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 20 of 29 for “"low-density polyethylene (LDPE)"”.
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Transient Shear Flow Rheology of Concentrated Long Glass Fiber Suspensions in a Sliding Plate Rheometer
… growth measurements at the startup of shear flow were performed on long glass fiber-filled polypropylene. Samples were prepared with fibers pre-oriented either in 1-direction, 3-direction or random in 1-3 plane, where the 1-direction is the direction of shear motion, the 2-direction is …
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Study of Immobilizing Cadmium Selenide Quantum Dots in Selected Polymers for Application in Peroxyoxalate Chemiluminescence Flow Injection Analysis
… (PI), polymethylmethacrylate (PMMA), and low-density polyethylene (LDPE). The combinations of QDs and polymer substrates were evaluated for their analytical fit-for-use in applicable immunoassays. Hydrogen peroxide standards were injected into the flow injection analyzer (FIA) constructed …
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Development of Multi-layer Films Containing Natural Antimicrobial Agents
… the AM coatings were embedded between low-density polyethylene (LDPE) layers to construct multilayer AM films. Investigation of the retention and subsequent release of the AM agent from multi-layer films suggested that a coating layer consisting of ethylacrylatemethylmethacrylate …
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Development of LDPE-based antimicrobial films for food packaging
… evaporation loss of AM agent during the film blowing process. The present study aims at developing effective AM films and subsequently reducing the loss of active AM agents. The effect of polyethylene glycol (PEG) and ethylene vinyl acetate (EVA) in minimising the loss of active AM agent during …
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Micro and nano composites composed of a polymer matrix and a metal disperse phase.
Low density polyethylene (LDPE) and Hytrel (a thermoplastic elastomer) were used as polymeric matrices in polymer + metal composites. The concentration of micrometric (Al, Ag and Ni) as well as nanometric particles (Al and Ag) was varied from 0 to 10 %. Composites were prepared by blending followed …
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Development of Commercial Applications for Recycled Plastics Using Finite Element Analysis
… plastics blends are: pop bottles made of PolyethyleneTeraphthalate (PET), milk jugs made of High-Density Polyethylene (HDPE), Vinyl seats made of Poly Vinyl Chloride (PVC) and small amount of Polypropylene (PP) and Urethane, electronic scrap made of engineering resins like …
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Blade dynamics and flux measurements for model seagrass blades in waves and currents
Complex interactions between flow conditions, blade posture, and mass transport processes, represent a challenge to fully understanding the influence of hydrodynamic conditions on the flux of nutrients to the blade surface of submerged aquatic vegetation. To isolate the physical mechanisms from …
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Development and evaluation of low density polyethylene-based antimicrobial food packaging films containing natural agents
… developed. These agents were incorporated into a low-density polyethylene (LDPE) substrate using the techniques of both compression moulding and extrusion film blowing. Different film formulations containing additive polymers, ethylene vinyl acetate (EVA) and polyethylene glycol (PEG), were …
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Stability of aseptically packaged food as a function of oxidation initiated by a polymer contact surface
In this study, low density polyethylene (LDPE) and polyethylene terephalate (PETE) resin beads were ground to a coarse powder and exposed to sterilization treatments applied to the food contact surface of packaging materials used in aseptically processed and packaged food. Electron paranlagnetic …
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Optimization of hydrophobic meshes for oil spill recovery
… using steel mesh dip-coated in a hot solution of low-density polyethylene (LDPE) in xylene. The mesh gained a rough, hydrophobic coating of LDPE, with tunable pore sizes and surface roughness. The coating was characterized using microscopy techniques and contact angle analysis, in order to …
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Catalytic Degradation of Waste Polymers
… Thermal degradation of polymers usually follows a radical mechanism (which is of high energy and requires high temperatures) and produces a large proportion of straight chain alkanes, which have low relative octane number (RON) and so cannot be used in internal combustion engines. However, a …
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Low density polyethylene sorption of polycyclic aromatic hydrocarbons in aquatic environments and the role of biofilm
… PAH sorption to the highly sorptive plastic, low density polyethylene (LDPE). Results showed levels of PAHs sorbed to LDPE tended to be higher in stream sites than in wetland sites, although the differences were not always significant. This was likely due to external environmental factors at …
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Biosynthesis and characterisation of polyhydroxyalkanoate biopolymers and their oligomers for circular economy
… wastes investigated in this study were oxidised low-density polyethylene (LDPE), LDPE separated from Tetra Pak® waste (PE-T) and [text redacted]. These plastic wastes were supplied directly to Cupriavidus necator for use as potential carbon sources for PHA accumulation in a 48-hour shake flask …
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Metal Complex Photo-activators for the Time-Controlled, Photo-Oxidation of Polyolefins
… and U.V. stabilizer, has been examined in both low-density polyethylene (LDPE) and polypropylene (PP). The U.V. stabilizers used were zinc and nickel diethyldithiocarbamates (ZDEC and NDEC), tetraethylthiuram disulphide (TETD), and 2-hydroxy-4-octyloxybenzophenone (HOBP). The two-component APA …
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Studies of the Evaluation of Solid Phase Dispersants in Polymer Blends
… of recycling mixtures of thermoplastic polymers. Low-density polyethylene (LDPE) and polystyrene (PS) were chosen for this study because of the mechanical properties of these blends. To improve performance, block and graft copolymers of ethylene-styrene as solid phase dispersants (SPDs) were added …
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The antioxidant role of vitamin E in polyolefins
… synthetic hindered phenols, is investigated in low density polyethylene (LDPE) and polypropylene (PP). The melt stabilising effectiveness of -tocopherol (Toc) was found to be very high, higher than that of commercial hindered phenol antioxidants, such as Irganox 1076 (Irg 1076) and Irganox 1010 …
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Optimization processability of ss316l used natural hydroxyapatite from waste tilapia fish bones in metal injection molding
… and combination of NHAP powder bind with Low density Polyethylene (LDPE) and Palm stearin (PS). The results of rheological analysis show feedstocks with 63 and 64 wt.% of powder loading for both 90 wt.% SS316L and 10 wt.% NHAP and 85 wt.% SS316L and 15 wt.% NHAP composites shows a …
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The Accelerated Photo-Degradation of Low Density Polyethylene
… 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, disalicylaldehyde-ethylene-diamine …
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Diffusion and Relaxometry Studies in Mesoporous Systems using Nuclear Magnetic Resonance
… such as the hydroisomerisation of fuels, Low-Density Polyethylene (LDPE) production, and the separation of branched and linear species. Despite the significance of branched species in various daily product-producing chemical processes, more studies are needed on the impact of branching on …
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Analysis of sintered WC-TIC-6CO by using powder metallurgy process
… carbide (TiC) as grain growth inhibitor while low density polyethylene (LDPE) and palm stearin (PS) were used as a binder system. The sample was prepared by milling process consisting of WC-6Co at different wt. % of TiC (0.5, 0.75 and 1.0) before being mixed with binder system. The critical …
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