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Dissertations / Theses on the topic 'Polyethylene Polyethylene Plastics in packaging'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Sheth, Samir A. "Effect of low level radiation on the barrier qualities of spunbounded olefin /." Online version of thesis, 1991. http://hdl.handle.net/1850/11144.

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2

Al-Ati, Tareq. "Oxygen permeation of virgin HDPE films versus recycled HDPE films /." Online version of thesis, 1994. http://hdl.handle.net/1850/11875.

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3

Drucker, Steven M. "The suitability of polyethylene terephthalate copolyester for radiation sterilized dry small volume parenterals /." Online version of thesis, 1993. http://hdl.handle.net/1850/11896.

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4

Yoo, SeungRan. "The effect of high pressure processing on the mass transfer of Irganox 1076 in low-density polyethylene films and in 95% ethanol as a food simulant." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1181749497.

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5

PORTO, KARINA M. B. G. "Efeitos da radiação gama (sup(60)Co) nas principais propriedades físicas e químicas de embalagens compostas por papel grau cirúrgico e filme plástico laminado, destinadas à esterilização de produtos para saúde." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10575.

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Made available in DSpace on 2014-10-09T12:42:08Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:05:09Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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6

Chohan, Sukhvinder K. "Environmental degradation of polyethylene-based plastics." Thesis, Aston University, 1996. http://publications.aston.ac.uk/9675/.

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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 laboratory prepared degradable polymer samples were oxidised in different environments and the oxidation products formed were studied using various analytical chromatographic and spectroscopic techniques such as HPLC, FT-IR and NMR. It was found that commercial degradable polymer samples which are based on

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7

Haunton, Jan. "Butt fusion welding of polyethylene." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332077.

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8

Dumpleton, P. "Fatigue crack propagation in polyethylene." Thesis, Cranfield University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373987.

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9

Zhang, Ai Yang. "Physical property enhancement of polyethylene blends." Thesis, Brunel University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285090.

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10

Holden, P. S. "The diffusion of gases in oriented polyethylene." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355928.

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11

Tang, Zuojian 1967. "Surface morphology of polyethylene blown films." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31072.

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The properties of blown polyethylene (PE) films depend on various factors, including crystallinity, morphology, and orientation, in addition to chemical composition. It has been shown that the optical properties are strongly influenced by surface morphology. In this project, we use non-contact atomic force microscopy (AFM) and polarized light microscopy (PLM) to visualize surface and bulk morphology. Various techniques, such as surface and line roughness, surface and line fractal dimension, pair-correlation function and nearest neighbor distance distribution function, are employed to quantify

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12

Tam, Mei San. "Study of sisal fiber-reinforced polypropylene, polyethylene and polypropylene/polyethylene blend composites prepared by compression molding." access abstract and table of contents access full-text, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175123a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2005.<br>At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.

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13

Leme, Flávio de Oliveira. "Avaliação da espectrometria de emissão óptica com plasma induzido por laser (LIBS) para a análise de embalagens plásticas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-20092012-165925/.

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LIBS é um método baseado na espectrometria de emissão óptica que emprega a microamostragem por ablação por laser e formação de um microplasma para a determinação dos elementos químicos presentes na amostra. Neste trabalho, o método foi avaliado para a análise de embalagens plásticas produzidas com polietileno de alta densidade e polipropileno. A construção de curvas de calibração com amostras dos polímeros contendo diferentes concentrações de Cd, Cr e Pb e a determinação desses analitos, assim como os efeitos da taxa de repetição do laser, número de pulsos, fluência e diâmetro de focalização f

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14

Scarpa, Paulo Cesar do Nascimento. "Polarization and dielectric behaviour of AC aged polyethylene." Thesis, Bangor University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282266.

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15

Raymond, Carole Lesley. "Coatings for magnesium hydroxide fillers in polyethylene compounds." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/26868.

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This study has been carried out to determine the effect of filler coatings on the physical and mechanical properties of medium density polyethylene (MDPE) filled with a fine grade of magnesium hydroxide filler. The filler coatings applied are of varying aliphatic chain length, the shortest being decanoic acid (C1O), and the longest being an acid-terminated PE, Mw=5000g/mol. The other coatings applied were stearic acid (C18), a commonly used coating, and behenic acid (C22). This selection of coatings provided a comparison of the effect of fatty acid chain length, with the acid group of the func

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16

Jumpa, Suparat. "Elongational rheometry and processing of filled polyethylene melts." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/31908.

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A scientific approach to the design of polymer processing operations requires a basic understanding of the rheological behaviour of polymer melts. Since elongational flow has a significant role in many commercially important polymer processes such as fibre spinning, film blowing, and blow moulding, the Rutherford Elongational Rheometer (RER) at Loughborough University was designed to measure the flow behaviour of polymer melts in a uniaxial elongational mode. Modifications have been made to the apparatus and suitable experimental and. sample preparation techniques have been developed to determ

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17

Brues, Michael J. (Michael Jason). "Thermolysis of mixtures of polyethylene and polystyrene." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22642.

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The thermolysis of mixtures of polyethylene and polystyrene was investigated. Overall liquid production for the mixture was above the values predicted from individual polymer reactions. No detrimental effects on the styrene production were evident, as over 50% of the initial polystyrene charge was converted to styrene for polystyrene and for mixtures. There were, however, some differences in the secondary products. No incorporation of one polymer onto another was observed, either in the liquid or the residue.<br>Different reaction conditions were examined. It was determined that using a single

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18

Gao, Ping. "Swelling and drawing behaviour of ultrahigh molecular weight polyethylene." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335714.

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19

Solbai, Samad bin. "The manufacture and properties of high performance polyethylene structures." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305534.

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20

ROMANIELLO, FRANCESCO. "GAINING INSIGHTS IN THE MICROBIAL DEGRADATION OF POLYETHYLENE PLASTICS." Doctoral thesis, Università Cattolica del Sacro Cuore, 2019. http://hdl.handle.net/10280/57898.

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Il polietilene (PE) rappresenta più del 60% di tutte le plastiche derivate dal petrolio a livello mondiale, e si sta accumulando ad un tasso di diversi milioni di tonnellate per anno a causa della sua riluttanza alla degradazione biotica e abiotica. La degradazione microbica è stata proposta come possibile strada alternativa nella riduzione dei rifiuti plastici. Lo scopo generale di questo lavoro è stata l'identificazione di ceppi batterici in grado di metabolizzare il PE e di identificare le vie metaboliche coinvolte in tale processo di biodegradazione. Abbiamo analizzato mediante approccio

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21

HoaÌ€ng, Eric MiÌnh. "Additives interactions in the thermo-oxidative degradation of metallocene polyethylene." Thesis, Manchester Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289422.

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During the 1990's the development of metallocene catalysts has made a dramatic impact on the polyethylene industry. A large amount of work can be found in the literature regarding the degradation and stabilisation of conventional polyethylenes. However, very few studies have been devoted to these novel metallocene polymers. The first part of this thesis deals with the thermo-oxidative degradation of various metallocene polyethylenes (mPE's) in the solid state (oven ageing at 90°C in air) and the melt state (via mastication in air in a Brabender® mixer). For each mPE, essentially one characteri

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22

Barreto, Marie de Chantal. "Crystallisation kinetics of high density polyethylene pre-sheared in the melt." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61763.

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23

Heuzey, Marie-Claude. "The occurrence of flow marks during injection molding of linear polyethylene." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23745.

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Injection molding is a high rate production process for manufacturing plastic parts. There is often a conflict between good appearance and short cycle time. Injection molded parts can show several types of surface defect. It is believed that wall slip may be associated with some types of defect, because wall slip can modify the distributions of velocity, wall shear stress, pressure and heat flux. The work described here involves an experimental study of the occurrence of flow marks during injection molding of linear polyethylene, and the possible relationship between these defects and wall sli

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24

Webber, Robert Stephen. "The strain dependent behaviour of microporous ultra-high molecular weight polyethylene." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263897.

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25

Mohanraj, Jagannathan. "Production and properties of die- drawn toughened polypropylene and polyethylene terephthalate." Thesis, University of Leeds, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250864.

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26

Björnsdotter, Maria. "Leaching of Residual Monomers, Oligomers and Additives from Polyethylene, Polypropylene, Polyvinyl Chloride, High-density Polyethylene and Polystyrene Virgin Plastics." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-45888.

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Plastic debris are accumulating in our oceans and are degraded into smaller pieces which eventually becomes small enough to be available to lower thropic level organisms. Microplastics, commonly defined as plastic particles <5 mm, are globally distributed and found at remote locations far away from industrialized and populated areas. The effects of macro sized plastics is well understood whilst the effects of microplastics is hard to predict. It is known that microplastics act as transfer vectors for a wide range of toxic chemicals into organisms, and it is also known that the particle itse

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27

Huang, Keyuan. "Decrosslinking of Crosslinked Polyethylene via Ultrasonically Aided Extrusion." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1428160856.

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28

Ye, Yufeng 1971. "The study of long time relaxation behavior of metallocene polyethylene /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31081.

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The long time relaxation behavior of linear and long chain branched (LCB) metallocene polyethylene (mPE) is very important for understanding their flow properties. One linear and four LCB mPEs were studied in shear creep and recovery measurements. All the mPEs have similar molecular weight and molecular weight distribution but different levels of long chain branching. A technique was developed to eliminate the effect of non-ideal start-up at the beginning of creep experiment and the small residual stress that exists during the creep recovery period. It is found that the existence of long chain

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29

Tavichai, Orasa. "Effect of shear on growth rates during polyethylene melt crystallization." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33996.

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During processing, polymers are exposed to complex thermal and deformation fields. Under these conditions, partially crystalline polymers undergo crystallization, which contributes significantly to their ultimate properties. While the thermal effects on polymer crystallization have been studied extensively, there is much less research carried out with regard to the effects of deformation and stress on crystallization kinetics. This is in part due to experimental difficulties in making appropriate measurements. In the present work, the Linkam Shearing Cell, in conjunction with a polarized light

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30

Godinho, Jorge Emanuel Martins dos Santos. "Property variations in polyethylene articles produced by a variety of moulding methods." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388089.

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31

Shah, Brinda. "Synthesis of polyethylene/starch hybrids using aqueous mini emulsion polymerization /." Online version of thesis, 2010. http://hdl.handle.net/1850/12265.

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32

Sentmanat, Martin Lamar. "The effect of pressure on the wall slip of linear polyethylene." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39998.

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Experiments were performed on a slit die rheometer to determine the effect of pressure on the wall slip of linear polyethylene. A novel shear stress transducer was developed to measure local wall shear stress at several locations along the die. It was found that above the critical shear stress for the onset of slip, the shear stress distribution along the die was nonuniform. Furthermore, it was discovered that the local wall shear stress near the exit of the die was greater than the nominal, or length-averaged, shear stress within the die as calculated from the pressure drop. Teflon$ sp circle

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33

Samurkas, Tony. "Nonlinear viscoelastic behaviour of linear polyethylene : molecular weight effects and constitutive equation evaluations." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41766.

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The nonlinear viscoelastic properties of a series of blends of linear polyethylene were studied using the McGill sliding plate rheometer. A more reliable and sensitive shear stress transducer for this rheometer was designed, built and used in this work. The molecular weight dependence of a variety of nonlinear viscoelastic properties was investigated. It was determined that, as with steady state properties, the sensitivity of such properties to molecular weight diminishes with increasing shear rate. The behavior of these materials in large amplitude oscillatory shear (LAOS) was also studied. B

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34

Ogbonna, Charles Iroha. "Production of self-reinforced polyethylene using the multi live-feed (injection) moulding technique." Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277646.

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35

Ophir, Amos. "Toughness enhancement of poly(ethylene terephthalate) with chemically modified ultra high molecular weight polyethylene." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/13881.

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The present work was concentrated on exploring and developing a toughening material system to be used in engineering products made of high crystalline PET [poly(ethylene terephthalate)]. The work addressed some fundamental objectives in the technology. of crystallised PET (CPET) related to toughness and thermoforming. PET is widely used in fibres and oriented films but is also an attractive material for moulded products, owing to its high melting point and solvent resistance. Crystalline PET, however, is brittle and susceptible to hydrolytic degradation through water absorption. The polymeric

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36

Beagan, Christina Majella. "The extrusion, performance and characterization of metallocene catalysed polyethylene based packaging films." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322767.

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37

Hikmet, R. A. M. "Studies of adsorption-entanglement layers and high-modulus, high-strength tapes and fibres of polyethylene." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356122.

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38

Kurtulus, Ceren. "Self Reinforcement Of Poly(ethylene Terephthalate) And Polyethylene Blends." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608306/index.pdf.

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In this study, 20/80 (weight %) Poly(ethylene terephthalate) (PET) /High Density Polyethylene (HDPE) Microfibrillar Reinforced Composites (MFC) were prepared by using high density polyethylene (HDPE) as the matrix material, poly(ethylene terephthalate) (PET) as the reinforcing component. Ethylene n-butyl acrylate-glycidyl methacrylate (E-nBA-GMA) and ethylene methyl acrylate (E-MA) as the compatibilizers in 1, 5, and 10 wt. %. The objective of this study is to produce MFCs based on PET and HDPE via extrusion-drawing-injection method and to characterize as extruded, as drawn and injection molde

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39

Gill, Yasir Q. "Preparation and characterization of polyethylene based nanocomposites for potential applications in packaging." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18052.

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The objective of my work was to develop HDPE clay nanocomposites for packaging with superior barrier (gas and water) properties by economical processing technique. This work also represents a comparative study of thermoplastic nanocomposites for packaging based on linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and Nylon12. In this study properties and processing of a series of linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and Nylon 12 nanocomposites based on Na-MMT clay and two different aspect ratio grades of kaolinite clay are discussed.

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40

Konkol, Lidia, and lkonkol77@hotmail com. "Contaminant levels in recycled PET plastic." Swinburne University of Technology. Environment and Biotechnology Centre, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20051025.142051.

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The purpose of this thesis was to determine which contaminants were present in washed and dried shredded poly(ethylene terephthalate) (PET, flake) obtained from curbside collection and to determine whether their concentrations were above the US FDA threshold of 215 ppb. Over thirty semi-volatile contaminants were extracted from the treated flake by Soxhlet extraction using dichloromethane as a PET swelling solvent and gas chromatography-mass spectroscopy for identification and quantification. Soxhlet extraction of flake ground to 0-300 �m was effectively completed by 24 h, whereas sonication r

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41

Joshi, Anup S. "Copolyesters and Terpolyesters of Polyethylene Terephthalate with Renewably Sourced Comonomers for Packaging Application." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1562943452866685.

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42

Al-Fouzan, Abdulrahman M. "Polyethylene Terephthalate / clay nanocomposites. Compounding, fabrication and characterisation of the thermal, rheological, barrier and mechanical properties of Polyethylene Terephthalate / clay nanocomposites." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5283.

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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 will be around 6% in the 2010-2015 period. The rheological behaviour, thermal properties, tensile modulus, permeability properties and degradation phenomena of PET/clay nanocomposites have been investigated in this project. An overall, important finding is that incorporation of nanoclays in PET gives

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43

Capt, Ludovic. "The pressure-volume-temperature behavior and the effect of pressure on crystallization kinetics of polyethylene resins." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0026/MQ50594.pdf.

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44

RODRIGUES, DEBORAH FRANCISCO. "DIAGNOSIS OF THE REVERSE DISTRIBUTION CHANNEL IN RECYCLE OF PLASTICS RESIDUES: POLYSTYRENE AND POLYETHYLENE TEREPHTHALATE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4766@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>O acelerado desenvolvimento tecnológico tem provocado uma obsolescência precoce dos produtos. Com o aumento dos produtos com vida útil cada vez menor, cresce o número de resíduos gerados e chega-se ao esgotamento da capacidade dos sistemas tradicionais de disposição de resíduos. Com isso, alternativas são estudadas para a destinação final dos bens, a fim de minimizar o impacto ambiental gerado pelos mesmos. Aliado a esse aspecto, devem ser consideradas as legislações referentes às questões ambientais e a crescente sensibi

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45

Shao, Susan X. "Application of finite element analysis (FEA) to fiber-reinforced composite of recycled high density polyethelene /." View online, 1993. http://repository.eiu.edu/theses/docs/32211998853201.pdf.

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46

Wang, Bing. "Copper-oxides catalyzed polyethylene depolymerization in a pilot-scale reactor." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1173210030.

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47

MADDALA, PRANAY RAJ REDDY. "Investigation of Polymer packaging films behavior subjected to tension and tearing." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15002.

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The course of polymer film functioning has been a crucial concern in the advent of packaging technology. The thesis project aims towards obtaining an understanding of mechanical properties for a class of these materials, namely LDPE and PET. A constitutive understanding of this behavior in the case of LDPE is acquired through incorporating a plastic stress strain relationship in an iterative approach with focus put on the sensitivity of a few parameters by following a simple linear curve-fit technique in a way that the global as well as the local response are predictable. FE-models also develo

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48

Kodavati, Venkata Seshank, and Devi Prasad Buraga. "Study of Numerical Model Parameters and Crack Tip of a Packaging Materials." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13840.

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Packaging industries widely use Low-Density Polyethylene (LDPE) in manufacturing different types of containers to store the food products. They are difficult to model numerically in order to have similar experimental response. This research deals with the study of numerical material model parameters of continuum LDPE. It is carried out with the help of experiments along with the numerical simulation of LDPE. Study of stress-strain distribution at crack tip and elements close to the tip is carried out in the LDPE material with the pre-existing center crack with varying lengths. By implementing

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49

Xie, Wa. "Surface Topography and Aesthetics of Recycled Cross-Linked Polyethylene Wire and Cable Coatings." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc799512/.

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Our research focuses on re-using a waste a material, cross-linked polyethylene abbreviated XLPE, which is a widely used coating for wires. XLPE is strong and has excellent thermal properties due to its chemical structure - what leads to the significance of recycling this valuable polymer. Properties of XLPE include good resistance to heat, resistance to chemical corrosion, and high impact strength. A wire is usually composed of a metal core conductor and polymeric coating layers. One creates a new coating, including little pieces of recycled XLPE in the lower layer adjacent to the wire, and vi

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50

Mathews, Eric B. "Prediction and classification of organoleptic quality of high density polyethylene resin by means of multivariate statistical analysis of volatile organic compound profiles." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1601317.

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<p> High Density Polyethylene (HDPE) is a commonly used polymer for food and beverage packaging, but tends to have issues with plastic off-taste. Current industry practice for monitoring and controlling taste quality of HDPE packaging involves sensory analysis by a panel of human analysts. This method of data collection is time consuming, labor intensive, and subjective. As an alternative, multivariate statistical methods may be used to correlate volatile organic compound profiles of HDPE packaging to organoleptic quality of the material. </p><p> This study explores the use of multiple li

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