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Electrical Response of Silanization of Rubber Mixtures

Advances in Materials Physics and Chemistry 2013年第2期3卷 105-111页

作者： Emil Seliga Ondrej Bosak Stanislav Minarik Marian Kubliha Vladimir Labas Juraj Slabeycius Department of Physics Institute of MaterialsFaculty of Materials ScienceSlovak University of TechnologyTrnavaSlovak Republic Department of Physics Faculty of EducationCatholic UniversityRuzomberokSlovak Republic

There are a number of experimental methods aimed at the investigation of structural transformations. These methods differ from each other by a spectrum of quantitative indicators and their application is limited by the nature of investigated structures and processes. In a sense, it is also possible to consider the silanization of rubber mixtures as a structural transformation. Experimental observation of transformations of disordered rubber mixtures type structures can be quite difficult. The contribution deals with the theoretical principles of experimental methodology oriented on the investigation of silanization of rubber mixtures. We analyze the electrical response of rubber mixtures silanization. Our attention is focused on the modeling of a possible electrical response of a chemical reaction in a system consisting of several components. The results of the model are compared with experimental data measured during the silanization reaction in rubber mixtures.

关键词： Silanization Electrical Response Chemical Kinetics Rubber Mixture Electrical Conductivity

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A comparison of soft magnetic composites designed from different ferromagnetic powders and phenolic resins

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Chinese Journal of Chemical Engineering 2015年第4期23卷 736-743页

作者： Magdalena Streckova Radovan Bures Maria Faberova Lubomir Medvecky Jan Fuzer Peter Kollar Institute of Materials Research Slovak Academy of Sciences Watsonova 47043 53 Kosice Slovak Republic Institute of Physics Faculty of Science P. J. afárik University Park Angelinum 9040 01 Kosice Slovak Republic

Soft magnetic composites （SMCs） were prepared from three different ferromagnetic powder particles： iron powder ASC 100.29, spherical FeSi particles and vitroperm （Fe73CulNb3Si16B7） flakes. Two types of hybrid organic-inorganic phenolic resins modified with either silica nanoparticles or boron were used to design a thin insulating layer perfect- ly covering the ferromagnetic particles. Fourier transform infrared （FTIR） spectrometry confirmed an incorporation of silica or boron into the polymer matrix, which manifested itself through an improved thermal stability of the hybrid resins verified by thermogravimetric-differential scanning calorimetry （TG-DSC） analysis. The core-shell particles prepared from the ferromagnetic powder particles and the modified hybrid resins were further compacted to the cylindrical and toroidal shapes for the mechanical, electrical and magnetic testing. A uniform distribution of the resin between the ferromagnetic particles was evidenced by scanning electron microscope （SEM） analysis, which was also reflected in a rather high value of the electrical resistivity. A low porosity and extraordinary high values of mechanical hardness and flexural strength were found in SMC consisting of the iron powder and phenolic resin modified with boron. The coercive fields of the prepared samples were comparable with the commercial SMCs.

关键词： Composite materialsCore-shell particlesFourier transform infrared (FTIR) spectroscopyPowder metallurgySol-gel method

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