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 85 for “"Low-density polyethylene"”.
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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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Space charge measurement and analysis in low density polyethylene films
… contributes to the measuring of space charge in low density polyethylene using PEA.<br/>From the experiments to study space charge formation and distribution at the interface on multi-layer sample under DC and AC applied voltage, electrode materials and frequency are determined as two important …
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A STUDY OF THE ROTATIONAL MOULDING OF LINEAR LOW DENSITY POLYETHYLENE
… by studying the rotational moulding of linear low density polyethylene, and to thus contribute to the optimisation of the process. A test moulding was selected as the standard. It was established that the heating cycle of the moulding can be divided into three well defined phases; mould …
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Investigation on the Morphology of Charge-Transfer Complexes in Low Density Polyethylene
… shapes via simple fabrication processes and at low loading levels. In this study, the effect of tetrathiafulvalene (TTF) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) CTC crystallites of various shapes and sizes on composite mechanical properties was investigated in an LDPE (low density …
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The effects of crosslinking byproducts on the electrical properties of low density polyethylene
Crosslinked polyethylene (XLPE) is widely used for high voltage insulation in power transmission systems. However, it has been found that, after crosslinking with Dicumyl Peroxide (DCP), the crosslinking byproducts such as acetophenone, ?-methylstyrene and cumyl alcohol have a significant influence …
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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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An investigation into the relationship between processing, orientation and properties of low density polyethylene films
… of LDPE, LLDPE and blends of LDPE and LLDPE blown films was studied.The results were analysed by relating the change in mechanical properties with the change in the residual strain of manufactured film. The residual strain was measured by using a shrinkage method.
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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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Influence of surface roughness and sliding speed on the friction and wear of low density polyethylene
… roughness and sliding speed on the wear mode of low density polyethylene was studied with multipass experiments at the high sliding speeds by the use of a pin-on-disk wear machine. Surface roughness was found to be the major parameter in determining the wear mode of the polymer at two different …
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A laboratory investigation on the shear strength characteristics of soil reinforced with recycled linear low-density polyethylene
… an investigation into the use of recycled Linear Low-Density (LLDPE) as reinforcement in Cape Flats sand. To understand the implication of the main aim of the investigation, a review of literature on soil reinforcement theory, various forms of reinforcement material and previous studies was …
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On the Melting and Crystallization of Linear Polyethylene, Poly(ethylene oxide) and Metallocene Linear Low-Density Polyethylene
… and series of narrow molecular weight linear polyethylene and poly(ethylene oxide) fractions were studied using a combination of ultra-fast and conventional differential scanning calorimetry, optical microscopy, small angle X-ray scattering, and wide angle X-ray diffraction. In the case of …
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Quantitative Analysis of Additives in Low Density Polyethylene Using On-line Supercritical Fluid Extraction /Supercritical Fluid Chromatography
… and the recoveries are significantly lower than 90%. In recent years, analysis with supercritical fluids (SFs) has emerged as an alternative analytical technique because SFs afford higher diffusivity and lower viscosity. In this research, an on-line Supercritical Fluid Extraction …
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Processing, structure and thermo-mechanical properties of reclaimed nanoclay, and its application in polyamide 6 and low-density polyethylene nanocomposites.
… behaviour and mechanical performance. This is followed by a detailed characterisation of OBM waste to determine elemental composition, and structural and thermal properties. To evaluate their performance as a filler in polymer composites, both mechanical and thermal properties of polyamide 6 (PA6) …
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Characterization and optimization of polyethylene blends
Several series of polyethylene (PE) blends were prepared where one component is a conventional PE and the second is a conventional linear low-density polyethylene (LLDPE) or a metallocene-catalyzed LLDPE. A two-step isothermal annealing (TSIA) procedure is developed enabling the satisfactorily …
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Thermorheology and processing of polyethylene blends : macromolecular structure effects
… and processing behavior of a number of linear low-density polyethylene(LLDPE)/low-density polyethylene (LDPE) blends was studied with emphasis on the effects of long chain branching. First, a linear low-density polyethylene (LL3001.32) was blended with four LDPE's having distinctly different …
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Migration of additives from thermoplastic polymers
… the concentration of these stabilisers in low density polyethylene films and concentration of these stabilisers in low density polyethylene films and in relevant solvents by ultra-violet/visible spectroscopy. Intrinsic diffusion coefficients, equilibrium solubilities, volatilities from LDPE …
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Melting of polymers
… viscous heating in the heating (and melting) of low density polyethylene. A model system was used in order to simplify the mathematical analysis. A theory was developed to describe both processes in the model apparatus. The results showed large differences between the experimental and predicted …
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Analysis of volatile organic compounds (VOCs) in soil via passive sampling : measuring partition and diffusion coefficients
… places it underground for a period of time to allow the VOCs to diffuse into the absorptive materials. In this report, I use low density polyethylene (PE) as the absorptive material and determine two key parameters for passive sampling: the PE-water partition coefficient (Kpew) and diffusion …
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