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Modified and unmodified zinc oxide as coagent in elastomer compounds

Kołodziejczak-Radzimska A., Jesionowski T., Maciejewska M., Zaborski M.

Polish Journal of Chemical Technology

2014

Vol. 16, nr 3

63--68

The aim of this work was to study the activity of unmodifi ed and modifi ed ZnO in the peroxide crosslinking of hydrogenated acrylonitrile-butadiene elastomer (HNBR) and ethylene-propylene copolymer (EPM). In the fi rst step, zinc oxide was obtained by emulsion precipitation. Maleic acid was introduced onto the surface of ZnO Rusing an in situ method. The unmodified and modified zinc oxide was characterized using dispersive and morphological analysis, BET surface area analysis, and elemental, spectroscopic and thermal analysis. In the second stage of the research, the ZnO/MA systems were incorporated into the structure of elastomer compounds improving the kinetic and mechanical properties of vulcanizates. The proposed modification method had a favorable effect on the physicochemical properties of the zinc oxide and on the kinetic and mechanical properties of the vulcanizates. This study demonstrated that modification of zinc oxide by maleic acid is a promising technique.

Adsorption of c.i. basic blue 9 onto TiO2-SiO2 inorganic support

Przybylska A., Siwinska-Stefanska K., Ciesielczyk F., Jesionowski T.

Physicochemical Problems of Mineral Processing

2012

Vol. 48, iss. 1

103-112

Adsorption of C.I. Basic Blue 9 (Methylene Blue Hydrate) on the surface of TiO2-SiO2 oxide composite unmodified or functionalized with N-2-(aminoethyl)-3-amino propyltrimethoxsysilane was investigated. The organic dye was supported on inorganic TiO2-SiO2 oxide composite precipitated in the emulsion system. The process of adsorption was performed for the dye concentrations from 100 to 3000 mg/dm3. Specific surface area of support was determined prior to and after modification with aminosilane. The pigments obtained were subjected to characterization of their physicochemical properties, including particle size distributions and surface morphology as well as colorimetric analysis. Elemental analysis allowed evaluation of the degree of support coverage with the dye. The data obtained permitted assessment of the pigments quality and the effectiveness of support surface modification.