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 106 for “"high density polyethylene"”.
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Market development for recycled high density polyethylene (HDPE)
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1990.
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Recycling of crosslinked high density polyethylene through compression molding
Crosslinkable high density polyethylene (XHDPE) is used to manufacture large and rigid products such as fuel tanks using a rotomolding process. Currently, defective and post-consumer parts are not recycled and sent to landfills. Hence, recycling of this material through compression molding is the …
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Ballistic impact resistance of fiber-reinforced high density polyethylene
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1980.
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Particulate starch, its effects as a filler in high density polyethylene
… Results are here reported on starch-filled high density polyethylene which reveal reinforcement effects of starch on the thermoplastic. This significant development makes starch a most promising organic filler. This work is primarily a study of the mechanical and thermal properties of …
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Morphology and Mechanical Properties of High Density Polyethylene Exposed to Chlorinated Water
High density polyethylene (HDPE) is often used in applications that include both structural loads and oxidative environmental conditions. In this study, the effect of an oxidative environment on HDPE morphology and mechanical performance is evaluated. Extruded thin 70 micron HDPE samples …
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Preparation and properties of micro- and nanocomposites based on high density polyethylene
… behaviour of micro- and nanocomposites based on polyethylene (PE) produced by melt mixing. To achieve these objectives, different fillers were considered: micrometric copper particles, nanometric carbon blacks (CBs) and multiwalled carbon nanotubes (MWCNTs). In the first part of this …
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Modulation of Hydroxyl Radical Reactivity and Radical Degradation of High Density Polyethylene
… reviewed herein is the literature concerning high density polyethylene (HDPE) degradation. Exposure to treated water systems is known to greatly reduce the lifetime of HDPE pipe. While there is no consensus on what leads to HDPE breakdown, evidence suggests oxidative processes are at play. The …
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Incorporation of Polar Comonomers Into High Density Polyethylene With a Cyclopentadienyl-Amido Titanium Catalyst
… equivalents of MAO and two different solvents. Higher catalytic activities were correlated with fewer equivalents of polar comonomer, lower temperatures, and no fewer than 1000 equivalents of MAO. Toluene was found to be a far more effective reaction solvent than dichloromethane, as polymer …
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Experimental study of shear behaviour of high density polyethylene reinforced sand under triaxial compression
… to investigate the reinforcing effect of High-Density Polyethylene (HDPE) plastic material in Cape Flats sand, predominant in the Western Cape region of South Africa. Plastic strips of various lengths were randomly included to the soil at different concentrations to form a homogenous …
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Mesostructuring of SiCN Materials and Catalysts via Microphase Separation Technique utilizing High-Density Polyethylene Blocks
… this thesis is to utilize the hydroxylterminated polyethylene (PE-OH)produced via Ziegler’s “Aufbaureaktion” for the synthesis of 1) porous polyethylene templates for the synthesis of structurally inverted porous SiCN (siliconcarbonitride) 2) SiCN mesomaterials using PE-OH as porogen 3) porous …
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Thermochemical conversion of high-density polyethylene (HDPE) to value-added products using cobalt-based catalysts
… concerns for the environment and society. High-density polyethylene (HDPE) covers 13% of the total waste plastic. Pyrolysis is a thermochemical method of treating plastic thermally under an inert atmosphere to convert HDPE into valuable products, such as wax, oil, gas, and char. The current …
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An assessment of the performance of high density polyethylene copolymers for natural gas distribution pipes
… PVC and polyolefins pipe by 1985. By that time, polyethylene for gas distribution pipe and fittings will represent some 30% of the total polyethylene pipe market. The performance characteristics of a high density polyethylene are significantly influenced by both molecular weight and type of …
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Processing and properties of composites based on high density polyethylene and thermotropic liquid crystalline polymers
… the processing and properties of composites of high density polyethylene (HDPE) and thermotropic liquid crystalline polymers (TLCPs). Strands of HDPE reinforced with TLCPs were generated using a novel dual extruder mixing technique. It was shown that the strength and modulus of the strands …
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Some adsorption/contamination phenomena observed in dilute trace element solutions stored in high-density polyethylene containers
… test whether the locally-produced Polykan 57/500 high-density polyethylene containers were suitable for the storage of aqueous trace element samples which were to be collected in the Karroo Uranium Groundwater Hydrogeochemical Prospecting Project.
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The Effect of Matrix Molecular Weight on the Dispersion of Nanoclay in Unmodified High Density Polyethylene
… montmorillonite (MMT) in non polar, unmodified high density polyethylene (HDPE) was examined. Polymer layered silicate (PLS) nanocomposites were compounded using three unmodified HDPE matrices of differing molecular weight and an organically modified MMT in concentrations ranging from 2 wt% to 8 …
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Studies of Environmental Stress Cracking of High Density Polyethylene Liner in Alkaline Surfactant Polymer Enhanced Oil Recovery Floods
… oil reservoirs. With the increasing use of high density polyethylene (HDPE) pipes in EOR process, environmental stress cracking (ESC) poses a threat to the integrity of the pipe in ASP floods. In this research, the ESC behaviour of HDPE pipes was studied in ASP floods under conditions that …
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