Preparation Of Polymer/Inorganic Nanocomposite With Electrical And Magnetic Properties By Ultrasonic Irradiation

In this study, ultrasonic irradiation was applied to prepare polymer/inorganic nanocomposite with electrical and magnetic properties. When the inorganic nanomaterials were dispersed at nano scale by the intense stirring and dispersion effects of ultrasound, the in-situ polymerization of monomers were carried out, and polystyrene/Fe₃O₄, polyaniline/Fe₃O₄, polypyrrole/Fe₃O₄ and polyaniline/carbon nanotubes nanocomposite were prepared. The main conclusions are as follows:1. Ultrasonically initiated miniemulsion polymerization of styrene in the presence of Fe₃O₄ nanoparticles was successfully employed to prepare polystyrene (PS) /Fe₃O₄ magnetic emulsion and nanocomposite. The whole procedure contained two steps. First, Fe₃O₄ nanoparticles were dispersed in the monomer phase with the aid of stabilizer Span-80. Second, ultrasonically initiated miniemulsion polymerization of styrene in the presence of Fe₃O₄ nanoparticles was carried out. The affecting factors, including stabilizer concentration, surfactant concentration, hexadecane concentration and the amount of Fe₃O₄, were systematically studied. Stabilizer concentration, surfactant concentration and hexadecane concentration strongly affected the formation of the coagulation.