Polymer-metal hybrid structures based on polydiphenylamine and Co nanoparticles

摘要

Polymer-metal hybrid structures based on polydiphenylamine (PDPhA) with Co nanoparticles homogeneously distributed in polymer matrix have been prepared for the first time. In situ synthesis of Co/PDPhA hybrid structure is carried out during condensation of diphenylamine crystalline oligomers in the presence of Co acetate (Co(CH3COO)24H2O) under the conditions of IR-irradiation. As a result, polymer chain growth occurs and hydrogen molecules are eliminated. Reduction of Co~(2+) up to Co° takes place under IR-irradiation with participation of hydrogen. The structure, content and morphology of obtained hybrid materials were characterized by Fourier-transform IR-spectroscopy, X-ray powder diffraction patterns, atomic-absorptive spectroscopy and transmission electron microscopy (TEM). Co nanoparticles appeared to exist in α-Co and β-Co modifications. Their relationship depends on IR-light intensity and time treatment. Co nanoparticles dimensions fall inside the limits of 2 < d < 8 ran as it is indicated from TEM microphotographs. Magnetic properties of Co/PDPhA were investigated and superparamagnetic behavior was proved. Thermal properties of nanocomposites were evaluated by thermogravimetric analysis and excellent thermal stability was shown.