Polymer-Oxide Composites: Toward New Optical Materials

Abstract

Brief summary concerning properties of the polymer matrix incorporated with inorganic, e.g. oxide particles, micro/nanocomposites and opportunity to use these composites as optical materials for modern optics and optoelectronic devices is presented in the work. Structure and morphology of the several sets of the new polymer micro/nanocomposites based on the microcrystalline cellulose incorporated with micro/nanoparticle of various oxides (NaNO2, La1−xSmxVO4, La1−xEuxVO4 and K2Eu(PO4)(MoO4)), were prepared by "dry" and "wet" cool pressing procedure. Morphology of these composites was described as ensemble of cellulose plates and located gains of the oxide particles. Temperature dependences of complex dielectric permittivity and luminescence properties of the composites were studied. Temperature and electromagnetic field frequency dependences of the dielectric permittivity revealed influence of oxide particles on the characteristics of the microcrystalline cellulose. Both wide band (matrix emission) and narrow lines (RE ions emission) of visible luminescence (350-750 nm range) of the composites is excited in the range 250-550 nm. The luminescence characteristics displayed effect of cellulose on the electronic system of the Sm 3+ and Eu 3+ ions and effect of oxide particles on the cellulose matrix was shown, too. Spectral characteristics and high intensity of luminescence showed perspectives of studied composites to be used as light converters in LED and elsewhere as optics luminescent materials.

Adsorption and Decomposition of Peroxides on the Surfaces of Dispersed Oxides Fe2O3, Cr2O3 and V2O5

“…ln(k p − k)/S a = lnk s + (ρ − 1)lnC (3) The specific rates of decomposition of peroxides showed that with the increasing of peroxide concentration the numerical values of k p decrease. The increase in the concentration of peroxide leads to the decrease in the numerical values of k p .…”

“…where S a is the area of surface of the dispersed phase in 1 liter of mixture, C-is the initial concentration of peroxide in the system, ρ is the kinetic order of the reaction of the heterogeneous catalytic decomposition, k s is the rate constant of the decomposition of peroxide on the surface of the adsorbent. The Equation 2becomes an Equation (3). This determines the parameters of the heterogeneouscatalytic decomposition:…”

“…Hybrid organic-mineral composites are produced with the incorporation of inorganic fillers in the structure of polymer [1][2][3][4][5][6]. Polymer-mineral composites have unique properties, therefore, the study of their synthesis and physicochemical properties is urgently required.…”

“…The polymer matrix incorporated with inorganic particles forms the micro/nanocomposites that can be used in different fields of industry [2]. These composites may be used as optical materials for modern optics and optoelectronic devices [3]. Conjugated polymers with different inorganic nanoparticles can form the hybrid structure with electrical conductivity and catalytic functions [4].…”

Preparation of Polymer-Mineral Nanocomposites Based on Vinyl Monomers and Dispersed Inorganic Oxides

“…The filler performs many functions in the composite, providing the material with specific properties [1] [2]. The hybrid organic-mineral composites are produced with the incorporation of inorganic fillers in the structure of polymer [3] [4] [5]. The polymer matrix incorporated with inorganic particles forms the micro/nanocomposites that can be used in different fields of industry [1] [4].…”