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 97 for “"polyethylene terephthalate"”.
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Degradation studies on recycled Polyethylene terephthalate
This project aims to investigate the influence of UV on the properties under natural and artificial weathering. The real-time outdoor weathering exposures provide the most accurate results but, they are very slow and manufacturers cannot afford to wait in order to see if a new or improved product …
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A reactive melt modification of polyethylene terephthalate
… structural and chemorheological modification of polyethylene terephthalate in the melt phase with low molecular weight multifunctional glycidyl compounds as reactive additives. Polyethylene terephthalate undergoes chain extension and/or branching reactions with the additives that result in …
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Physical ageing in semi-crystalline polyethylene terephthalate
… has been, as far as research shows, no work on Polyethylene Terephthalate (PET) and the effects ageing can have on this polymer. Two sets of testing were performed, the first on a Thermo-mechanical Analyser (TMA) and the second on a Differential Scanning Calorimeter (DSC). The glasstransition …
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Morphology and Properties of Amorphous Polyethylene Terephthalate
Physical and mechanical properties of amorphous polyethylene terephthalate (PET) have been measured. A uniform morphology was observed when PET thin film (ca. 1000 (ANGSTROM)) was ultraquenched from above its equilibrium melting temperature. Sufficiently rapid quenching rate below T(,g) and heating …
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Performance Characteristics of Polyethylene Terephthalate (PET) Modified Asphalt
<p>Polyethylene terephthalate (PET) plastic is utilized primarily in food and beverage packaging. Although a portion of waste PET is recycled, the majority of the waste is buried in landfills. Therefore, the use of ground PET particles in asphalt may provide an environmentally friendly solution for …
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Polyethylene Terephthalate / clay nanocomposites. Compounding, fabrication and characterisation of the thermal, rheological, barrier and mechanical properties of Polyethylene Terephthalate / clay nanocomposites.
Polyethylene Terephthalate (PET) is one of the most important polymers in use today for packaging due to its outstanding properties. The usage of PET has grown at the highest rate compared with other plastic packaging over the last 20 years, and it is anticipated that the increase in global demand …
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Characterization of polyethylene terephthalate, cellulose acetate and their blends
… and acid/base specific interactions, of polyethylene terephthalate (PET), cellulose acetate (CA) and their blend. Dynamic Contact Angle (DCA) measurements are performed to obtain the surface free energies of PET and CA so that they can be compared to that from IGC. Moreover, the DCA data …
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Heterogeneous crystallisation of polyethylene terephthalate. A study of the influence of organic and inorganic additives on the rate of crystallisation of polyethylene terephthalate and the subsequent changes in morphology and mechanical properties.
The effect of various inorganic and organic additives as possible nucleating agents on the crystallisation behaviour of P. E. T. and the suosequent influence on the morphological and mechanical properties has been examined. Various methods of mixing(: the polymer and additive were investigated and …
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Influence of Polyolefin Contamination on the Thermal Characteristics of Bottle Grade Recycled Polyethylene Terephthalate
During the mechanical recycling, especially during the sorting and separation process of bottle grade PET, cross contamination with polyolefin is inevitable. Very small number of polyolefin bottles, caps and closures pass through the separation process and get recycled with PET bottles and affect …
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High density polyethylene (HDPE) containers as an alternative to polyethylene terephthalate (PET) bottles for solar disinfection of drinking water in northern region, Ghana
… the technical feasibility of high density polyethylene (HDPE) containers as an alternative to polyethylene terephthalate (PET) bottles for the solar disinfection of drinking water in the Northern Region of Ghana, in a process know as SOLAIR. This study is in line with the intention of Pure …
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Rheological characterizaton, and the development of molecular orientation and texture during flow for a liquid crystalline copolymer of para- hydroxybenzoic acid and polyethylene terephthalate
… a copolyester of para-hydroxybenzoic acid and polyethylene terephthalate, and an anisotropic solution of 12 weight% Kevlar in 100% sulfuric acid. It was found that in the case of the copolyester system, the steady shear and dynamic viscosities were equal over certain temperature ranges. For …
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Antimony and acetaldehyde migration from Nigerian and British PET bottles into water and soft drinks under typical use conditions. Concentration of migrants and some trace elements in polyethylene terephthalate and in bottled contents.
Polyethylene terephthalate (PET) is an excellent material for bottling water, beverages, edible oils and other liquids because it is light, tough and transparent. PET bottles are also extensively reused for storage of drinking water, beverages and other liquids and for solar disinfection of …
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Morphology, Crystal Structure, Phase Transitions and Blend Compatibility of Thermotropic Liquid Crystal Terpolyesters
… of P7 and P7-X in binary blends with polyethylene (PE), polyethylene terephthalate (PET), and nylon 6 (Ny6), was examined to evaluate the effect of the aliphatic segment in promoting good adhesion at the interphase. Partial compatibility was observed for PE blends, while miscibility …
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Low Dose, Low Disturbance: PET and PLA Microplastics Show Limited Effects on Soil Microbes via PLFA Analysis
… and other parameters. Polylactic acid (PLA) or polyethylene terephthalate (PET) powders were added to the soil to achieve a mass concentration of 0.7% and 0.6% w/w plastic to soil, respectively. This concentration was selected to be representative of pristine or natural environments rather than …
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Mechanical characterization of BAAM extruded rPET: impact of screw speed and methods for measuring Young’s modulus
… growth in plastic production and consumption. Polyethylene terephthalate (PET), a commonly used plastic, presents particular challenges due to its widespread application in various industries, ranging from food and liquid packaging to electronics and automotive parts. Despite its versatility, …
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Transport properties of synthetic nanopores
… made with two different materials: silica and polyethylene terephthalate. For simulated silica nanopores, the lack of suitable force fields to represent the interactions of the silica with other molecules in solution is a mayor problem. To address this problem, a novel silica force field was …
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Engineering of Saccharomyces cerevisiae for renewable production of plastic precursor chemicals from plant biomass
… glycol (MEG), a precursor chemical of polyethylene terephthalate (PET) plastics, by using yeast Saccharomyces cerevisiae as biosynthesis platform. During the process, we found evidence for the existence of an endogenous biosynthetic route for MEG production from D-xylose in S. …
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An experimental investigation of the effect of slit length on the bursting strength of film and fabric plastic cylindrical shells
… presented to determine the bursting strength of polyethylene terephthalate film and fabric cylinders containing axial silts of various lengths. The results demonstrate that the fabric material is superior to the film material as regards residual strength in the presence of a slit. It is shown …
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In-line measurement of solibility of physical blowing agents in thermoplastic melts as related to extrusion foaming
… methods. Solubility data of the same gases in polyethylene terephthalate have also been generated. To the author's knowledge, solubility data for this system at melt temperatures are not currently available in the literature. Data obtained from the twin-screw extrusion experiments show much …
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