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Добірка наукової літератури з теми "Low-density polyethylene films"

Автор: Grafiati
Опубліковано: 10 січня 2023
Оновлено: 28 січня 2023

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Статті в журналах з теми "Low-density polyethylene films"

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Kaneko, Masashi, and Hisaya Sato. "Photosulfonation of Low-Density Polyethylene Films." Macromolecular Chemistry and Physics 205, no. 2 (January 2004): 173–78. http://dx.doi.org/10.1002/macp.200300033.

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Sabetzadeh, Maryam, Rouhollah Bagheri, and Mahmood Masoomi. "Study on ternary low density polyethylene/linear low density polyethylene/thermoplastic starch blend films." Carbohydrate Polymers 119 (March 2015): 126–33. http://dx.doi.org/10.1016/j.carbpol.2014.11.038.

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Opacich, Michael L., and Laurence E. Dowd. "High molecular weight low density polyethylene films." Journal of Polymer Engineering 5, no. 2 (April 1, 1985): 159–72. http://dx.doi.org/10.1515/polyeng-1985-0205.

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Inceoglu, Funda, and Yusuf Ziya Menceloglu. "Transparent low-density polyethylene/starch nanocomposite films." Journal of Applied Polymer Science 129, no. 4 (January 3, 2013): 1907–14. http://dx.doi.org/10.1002/app.38811.

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Ho, Kam, Larry Kale, and Scott Montgomery. "Melt strength of linear low-density polyethylene/low-density polyethylene blends." Journal of Applied Polymer Science 85, no. 7 (June 3, 2002): 1408–18. http://dx.doi.org/10.1002/app.10677.

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Rokbani, Hajer, France Daigle, and Abdellah Ajji. "Long- and short-term antibacterial properties of low-density polyethylene-based films coated with zinc oxide nanoparticles for potential use in food packaging." Journal of Plastic Film & Sheeting 35, no. 2 (January 2, 2019): 117–34. http://dx.doi.org/10.1177/8756087918822677.

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Concerns in food safety and the need for high-quality foods have increased the demand for extending the shelf life of packaged foods. Subsequently, promoting and investigating the development of antibacterial materials for food packaging has become inevitable. Zinc oxide nanoparticles have attracted attention lately owing to their multifunctional properties, especially antibacterial activity. For this study, antibacterial low-density polyethylene films were prepared by coating zinc oxide nanoparticles onto their surface. The low-density polyethylene film antibacterial activity was evaluated toward Gram-positive and Gram-negative bacteria. The scanning electron microscopy images showed that using anhydride-modified low-density polyethylene (LDPE-g-AM) resin permitted improved zinc oxide nanoparticle distribution on the low-density polyethylene film surface, reduced the agglomerate sizes, and reinforced the zinc oxide nanoparticle bonding to the low-density polyethylene film surface. We found that the coated low-density polyethylene films exhibited high antibacterial activity against both strains. The antibacterial tests also proved that the coated films retained their antibacterial efficiency toward Escherichia coli, even after eight months, with a reduction rate higher than 99.9%, whereas for Staphylococcus aureus the antibacterial properties for the linear low-density polyethylene (LLDPE) films decreased at eight months and improved for the LDPE-g-AM films. When the zinc oxide coated films were laminated with neat low-density polyethylene, only the LDPE-g-AM was still active against E. coli provided that the lamination thickness does not go beyond 8 µm. This research demonstrated that the coated low-density polyethylene films have excellent attributes when used as an active coating in the food packaging industry.
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Drummond, Kate M., Jefferson L. Hopewell, and Robert A. Shanks. "Crystallization of low-density polyethylene- and linear low-density polyethylene-rich blends." Journal of Applied Polymer Science 78, no. 5 (2000): 1009–16. http://dx.doi.org/10.1002/1097-4628(20001031)78:5<1009::aid-app100>3.0.co;2-2.

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Alghdeir, Malek, Khaled Mayya, and Mohamed Dib. "Characterization of Nanosilica/Low-Density Polyethylene Nanocomposite Materials." Journal of Nanomaterials 2019 (March 20, 2019): 1–8. http://dx.doi.org/10.1155/2019/4184351.

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Six ratios of nanosilica particles were employed to fabricate low-density polyethylene (LDPE) composites using melt mixing and hot molding methods. Several composite films with different ratios (0.5, 1, 2.5, 5, 7.5, and 10 wt%) of SiO2 were prepared. The obtained composite films were identified and characterized by Fourier-transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-VIS). At a specific mixing ratio, far infrared radiation transmittance was prohibited while the ultraviolet-visible transmittance is allowed; this will be explained in detail. Optical measurements show that the composite films prevent the transmission of IR radiation near 9 μm and allow UV-VIS transmission during sun-shining time. The mechanical behaviour of a nanosilica-reinforced LDPE composite was studied using tensile tests. The addition of 1 wt% nanosilica has successfully enhanced the mechanical properties of the LDPE material.
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Briassoulis, D., A. Aristopoulou, M. Bonora, and I. Verlodt. "Degradation Characterisation of Agricultural Low-density Polyethylene Films." Biosystems Engineering 88, no. 2 (June 2004): 131–43. http://dx.doi.org/10.1016/j.biosystemseng.2004.02.010.

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Ratanakamnuan, Usarat, and Duangdao Aht-Ong. "Photobiodegradation of low-density polyethylene/banana starch films." Journal of Applied Polymer Science 100, no. 4 (2006): 2725–36. http://dx.doi.org/10.1002/app.23048.

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Дисертації з теми "Low-density polyethylene films"

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Xu, Zhiqiang. "Space charge measurement and analysis in low density polyethylene films." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/69927/.

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The growing requirement of reliability for an insulation system gives researchers greater responsibility to investigate new techniques for monitoring and diagnosing dielectrics subjected to an electric field. It is well known that the presence of space charge is one of the important factors causing premature failure of polymeric high voltage cables. Space charge surveillance is becoming the most general applied skill to evaluate polymeric materials, particularly high voltage cables. The well-known pulsed electroacoustic method (PEA), a reliable non-destructive method, gives a reasonable resolution to the concentration of the space charge in the insulation material. My work contributes to the measuring of space charge in low density polyethylene using PEA. 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 factors in measuring the charge injection and distribution; the interface between films acts as a trap for charge carriers, especially for electrons; and positive charge has a high mobility compared to negative charge. Surface potential decay was studied to explain the crossover phenomenon and to find physical mechanism on charge decay of the corona charged film sample. Charge mapping technique (PEA) was successfully introduced to the potential study and it provides an alternative way to investigate charge decay process and allows monitoring charge migration through the bulk of corona charged film. One essential phenomenon, bipolar charge injection, has been first derived from the results of space charge distribution. The advanced PEA measurement system with high rate test and excellent phase resolving capability was designed in the last part of the study. Compared with the old system the new system can provide the enhanced experiment result for fast change situation, which can achieve high-quality diagnosis for the virtual industry situation such as polarity reversal and transient voltage failure.
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GOMES, BRUNA MARIA DA CUNHA. "PRODUCTION AND CHARACTERIZATION OF LOW DENSITY POLYETHYLENE FILMS REINFORCED WITH TIO2 BASED NANOMATERIALS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21691@1.

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Анотація:
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Materiais plásticos são largamente utilizados em nosso dia-a-dia em embalagens, sacos e outros produtos. Este tipo de material é utilizado devido a suas propriedades como baixo custo, fácil processabilidade, baixa densidade, resistência a microorganismos e água, estabilidade química e durabilidade. Devido às duas últimas propriedades, os polímeros apresentam baixa degradabilidade, causando problemas ambientais. Como óxido de titânio (TiO2) tem se apresentado eficiente como fotocatalisador, reforçar plástico com partículas deste material tem sido uma nova maneira de decompor polímeros a céu aberto. Nanotubos de trititanato (TTNT) podem ser tratados para produzir nanomateriais à base de TiO2 com alta atividade fotocatalítica para a degradação de gases poluentes. Desta forma, o presente trabalho tem como objetivo produzir e caracterizar filmes de polietileno reforçados com quatro tipos de nanomateriais à base de TiO2: TTNT sem pós-tratamento (A1), TTNT pós-tratado termicamente a 550 graus Celsius (A5), TTNT pós-tratado com ácido (A11) e, como referência, partículas de óxido de titânio comercial fornecido pela Degussa (P-25). Os filmes foram expostos à luz UV em uma caixa fechada por 350 horas em temperatura ambiente. A degradação foi avaliada por meio da perda de peso do filme ao longo do tempo. Os filmes virgens e fotodegradados foram caracterizados por Difração de Raios-X (DRX), Calorimetria diferencial de Varredura (DSC), Termogravimetria (TGA) e Microscopia Eletrônica de Varredura (MEV). Os filmes com TTNT pós-tratado fotodegradaram mais do que os com TTNT não tratado, mas menos que os que continham TiO2. Este resultado foi parcialmente atribuído à dificuldade de dispersão dos nanomateriais.
Plastic materials are widely used in our daily lives in bags, food packaging and other products and applications. This type of material is used because of properties such as low-cost, easy processability, low density, resistance to water and microorganisms, and chemical stability and durability. Due to the last two properties, polymers show low biodegradability causing enviro nmental pollution. As titanium dioxide (TiO2) has been shown to be an efficient photocatalyst, the mixture of plastic with this material has been proven to be a new and useful way to decompose solid polymers in open air. Trititanate nanotubes (TTNT) can also be used as a route for developing TiO2-based nanomaterials with high photocatalytic activity for degradation of gas pollutants. Thus, the present research aims to produce degradable polyethylene polymer (PE) films composed with four types of TiO2-based nanomaterials: TTNT as synthesized (A1), TTNT with thermal post-treatment at 550 Celsius degrees (A5), TTNT with acid post-treatment (A11), and, as a reference, commercial TiO2 nanoparticles from Degussa Company (P25).The main characterization tool was the weight reduction measurement during the degradation process. The films were exposed to artificial UV light under ambient air for 350 hours. Virgin and degraded filmes where characterized by X-ray Diffraction, UV-Vis absorption, Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM). Films with post-treated TTNT showed stronger degradation than films with non-treated loads, but weaker than films containing TiO2. This result was partially assigned to the poor dispersion of the nanomaterials.
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Azahari, Baharin Bin. "An investigation into the relationship between processing, orientation and properties of low density polyethylene films." Thesis, London Metropolitan University, 1990. http://repository.londonmet.ac.uk/2992/.

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The effect of changing processing conditions on the mechanical properties 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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Bermingham, Siobhan Clara. "The effect of processing parameters on the properties of blown films produced from blends of a low density and a butene based linear low density polyethylene." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282120.

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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 developed in this way are validated with experimental data. An inverse analysis testing validity or usefulness of DIC technique in identifying a material model is done and some discussions are drawn towards this area. A relative numerical study with respect to experimentally obtained global response for tearing of these polymers is done through use of a similar material model developed from tensile tests and the challenges faced in this area have been addressed.
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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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Euzébio, Junior Silvio Hendez. "Influência das ceras orgânicas nas propriedades de filmes tubulares de PEBD." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/186153.

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Анотація:
As poliolefinas, em especial os polietilenos (PE) são materiais poliméricos muito utilizados para a produção de filmes tubulares, sendo um dos materiais mais amplamente empregado na indústria de embalagens flexíveis. Dentre os diversos PE industriais, o polietileno de baixa densidade (PEBD) apresenta propriedades reológicas únicas em comparação aos PE lineares e os de alta densidade. A alta viscosidade e as numerosas ramificações longas encontradas neste polímero influenciam na redução da produtividade quando processados. Aditivos das mais variadas composições são adicionados ao polietileno durante o processo de extrusão tubular a fim de melhorar suas propriedades. Um dos aditivos mais empregados para facilitar o fluxo do fundido para processamento de filmes são as ceras sintéticas, sendo a mais usada a de polietileno oxidado (CP). Na procura de alternativas de cera de fonte orgânica e/ou de fonte natural, o objetivo deste trabalho é avaliar a influência do tipo e teor de cera na processabilidade e propriedades finais de filmes tubulares de PEBD. Foram usados 3 tipos de ceras: CP (cera de polietileno), a carnaúba (CC) e o monoestearato de glicerol (CM), sendo processadas 4 formulações de PEBD/cera nas proporções mássicas de 99,5/0,5; 99/1; 98/2 e 96/4 m/m com os três tipos de cera e comparados com o PEBD sem cera. Os filmes foram caracterizados através de ensaios físicos, ópticos, químicos, térmicos, reológicos e mecânicos. Propriedades ópticas como o brilho e opacidade foram alteradas pela adição das ceras pois um aumento na concentração das ceras aumenta o grau de cristalinidade dos filmes. A cera de carnaúba apresentou amarelamento nos filmes produzidos com maiores concentrações. Resultados deste estudo mostraram que o uso da cera sintética, CP e da natural de carnaúba, aumentam a produtividade do filme tubular de PEBD, sendo o teor ótimo de 1% de cera, sem ter influência significativa na espessura e largura do filme tubular. O uso de agentes de fluxo alternativos de natureza orgânica é viável pois obtiveram resultados similares e superiores ao padrão nos filmes testados.
Polyolefins, especially polyethylenes (PE) are widely used polymeric materials for the production of tubular films, being one of the most widely used materials in the flexible packaging industry. Among the various industrial PE, low density polyethylene (LDPE) has unique rheological properties compared to linear and high density PE. The high viscosity and the numerous long branches found in this polymer influence the reduction of productivity when processed. Additives of the most varied compositions are added to the polyethylene during the tubular extrusion process in order to improve their properties. One of the most used additives to facilitate the flux of melt for film processing is synthetic waxes, the most used being oxidized polyethylene (CP). In the search for organic and / or natural source wax alternatives, the objective of this work is to evaluate the influence of the type and content of wax on the processability and final properties of tubular films of LDPE. Three types of waxes were used: CP (polyethylene wax), carnauba (CC) and glycerol monostearate (CM), and 4 formulations of LDPE / wax were processed in mass proportions of 99.5 / 0.5; 99/1; 98/2 and 96/4 m / m with the three types of wax and compared with LDPE without wax. The films were characterized by physical, optical, chemical, thermal, rheological and mechanical tests. Optical properties such as brightness and opacity are altered by the addition of waxes as an increase in the concentration of the waxes increases the degree of crystallinity of the films. Carnauba wax shows a yellowing in the films produced with higher concentrations. Results of this study showed that the use of synthetic wax, CP and natural carnauba, increase the productivity of the tubular film of LDPE, being the optimal content of 1% of wax, without having a significant influence on the thickness and width of the tubular film. The use of alternative flow agents of organic nature is feasible because they obtained similar and superior results to the standard in the films tested.
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Gupta, Pankaj. "Processing-Structure-Property Studies of: I) Submicron Polymeric Fibers Produced By Electrospinning and II) Films Of Linear Low Density Polyethylenes As Influenced By The Short Chain Branch Length In Copolymers Of Ethylene/1-Butene, Ethylene/1-Hexene & Ethylene/1-Octene Synthesized By A Single Site Metallocene Catalyst." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/30090.

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The overall theme of the research discussed in this dissertation has been to explore processing-structure-property relationships for submicron polymeric fibers produced by electrospinning (Part I) and to ascertain whether or not the length of the short chain branch has any effect on the physical properties of films of linear low-density polyethylenes (LLDPEs) (Part II). Electrospinning is a unique process to produce submicron fibers (as thin as 100 nm) that have a diameter at least two orders of magnitude smaller than the conventional fiber spinning processes based on melt and solution spinning. As a result, the electrospun fibers have a very high specific surface. The research efforts discussed in Part I of this dissertation relate to some fundamental as well as more applied investigations involving electrospinning. These include investigating the effects of solution rheology on fiber formation and developing novel methodologies to fabricate polymeric mats comprising of high specific surface submicron fibers of more than one polymer, high chemical resistant substrates produced by in situ photo crosslinking during electrospinning, superparamagnetic flexible substrates by electrospinning a solution of an elastomeric polymer containing ferrite nanoparticles of Mn-Zn-Ni and substrates for filtration applications. More specifically, it was found that the solution rheological parameters like concentration and viscosity, in addition to molecular weight play an important role in governing the fiber formation during electrospinning of polymer solutions. Furthermore, it was found that fiber formation depends strongly on the solution concentration regime, i.e., at low and dilute concentrations, droplets and beaded fibers were formed whereas uniform fibers were observed to form at a solution concentration greater than at least six times than that of the critical chain overlap concentration, c*, for linear homopolymers of poly(methyl methacrylate) that had molecular weight distributions ranging from 1.03-1.35 (Mw/Mn). In contrast, uniform fibers were observed at ten times the value of c* for the relatively broader molecular weight polymers (Mw/Mn~1.6-2.1). Novel methodologies were developed to in situ photocrosslink the electrospun jet to produce a crosslinked network in the form of a submicron fiber that could potentially be utilized for applications where a high resistance to chemical environments is required. In addition, flexible superparamagnetic substrates were developed by electrospinning a solution of an elastomeric polymer containing magnetic nanoparticles based on "mixed" ferrites of Mn-Zn-Ni where the specific saturation magnetization and the magnetic permeability of these substrates were found to increase linearly with the wt% loading of the nanoparticles. The methodology to simultaneously electrospin two polymer solutions in a side-by-side fashion was developed to produce bicomponent fibers with the rationale that the resulting electrospun mat will have properties from a combination from each of the polymer components. Bicomponent electrospinning of poly(vinyl chloride)- polyurethane and poly(vinylidiene fluoride)-polyurethane was successfully performed. In addition, filtration properties of single and bicomponent electrospun mats of polyacrylonitrile and polystyrene were investigated. Results indicated lower aerosol penetration or higher filtration efficiencies of the filters based on submicron electrospun fibers in comparison to the conventional filter materials. In addition, Part II of this dissertation explores whether or not the length of the short chain branch affects the physical properties of blown and compression molded films of LLDPEs that were synthesized by a single site metallocene catalyst. Here, three resins based on copolymers of ethylene/1-butene, ethylene/1-hexene, and ethylene/1-octene were utilized that were very similar in terms of their molecular weight and distribution, melt rheology, density, crystallinity and short chain branching content and its distribution. Interestingly, at higher deformation rates (ca. 1m/s), the breaking, tear and impact strengths of films based on ethylene/1-hexene and ethylene/1-octene were found to be superior than those based on ethylene/1-butene. While the origin of these differences in mechanical properties with increasing short chain branch length was not fully understood, the present investigation did confirm this effect to be pronounced only at high deformation rates for both the blown and compression molded LLDPE films.
Ph. D.
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Lozay, Quentin. "Conception et caractérisations de matériaux composites nanostructurés à hautes propriétés barrières. Etude films multinanocouches de PE et PA6 chargés de montmorillonite." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR012.

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Les polymères sont utilisés dans de très nombreux secteurs d’activités tels que l’emballage, l’automobile, … car sont dotés de bonnes propriétés mécaniques, thermiques et barrières. Les enjeux économiques et environnementaux poussent le développement vers des matériaux plus performants et allégés. L’objectif de ce travail de thèse visait l’élaboration de films composites multicouches à base de polyéthylène (PE) et de polyamide (PA6) offrant de hautes propriétés barrières aux gaz et à l’eau. Un procédé de coextrusion équipé d’éléments multiplicateurs a permis de réaliser des multicouches de 100 μm d’épaisseur contenant jusqu’à 2049 couches. Deux séries de films PE-liant-PA6 de compositions différentes ont été étudiées. Des argiles (montmorillonites modifiées) ont été incorporées (à 0,5 et 5 wt%) dans les couches alternées de PE et PA6. Les propriétés structurales, thermiques, mécaniques de ces multicouches ont été corrélées aux propriétés de transport. Nous avons observé des effets de confinements sur la nanostratification des films et la cristallinité des polymères et l’impact sur les propriétés barrières. Nous avons montré la complexité des structures multinanocouches impliquant les interphases ainsi que la complexité des mécanismes de transfert. Le modèle en série de prédiction de perméabilité a mis en évidence des améliorations significatives des propriétés barrières aux gaz des couches confinées de PE mais pas à l’eau. L’effet barrière sur l’ensemble des multicouches a été toutefois limité en raison des orientations « on edge » des phases cristallines et des défauts de structure. Le confinement des nanocharges (à 1% v/v) dans les couches de PA6 a permis d’accroître les propriétés barrières des multicouches
Polymers are used in many fields such as packaging, automotive, etc. as they have good mechanical, thermal and barrier properties. Economic and environmental challenges are driving development towards more efficient and lighter materials. The aim of this thesis work was to develop multilayer composite films based on polyethylene (PE) and polyamide (PA6) with high gas and water barrier properties. A coextrusion process with multiplier elements made it possible to carry out 100 μm thick multilayers containing up to 2049 layers. Two series of PE-binder-PA6 films of different compositions were studied. Clays (organo-modified montmorillonites) were incorporated (at 0.5 and 5 wt%) into the alternating layers of PE and PA6. The structural, thermal and mechanical properties of these multilayers have been correlated with the transport properties. We observed confinement effects on nanostratification of films and crystallinity of polymers and the impact on barrier properties. We showed the complexity of the multinanolayer structures involving interphases as well as the complexity of the transfer mechanisms. The serial model for predicting permeability highlighted significant improvements in the gas barrier properties of confined PE layers but in water. The barrier effect on all of the multilayers was, however, limited due to the “on edge” orientation of the crystalline phases and structural defects. The confinement of nanofillers (at 1% v/v) in PA6 layers has made it possible to increase the barrier properties of multilayers
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Steffl, Thomas. "Rheological and film blowing properties of various low density polyethylenes and their blends." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972028625.

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Книги з теми "Low-density polyethylene films"

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Plastics, Shell. Production of film from low density polyethylene. London: Shell, 1985.

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Частини книг з теми "Low-density polyethylene films"

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Poveda, Patricia Negrini Siqueira, Hamilton Magalhäes Viana, and Leonardo Gondim de Andrade Silva. "Behavior of Linear Low Density Polyethylene Films under UV Ageing for Agricultural Application." In Characterization of Minerals, Metals, and Materials 2015, 253–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093404.ch31.

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Poveda, Patricia Negrini Siqueira, Hamilton Magalhães Viana, and Leonardo Gondim de Andrade Silva. "Behavior of Linear Low Density Polyethylene Films under UV Ageing for Agricultural Application." In Characterization of Minerals, Metals, and Materials 2015, 253–58. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48191-3_31.

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Naciri, Jawad, Zhiqiang Hé, Roseann M. Costantino, Liangde Lu, George S. Hammond, and Richard G. Weiss. "Photophysical Approaches to Characterization of Guest Sites and Measurement of Diffusion Rates to and from Them in Unstretched and Stretched Low-Density Polyethylene Films." In Multidimensional Spectroscopy of Polymers, 425–45. Washington, DC: American Chemical Society, 1995. http://dx.doi.org/10.1021/bk-1995-0598.ch025.

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Laha, Soumita Dutta, Kingshuk Dutta, and Patit Paban Kundu. "Biodegradation of Low Density Polyethylene Films." In Handbook of Research on Microbial Tools for Environmental Waste Management, 282–318. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3540-9.ch014.

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With its ever-increasing demand, the enormous production of low density polyethylene (LDPE) is leading to its huge accumulation in the environment. LDPE remains durable and inert to natural degradation and deterioration. This chapter focuses on various microbial effects and approaches on biodegradation of LDPE. Biodegradation takes place through several different strategies, such as assimilation, biodeterioration, biofragmentation, etc. Few microorganisms have so far been isolated which can grow on LDPE. Degradation by microbial enzyme is considered to be one of the most powerful tools to study the biodegradation of LDPE. Some blends and composites of LDPE with natural polymers have been found to be biodegradable; however, their manufacturing is costly. Thorough analysis of the microbial degradation of LDPE helps us realize the overall mechanism involved. In essence, this chapter aims to objectify the in situ biodegradation of LDPE via development of microbial biofilm on the polymer surface.
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Han, Chang Dae. "Tubular Film Blowing." In Rheology and Processing of Polymeric Materials: Volume 2: Polymer Processing. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195187830.003.0012.

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Tubular film blowing has long been used to produce biaxially oriented films using such thermoplastic polymers as low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP). Here, LDPE refers to a polymer that is synthesized by free-radical polymerization under high pressure (Fawcett et al. 1937). The discovery of linear low-density polyethylene (LLDPE) in the 1980s via the Unipol process (Beret et al. 1986; Jones et al. 1985), which uses a low-pressure gas-phase process, has led to additions to the family of tubular blown films during the past two decades. The discovery of metallocene catalysts (Stevens and Neithamer 1991; Welborn and Ewen 1994) in the 1990s further increased the number of LLDPEs that have been used to produce tubular blown films during the last decade. To distinguish LLDPE from LDPE, LLDPE is sometimes referred to as low-pressure low-density polyethylene (LP-LDPE) and LDPE is referred to as high-pressure low-density polyethylene (HP-LDPE) (see Chapter 6 of Volume 1). In this chapter, however, we use the terminologies LDPE and LLDPE. As described in Chapter 6 of Volume 1, LDPE has a high degree of long-chain branching, while LLDPE has short-chain branching with little or no longchain branching. However, the metallocene catalysts apparently allow one to produce LLDPEs having a wide range of side chains, including a certain degree of long-chain branching. The details of the synthetic procedures for producing such a variety of LLDPEs are closely guarded industrial secrets. Biaxially oriented film can be strong and tough in all directions in the plane of the film. As in fiber spinning, the polymer melt exiting from the die flows under a mechanical tension in the direction of flow. However, in the film blowing process, the tube of molten polymer is extended in both the transverse and the axial (machine) directions. Therefore, rheologically speaking, the film blowing process may be treated from the point of view of biaxial elongational flow, whereas the fiber spinning process may be treated from the point of view of uniaxial elongational flow.
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"Biodegradable Polymer Films on Low Density Polyethylene, Modified Chitosan." In Key Technologies in Polymer Chemistry, 35–42. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18033-10.

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Bazunova, M., and R. Akhmetkhanov. "Biodegradable Polymer Films on Low Density Polyethylene and Chitosan Basis: A Research Note." In Materials Behavior, 83–88. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18259-3.

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"Biodegradable Polymer Films on Low Density Polyethylene and Chitosan Basis: A Research Note." In Materials Behavior, 103–8. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18259-9.

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Lu, Jianjun, Baiyi Zhao, and Hung-Jue Sue. "Phase Structure Characterization and Processing-Structure-Property Relationships in Linear Low-Density Polyethylene Blown Films." In Metallocene Technology in Commercial Applications, 111–19. Elsevier, 1999. http://dx.doi.org/10.1016/b978-188420776-1.50016-8.

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Emekli, N. Y., K. Buyuktas, and A. Bascetincelik. "Changings of some physical properties of different low-density polyethylene films during the useful life." In Environmental Science and Information Application Technology, 147–50. CRC Press, 2015. http://dx.doi.org/10.1201/b18559-25.

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Тези доповідей конференцій з теми "Low-density polyethylene films"

1

HU, BY CHEN, and JIAN-WEI YAN. "Synthesis and Characterization of Functionalized Graphene/Low Density Polyethylene Nanocomposite Films." In The 21st IAPRI World Conference on Packaging. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/iapri2018/24445.

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Cheng, Zixia, Jinxing Shi, Ling Zhang, Yuanxiang Zhou, Zekai Lu, and Shaowei Guo. "Space Charge Behavior in AC Electrically Aged Low-Density Polyethylene Films." In 2018 IEEE 2nd International Electrical and Energy Conference (CIEEC). IEEE, 2018. http://dx.doi.org/10.1109/cieec.2018.8745824.

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Rychkov, Andrey, Alexey Kuznetsov, Anna Gulyakova, and Dmitry Rychkov. "Electret Properties of Layered Structures Based on Low Density Polyethylene Films." In 2022 IEEE 4th International Conference on Dielectrics (ICD). IEEE, 2022. http://dx.doi.org/10.1109/icd53806.2022.9863559.

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Kim, Ick-Chan, Egidio (Ed) Marotta, and Skip Fletcher. "Thermal Joint Conductance of Low Density Polyethylene and Polyster Polymeric Films: Experimental." In 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-760.

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Cheng, Q., and K. Komvopoulos. "Nanomechanical Properties of Fluorocarbon Films Grafted Onto Plasma-Treated Low-Density Polyethylene Surfaces." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71224.

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Fluorocarbon (FC) films were grafted on low-density polyethylene (LDPE) by a plasma polymerization and deposition process. Nanoscale indentation and friction tests performed with a surface force microscope provided insight into the nanomechanical properties of the grafted FC films. The time-dependent deformation behavior of the FC films is examined in the context of nanoindentation responses. It is shown that plasma treatment modified the surface properties of LDPE significantly.
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Rychkov, Andrey, Valery Stojharov, Alexey Kuznetsov, and Dmitry Rychkov. "The Influence of Recrystallization Regimes on Electret Charge Stability in Low-Density Polyethylene Films." In 2018 IEEE 2nd International Conference on Dielectrics (ICD). IEEE, 2018. http://dx.doi.org/10.1109/icd.2018.8468349.

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Rychkov, Andrey, Valery Stojharov, Alexey Kuznetsov, and Dmitry Rychkov. "The Influence of Recrystallization Regimes on Electret Charge Stability in Low-Density Polyethylene Films." In 2018 IEEE 2nd International Conference on Dielectrics (ICD). IEEE, 2018. http://dx.doi.org/10.1109/icd.2018.8514638.

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8

Xu, Z., L. Zhang, and G. Chen. "Measurement and analysis of electric potential decay in corona charged low-density polyethylene films." In 2007 IEEE International Conference on Solid Dielectrics. IEEE, 2007. http://dx.doi.org/10.1109/icsd.2007.4290849.

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Podzorova, M. "Effect of UV-Irradiation and Ozone Exposure on Thermal and Mechanical Properties of PLA/LDPE Films." In Modern Trends in Manufacturing Technologies and Equipment. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901755-14.

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Abstract. The mechanical properties of polymer composites based on polylactide vary significantly over a wide range of values. It has been established that photodegradation of low-density polyethylene – polylactide blends occurs both in the amorphous and in the crystalline phase of the PLA matrix, which leads to deterioration of the mechanical properties of the studied mixtures. Ozonolysis affects the strength parameters of polylactide-polyethylene samples as well as photodegradation. By the differential scanning calorimetry it is determined that the melting point of polylactide decreases by 2-4 °C, the glass transition temperature - by 1-3 °C, while the degree of crystallinity increases by 3-6%. In the process of ozonolysis, the thermophysical characteristics of PLA/LDPE have changed.
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10

Bowman, Andrew, Michael Roth, William Lawrimore, and John Newman. "Graphene Confined Polymer Thin Films Subjected to Supersonic Impact." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-68457.

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Abstract Due to their high specific penetration energy and high-strain-rate dependence, polymers are good candidates for lightweight protection against high-velocity impacts. Recent micro-impact experiments have shown enhanced abilities of polymer thin films to absorb remarkable amounts of energy during ballistic impacts. However, in situ observation of the molecular energy dissipation mechanisms is difficult or impossible, resulting in a gap in understanding. During confinement, the critically connected relationship between chain mobility, temperature, and pressure becomes more enigmatic as shock waves travel through the material. In this work, we use large-scale Molecular Dynamics (MD) simulations with reactive bond-breaking capabilities to gather insights into the nanoscale energy dissipation mechanisms of unconfined and confined polymers. Multi-layered graphene (MLG) sheets are used to create various MLG-polyethylene (PE) configurations, such as a PE with an MLG backing layer, and confined PE sandwiched between graphene. By varying the number and configurations of PE and MLG layers, the level of confinement on the PE can be increased. The resulting PE thin films, graphene films, and confined PE composites are subjected to a range of high-velocity impacts (500–7,500 m/s) to determine the amount of energy dissipation for the given material system. Unconfined PE experiences large void formation and chain pullout due to high entanglement density and low internal chain friction (small monomeric friction coefficient). With increasing levels of confinement, the energy dissipation mechanism transitions from chain disentanglement to chain scission, subsequently dissipating higher amounts of energy.
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Звіти організацій з теми "Low-density polyethylene films"

1

Cameron, Arthur, Shimshon Ben-Yehoshua, and Rebecca Hernandez. Design and Function of Modified Atmosphere Packaging Systems for Fresh Produce: a Unified Approach for Optimizing Oxygen, Carbon Dioxide and Relative Humidity. United States Department of Agriculture, January 1996. http://dx.doi.org/10.32747/1996.7613019.bard.

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Oxygen uptake, CO2 production and respiratory quotient (RQ) of strawberry, raspberry and cherry were measured as functions of temperature and oxygen level. The effect of cultivar was studied in strawberry ('Honey' and 'Allstar'). The effect of harvest date was studied for raspberry. The lower O2 limit increased markedly with incraqsing temperature for all fruits studied. Red bell pepper O2 uptake was measured as a function of O2 at 20o C. Lowering the inpackage humidity using NaCl reduced decay of bell pepper sealed in low-density polyethylene packages when stored at 8o C. Analyses of a model developed for MA-packaged red bell pepper fruit demonstrated that when RQ was near one and when CO2 exceeded O2 permeability, transient CO2 levels increased to a maximum before dropping to steady-state levels. An isothermal model of O2, CO2 and water vapor exchange in MA packages was developed for red bell pepper and tested empirically. A comprehensive model was developed for small fruits that also incorporated water vapor and the effects of changing temperature. Variation in package O2 levels was measured and modeled as a function of variation in respiration and film permeability.
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