Browsing by Publisher "Elsevier Science SA"
Now showing items 1-5 of 5
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Fluorescence quenching method for monitoring oxygen diffusion into PS/CNT composite films
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Publisher and Date:(Elsevier Science SA, 2013)Oxygen permeabilities of nanocomposite films consisting of multi wall carbon nanotubes (MWNT) and polystyrene (PS) were determined to investigate the oxygen diffusion depending on MWNT and temperature. A method which is based on quenching of an excited phosphorescent by oxygen was applied for the measurements. The composite films were prepared from mixtures of (MWNT) and surfactant-free pyrene (P)-labeled (PS) latexes of various compositions at room temperature. These films were then annealed at ...
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Investigation of PSt-MWCNT concentration on epoxyacrylate photopolymerization and conductivity of polymer films
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Publisher and Date:(Elsevier Science SA, 2013)Photopolymerization kinetics and conductivity changes of epoxyacrylate composites for various loading modified PSt-MWCNT weight fractions changing from 0.0025 to 0.2 wt.% were evaluated by performing photo differential scanning calorimetry (photo-DSC) and four point conductivity measurements. 0.2% PSt-MWCNT additive polymeric films had their electrical conductivity boosted by 6% more than non-additive polymeric films. (C) 2012 Elsevier B.V. All rights reserved.
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Percolation of glassy regions during photopolymerization of epoxy acrylate in DMF
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Publisher and Date:(Elsevier Science SA, 2015)The gelation of epoxy acrylate (EA) 80% and tripropyleneglycol diacrylate (TPGDA) 20% was studied through the use of photo-differential scanning calorimetric (photo-DSC) technique in the presence of a thioxanthone based initiator. Photo-induced polymerization reactions were performed under identical conditions of temperature initiator concentration and UV light intensity in various NN-dimethylformamide (DMF) contents. Photo-DSC technique allowed us to monitor the gelation without disturbing the ...
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Producing critical exponents from gelation for various photoinitiator concentrations; a photo differential scanning calorimetric study
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Publisher and Date:(Elsevier Science SA, 2012)Photoinitiated radical polymerization of an 80 wt% epoxy diacrylate (EA) and 20 wt% tripropyleneglycoldiacrylate (TPGDA) mixture with various 2-Mercaptothioxanthone (TX-SH) photoinitiator concentrations was studied by using photo-differential scanning calorimetric (Photo-DSC) technique. Photopolymerization reactions were carried out under the same conditions of temperature and light intensity. It was observed that all conversion curves during gelation at various photoinitiator concentration present ...
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The Electrochromic Performances of Single Phase VO2 Nanoparticled Films
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Publisher and Date:(Elsevier Science SA, 2016)In the present work pure phase vanadium oxide VO2 nanoparticled films were synthesized using acetate based sol-gel precursors. The effect of the water: Vanadyl acetylacetonate ratio on electrochemical and structural properties of nanostructured vanadium oxide films was examined. The X-ray diffraction studies indicated that very strong crystallization of the VO2 monoclinic phase occurred for the as-deposited films at the annealing temperature of 500 degrees C. According to the atomic force microscopy ...
