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 525 for “"plastics"”.
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Re-usability of plastics
… to learn more about the quality of recycled plastics when compared to new material. The study was carried out by researching and learning about how the recycling process operates. Further research was then conducted on the seven different types of resins that exist in the recycling world …
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Integrated analyses in plastics forming.
… made in the analysis, simulation and testing of plastics forming. This progress can be applied to injection and compression mould design. Three activities of plastics forming have been investigated, namely filling analysis, cooling analysis and ejecting analysis. The filling section of plastics …
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High-throughput Photodegradation of Plastics
… the rate of abiotic degradation of different plastics using a high throughput photo-reactor, to better understand the rate at which plastic will degrade due to ultraviolet light exposure based on polymer type and properties. The research findings suggest that the photo-degradability of …
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An industrialized house of plastics
Thesis (M.Arch.) Massachusetts Institute of Technology. Dept. of Architecture, 1953.
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Advancing plastics reutilization via catalytic hydroconversion
Plastics have become ubiquitous in modern life, leading to global plastic production of 460 Mt in 2019, which is expected to triple by 2060. However, 99% of all plastic waste has been disposed of via dead-end methods (i.e., incineration, landfills, and the environment). Alternative strategies must …
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Common plastics degradation in coastal environments
… the main factors influencing the degradation of plastics are the type of polymer, abiotic processes, and biotic factors. Photodegradation, thermal degradation, oxidative degradation, hydrolytic degradation, and mechanical disintegration contribute to abiotic degradation; while biodegradation is a …
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Aspects of Adhesion of Metallised Plastics.
Electroplating of a range of ABS plastics has been studied with particular reference to aspects of metal to polymer adhesion. Certain acetylacetonate transition metal complexes have been shown to promote adhesion of copper to ABS, and mechanisms for their action have been postulated. Alternative …
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Environmental degradation of polyethylene-based plastics
The criteria involved in the degradation of polyethylene-based degradable polymer samples have been investigated, with a view to obtaining a clearer mechanism of photo-biodegradation. The compatibility of degradable polymer samples during materials recycling was also studied. Commercial and …
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Process monitoring for plastics injection molding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993 and Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1993.
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Electro-optical method of distinguishing recyclable plastics
… different types of waste. However, not all plastics can be recycled by the council currently. The aim of this project is to develop a device that can distinguish between the different types of plastic which can be and cannot be recycled with the help of an infrared spectrometer. Different …
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Structure-property relationships in extruded plastics foams
Physical properties and morphology of extruded semicrystalline polymers can be significantly affected by modification and change in die design and melt viscosity of the molten polymer. Further modifications to physical properties (i.e. density and open cell fraction) of foamed material occur, …
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Technical cost modeling of plastics fabrication processes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1987.
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Incorporating Recycled Plastics in Asphalt Binders and Mixtures
… the amount of plastic accumulating in landfills. Plastics have been tested in pavement materials as binder modifiers, binder replacement, and aggregate replacement or additive. Due to plastics' plastomeric nature, the addition of plastic makes the asphalt binder and asphalt mixture stiffer - the …
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An integrated approach to managing single-use-plastics
Submitted in fulfilment of the requirements of the Degree Master of Philosophy: Quality, Durban University of Technology, Durban, South Africa, 2024.
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Numerical simulation of the plastics injection moulding process
The Hele-Shaw formulation is widely used for the simulation of the injection moulding process. The influence of the Hele-Shaw approximations is, however, unknown. A two-dimensional numerical model based on the Hele-Shaw formulation, and a model based on the Navier-Stokes equations without the …
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A Systems Approach to Ocean Plastics Governance in Ghana
… by a systems thinking approach, to examine ocean plastics from a governance perspective in Ghana. The findings reveal that ocean plastic pollution is an emerging problem in Ghana with limited national attention. It also reveals low visibility for the problem of ocean plastics in national policies, …
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Implementation of Composites and Plastics Materials for Vehicle Lightweight
… works revealed that composites and thermoplastics materials can deliver better performances under static and crashing load conditions. Using those materials, considerable amount of vehicle weight reduction was also achieved by keeping the desired design performance criteria. It is also …
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