of maghemite (γ‐Fe2O3) in the polymeric matrix. The incorporation of this nanoparticulate material can be influenced by several factors. The objective of this work was to evaluate the influence of these variables through an experimental design, where three factors were evaluated: cross‐linking degree, initiator content and porogenic agent, at two levels. Subsequently, to evaluate the properties of the synthesized magnetized resins, magnetization curves were plotted using a vibrating sample magnetometer, thermal stability of the magnetized copolymer was determined by thermogravimetric analysis and the morphology was observed by scanning electron microscopy. The highest initiator content produced the greatest synthesis yield, and the presence of toluene had a positive effect on saturation magnetization, indicating that incorporation of maghemite in the polymer matrix and thermal degradation were influenced by higher divinylbenzene content.

Nanopartículas de maghemita (γ-Fe2O3) vem sendo sintetizadas pela técnica de coprecipitação por hidrólise alcalina para magnetizar matrizes poliméricas. Neste trabalho foram sintetizadas nanopartículas de ferro caracterizadas por diferentes técnicas mostrando pelo seu tamanho de partícula que esse material apresentou propriedades superparamagnéticas.