Pigment in Plastics related Articles from the Polymer Library
Pigments in Plastics Abstracts
November 2008
The following abstracts relate to pigment in plastics-themed records recently added to the Polymer Library. By clicking on the 7 digit accession number or title, a Copyright Cleared copy of the full-text article can be ordered. For more information about accessing the Polymer Library please view our Subscription Information webpage.
| 1028732 | A NEW RUTHENIUM POLYPYRIDYL DYE, TG6, WHOSE PERFORMANCE IN DYE-SENSITIZED SOLAR CELLS IS SURPRISINGLY CLOSE TO THAT OF N719, THE "DYE TO BEAT" FOR 17 YEARS |
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The development of a new ruthenium polypyridine sensitiser for dye-sensitised solar cells (cis-bis(thiocyanato)(2,2'-bipyridyl-4,4'-dicarboxylato)(4,4'-bis(2-(4-hexylsulphanylphenyl)vinyl)-2,2'-bipyridine)ruthenium(II) mono(tetrabutylammonium)salt) is reported. The photovoltaic performance of a solar cell sensitised with this dye is compared with that of one sensitised with N719 (cis-bis(thiocyanato)bis(2,2'-bipyridine-4,4'-dicarboxylato)ruthenium(II) bis(tetrabutylammonium) salt. Various evaluation tools are employed, including varying the electrolyte, varying the titanium dioxide film thickness, charge density and recombination rate constant measurements, fluorescence lifetime and magnitude and transient absorption techniques. 39 refs.
Journal of Materials Chemistry, 18, No.36, 28th Sept.2008, p.4246-4253, ISSN: 0959-9428, DOI: 10.1039/b808255c Matar F; Ghaddar T H; Walley K; DosSantos T; Durrant J R; O'Regan B | |
| 1028661 | GOING WITH THE FLOW. ADDITIVES ENHANCE RHEOLOGY AND PIGMENT DISPERSION IN EXTRUSION |
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Difficulties associated with pigment and extender dispersion in powder coatings are discussed and the effectiveness of two process additives differing in adsorption tendencies for improving powder coating properties are evaluated. These additives are shown to reduce viscosity during extrusion and curing and facilitate wetting, thereby improving gloss, haze and other optical properties. They can also improve degassing and electrostatic charging. (Nurnberg Congress 2007, "Processing Additives for Powder Coatings", Nuremberg, 7th-9th May 2007). 4 refs.
European Coatings Journal, No.9, 2008, p.52/57, ISSN: 0930-3847 Juckel H | |
| 1028030 | ORGANIC INORGANIC DYE FILLER FOR POLYMER: BLUE-COLOURED LAYERED DOUBLE HYDROXIDES INTO POLYSTYRENE |
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A series of blue dye molecules, Evans blue (EB), Chicago sky blue (CB), Niagara blue (NB) were incorporated by direct co-precipitation within the galleries of negatively charge layered double hydroxide (LDH). The materials of cation composition Zn/Al = 2 lead to well-defined organic inorganic assemblies. The molecular arrangement of the interleaved dye molecule is proposed by 1D electronic density projection along the stacking direction for the hydrothermally treated samples with alternatively a highly inclined orientation of EB and CB and a parallel-bilayer arrangement for NB. Blue coloured LDH assemblies were subsequently dispersed into polystyrene (PS). It was found that the hybrid fillers do not interfere in the radical polymerisation of styrene, giving rise to similar molecular weight and polydispersity than filler free PS, while higher glass transition temperatures were obtained for the nanocomposites. This was consistent with the rheological behaviour with the observation for LDH/NB filler based nanocomposite of shear thinning exponent different from zero, underlining frictional interaction between filler and PS chain. The absorption maximum slightly blue-shifted for the hybrid filler in comparison to the corresponding organic dye was found unmodified for the PS nanocomposite, thus giving rise to blue coloured plastic films, reminiscent somehow of the blue Maya effect. 41 refs. Copyright (c) 2008 Elsevier Inc.
Journal of Colloid And Interface Science, 326, No.2, 2008, p.366-373, ISSN: 0021-9797, DOI: 10.1016/j.jcis.2008.06.030 Marangoni R; Taviot-Gueho C; Illaik A; Wypych F; Leroux F | |
| 1027962 | DIFFUSION OF POLYSTYRENE CHAINS AND FLUORESCENT DYE MOLECULES IN SEMIDILUTE AND CONCENTRATED POLYMER SOLUTIONS |
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Fluorescence correlation spectroscopy was used to measure the centre-of-mass diffusion coefficient of fluorescently labelled PS (weight-average molecular weight = 8100 g/mol) dissolved in toluene above the overlap concentration. The diffusion coefficient decreased by 2 orders of magnitude for a concentration change of 0.17-0.6 g/cc at 34 deg.C. Less dramatic changes occurred at higher temperatures. The results were compared with the diffusion of free dye (coumarin) in solutions with similar concentrations. By fitting the data with the Vrentas-Duda free volume theory, the unit size of transport was determined for the polymer and free dye in solution. The activation energy of diffusion increased dramatically at higher macromolecular concentration. 36 refs.
Macromolecules, 41, No.16, 26th Aug.2008, p.6191-6194, ISSN: 0024-9297, DOI: 10.1021/ma801035n Grabowski C A; Mukhopadhyay A | |
| 1027797 | ELECTRIC AND DIELECTRIC PROPERTIES OF SOME FLUORESCENT DYE/PMMA SOLAR CONCENTRATORS |
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Polymethyl methacrylate used in fluorescent solar concentrators was doped with three different dyes (perylene, rhodamin-6G and K1) and changes in the electrical and dielectric properties of the PMMA investigated. Samples were prepared by dissolving PMMA and dyes in chloroform and allowing the solvent to evaporate at room temperature. It was found that DC electrical conductivity increased with increasing dye concentration due to confined solvent molecules and that the addition of dye to PMMA caused changes in both the values and position of the maximum of the dielectric loss. Conduction obeyed a quantum mechanical tunnel model at low temperature and a correlated barrier-hopping model at high temperature. 22 refs.
International Journal of Polymeric Materials, 57, No.4-6, 2008, p.569-583, ISSN: 0091-4037, DOI: 10.1080/00914030701818314 Gabr M | |
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