Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Photo-degradation"”.
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The Accelerated Photo-Degradation of Low Density Polyethylene
… in the range 280 - 340 nm as possible photo-activators to low density polyethylene (LDPE). They included benzophenone, substituted benzophenones, metal-di-thiocarbamates, transitional metal-complexes containing ligands, acetyl-acetone substituted salicylaldoximes, …
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Drop deformation dynamics in extensional flows : influence of chemical-, mechanical- and photo-degradation.
… shelf life. Therefore, understanding polymer degradation is crucial for achieving better performance. While there is extensive research on the polymer drop impact, the influence of dye and light on the polymer drop impact dynamics remains relatively unexplored. This work bridges the existing …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… analysis of UV-Vis and FTIR confirmed the photodegradation processes of BP and BPC of VOP and WOP. The increasing absorbance in UV-Vis spectra indicated the formation of quinone after UV-irradiation of BP and BPC of VOP and WOP. Furthermore, BP thin films shows rapid loss of tensile …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… analysis of UV-Vis and FTIR confirmed the photodegradation processes of BP and BPC of VOP and WOP. The increasing absorbance in UV-Vis spectra indicated the formation of quinone after UV-irradiation of BP and BPC of VOP and WOP. Furthermore, BP thin films shows rapid loss of tensile …
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A Study of the Role of Hydroperoxides in the Degradation and Stabilisation of Polymers
The photo-degradation mechanism of polyethylene was studied by means of functional group analysis using infrared spectroscopy. The rates of appearance and disappearance of key functional groups such as hydroperoxide, carbonyl, vinylidene, and vinyl formed during the photooxidation of the polymer …
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Growth by radio frequency sputtering and characterisation of rare earth doped wide bandgap oxides
… structural, chemical, optical and near-infra-red photoluminescence properties of wide band gap oxide films. The aim of the work was to develop materials with good photoluminescence properties, which can be applied to increase the photovoltaic conversion efficiency of crystalline Si-based solar …
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Effect of photoageing and plasticizer content on the mechanical and adhesive properties of polyvinylbutyral
… determine the effect of plasticizer content and photoageing on these properties. This data would be used to understand how the performance of laminated safety glass is related to the choice of adhesive interlayer. Samples of PVB plasticized with 0 to 40% butyl benzyl phthalate by weight were …
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TiO2 and ZnO metal oxides lattice defects driven magnetism and their contribution in discoloring of dyes
… point. These flowers-like rods were tested for photocatalytic activity under ultra-violet light. On the other hand, pure and manganese (Mn) ion-doped TiO2 films were grown by pulsed laser deposition under vacuum at different substrate temperatures 350 and 580 ºC for 50 min each. The …
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Chromosome banding of German cockroach spermatocytes
… stain were examined chromatographically, spectrophotometrically, and for their C-bandinq ability as they aged. Banding failure was accompanied by a rounding of the thiazine spectral peak and the appearance of unknowns with cbromatographic mobility intermediate to azures A and B, and an apparent …
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Mechanisms of terrestrial organic carbon export and preservation in the marine environment
… export, the composition of organic matter, and degradation processes. This thesis uses biomarkers, bulk geochemical tools, and incubation studies to interrogate the factors controlling terrestrial carbon export and preservation in the marine environment. The thesis focuses on two globally …
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Mechanisms of terrestrial organic carbon export and preservation in the marine environment
… export, the composition of organic matter, and degradation processes. This thesis uses biomarkers, bulk geochemical tools, and incubation studies to interrogate the factors controlling terrestrial carbon export and preservation in the marine environment. The thesis focuses on two globally …
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Novel chemical and toxicological studies on textile industry waste streams clean up
… dyes and purify dye house effluents modem photochemical oxidation methods, such as the UV /hydrogen peroxide process, provide an effective treatment technology. Organic contaminants can be completely mineralised by this method but it is relatively expensive. Photochemical oxidation with …
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Immobilising and Interfacing Poly(Heptazine Imide) Ionic Carbon Nitride for Photo(electro)catalytic Fuel and Chemical Production
… towards a carbon-neutral circular economy. Photocatalytic (PC) and photo(electro)catalytic (PEC) systems, based on a semiconductor/liquid electrolyte junction, are capable of converting and storing the energy from the sun into chemical bonds. Over the years, poly(heptazine imide) ionic …
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Step-Growth Polymerization Towards the Design of Polymers: Assembly and Disassembly of Macromolecules
… systems exhibited novel structures, and either photoreactive capabilities, or high performance properties. There is an increasing trend towards the development of photoactive adhesives. In particular these polymers are often used in flip bonding, lithography, stimuli responsive polymers, drug …