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Dissertations / Theses on the topic 'LDPE'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Mizutani, Teruyoshi, Kenta Shinmura, Kazue Kaneko, Tatsuo Mori, Mitsugu Ishioka, and Tatsuya Nagata. "Space Charge Behavior near LDPE / LDPE Interface." IEEE, 2000. http://hdl.handle.net/2237/7162.

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2

Cömert, Engin. "Utvärdering av karboniserad LDPE som egenskapsförbättrande tillsats i nya LDPE-filmer." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240303.

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Tidigare forskning har visat att med hjälp av en speciell mikrovågsugn så kan man omvandla lågdensitetspolyeten (LDPE) till kemikalier med högre värde [1]. Ett försök på att omvandla plastavfall (LDPE) till en produkt med högre värde kommer att göras i detta projekt. Att kunna återvinna plast är en fråga som under de senaste åren har växt och fortsätter växa, i dagsläget så finns det ett intresse att kunna producera nya produkter från återvunnet material [2]. Eftersom plaster succesivt förlorar sina egenskaper varje gång de värms upp så är det ofta enklare för ett företag att skapa och använda

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3

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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4

Riess, Katrin. "Plasmamodifizierung von Polyethylen." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961745886.

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5

Andersen, Bistra. "Investigations on environmental stress cracking resistance of LDPE/EVA blends." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972520481.

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6

Olyveira, Gabriel Molina de. "Preparação e caracterização de nanocompósitos de LDPE e LDPE/EVA com partículas de Ag/TIO2 para aplicações antimicrobiais." Universidade Federal de São Carlos, 2009. https://repositorio.ufscar.br/handle/ufscar/854.

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Made available in DSpace on 2016-06-02T19:12:16Z (GMT). No. of bitstreams: 1 4053.pdf: 8216235 bytes, checksum: b8c4e5fc95b54ea1be8c08a4d82e49cc (MD5) Previous issue date: 2009-10-02<br>Universidade Federal de Sao Carlos<br>This study investigated the use of a charger inorganic (titanium dioxide) as a support for silver nanoparticles and evaluated the use of material obtained as filler in polymer for antimicrobial application.Silver nanoparticles-titanium dioxide were synthesized by the reduction method developed by Turkevich, also known as a method of citrate. Therefore, we used three diffe

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7

Hendry, Benjamin H. "Evaluation of post-residential LDPE recycling in Georgia." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/28817.

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8

Chalapati, Sachin. "Toluene Mediated FCC of LDPE Using Ionic liquids." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17973.

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Polyethylene is one of the most widely used synthetic materials produced by mankind and its accumulation in the biosphere is exceeding at an alarming rate. There are several methods to recycle or remediate the waste polyethene apart from land filling and generation of useful products from the waste is on demand for research and development. Ionic liquids are aggressively replacing several organic compounds due to their robust nature and also have novel properties that allow depolymerization of synthetic materials into simpler short chained paraffins. Initial dissolution of polymer using hot to

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9

Rabie, Allan John. "Blends with low-density polyethylene (LDPE) and plastomers." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49870.

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Thesis (MSc)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: This study describes the design, building and optimization of a fully functional preparative TREF (Prep-TREF) apparatus. This apparatus allows for the fractionation of semicrystalline polyolefins according to the crystallizability of the molecules. Various factors, such as the sample cooling rate and the effect of on-support and off-support crystallization, are investigated. The preparative TREF is used to fractionate a commercial low-density polyethylene (LOPE), two commercially available plastomers (polyethylene-l-octen

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10

Zhang, Chao, Teruyoshi Mizutani, Kazue Kaneko, Tatsuo Mori, and Mitsugu Ishioka. "Space charge and conduction in LDPE-polypropylene copolymer blends." IEEE, 2001. http://hdl.handle.net/2237/7163.

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11

Lee, David Shu Chung 1970. "Rheological characterization of LDPE and PMMA with optical methods." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/9963.

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12

Fries, Sebastian [Verfasser]. "Modelling of Fouling Mechanisms in the LDPE Synthesis / Sebastian Fries." Düren : Shaker, 2020. http://d-nb.info/1208599321/34.

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13

Blok, Achim Arno. "Analytische Modellierung des Spannungszustandes mehrteiliger Querpressverbände im Zylinder von LDPE-Höchstdruckverdichtern /." Aachen : Shaker, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014900331&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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14

Santos, Rita de Cássia dos. "Caracterização vibracional e térmica de blendas de LDPE e m-LLDPE." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-06032007-220909/.

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As blendas de polietileno de baixa densidade (LDPE) com o polietileno linear de baixa densidade (LLDPE) são utilizadas comercialmente com o objetivo de melhorar as propriedades finais dos produtos e o seu processamento, minimizar custos de produção tendo, como seu principal segmento, filmes para embalagens. O LLDPE utilizado neste trabalho foi sintetizado a partir do catalisador de metaloceno (m-LLDPE) que foi projetado para oferecer melhores propriedades mecânicas em relação ao LLDPE sintetizado por catalisador Ziegler-Natta. O m-LLDPE quando comparado ao LLDPE (Ziegler-Natta) apresenta resi

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15

Mizutani, Teruyoshi, Kenta Shimnmura, Kazue Kaneko, Tatsuo Mori, Mitsugu Ishioka, and Tatsuya Nagata. "Space Charge Behaviors near the Interface between Different Low-Density Polyethylenes." IEEE, 2000. http://hdl.handle.net/2237/7176.

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16

Kaneko, K., H. Semi, T. Mizutani, T. Mori, and M. Ishioka. "Charge Transport and Space Charge Formation in Low-Density Polyethylene." IEEE, 2000. http://hdl.handle.net/2237/7177.

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17

INACIO, WILLIAM BUSCHLE ROMARIZ. "EFFECT OF REPROCESSING ON THE MECHANICAL PROPERTIES OF A HDPE/LDPE BLEND." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34970@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>Os termoplásticos representam a grande maioria dos polímeros empregados hoje em dia e a grande vantagem de sua aplicação é que podem ser reaquecidos e moldados repetidamente. Com a crise do petróleo em 1973, os custos para transformar o petróleo em materiais plásticos se tornaram mais atrativos do que transformá-lo em materiais mais tradicionais. Com isso, os investimentos nas indústrias de transformação cresceram, ao mesmo tempo que a preocupação com o meio ambiente. Devido a facilidade de reprocessar esses materiais a temperaturas moderad

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18

Ferri, Dino <1968&gt. "Correlazioni tra proprietá reologiche, struttura e processabilitá di blend di LLDPE/LDPE." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2396/1/Ferri_Dino_tesi.pdf.

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Polymer blends constitute a valuable way to produce relatively low cost new materials. A still open question concerns the miscibility of polyethylene blends. Deviations from the log-additivity rule of the newtonian viscosity are often taken as a signature of immiscibility of the two components. The aim of this thesis is to characterize the rheological behavior in shear and elongation of five series of LLDPE/LDPE blends whose parent polymers have been chosen with different viscosity and SCB content and length. Synergistic effects have been measured for both zero shear viscosity and melt strengt

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Ferri, Dino <1968&gt. "Correlazioni tra proprietá reologiche, struttura e processabilitá di blend di LLDPE/LDPE." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2396/.

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Polymer blends constitute a valuable way to produce relatively low cost new materials. A still open question concerns the miscibility of polyethylene blends. Deviations from the log-additivity rule of the newtonian viscosity are often taken as a signature of immiscibility of the two components. The aim of this thesis is to characterize the rheological behavior in shear and elongation of five series of LLDPE/LDPE blends whose parent polymers have been chosen with different viscosity and SCB content and length. Synergistic effects have been measured for both zero shear viscosity and melt strengt

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20

Pflug, Kristina Maria [Verfasser]. "Linking Reaction Conditions with Polymer Properties for the LDPE Process / Kristina Maria Pflug." Aachen : Shaker, 2018. http://d-nb.info/1188550616/34.

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21

Blok, Achim A. [Verfasser]. "Analytische Modellierung des Spannungszustandes mehrteiliger Querpressverbände im Zylinder von LDPE-Höchstdruckverdichtern / Achim A Blok." Aachen : Shaker, 2006. http://d-nb.info/1170529291/34.

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22

Eckes, David [Verfasser]. "Modelling of the Industrial LDPE-Synthesis for the Tail-End Reactor Technology / David Eckes." Aachen : Shaker, 2018. http://d-nb.info/1162794291/34.

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23

Ruiz, Ilza Aparecida dos Santos. "Adição de EPDM ou anidrido maléico na blenda LDPE/PA6 e suas propriedades finais." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-11052009-133033/.

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Em virtude do crescente volume da utilização de embalagens multicamadas na preservação de alimentos, torna-se necessário o estudo visando a reciclagem desses materiais através de seu reaproveitamento como matéria-prima e a transformação em novos produtos ou materiais. Dentre os vários tipos de reciclagem utilizados atualmente, a formação de blendas poliméricas com material descartado apresenta-se como uma alternativa viável, pois se trata de uma atividade moderna que une o desenvolvimento tecnológico e a preservação ambiental. O presente trabalho faz um estudo sobre a reciclagem de resíduos de

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24

Sayers, Paul William Charles. "Investigation of the structural changes in LDPE and XLPE induced by high electrical stress." Thesis, Bangor University, 2001. https://research.bangor.ac.uk/portal/en/theses/investigation-of-the-structural-changes-in-ldpe-and-xlpe-induced-by-high-electrical-stress(c94eaa67-4ac2-4021-9f72-6347ca93fe6e).html.

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High voltage electrical cables play an immensely important, although largely unseen, part in the lives of everybody in the world today. They are mostly buried underground and provide trouble free operation for the majority of their operational lives. However, the polymer based insulation that is used for a large number of high voltage cables is subject to long term ageing which can eventually lead to electrical breakdown. This ageing manifests itself as the appearance of tree like structures in the bulk polymer insulator. The growth of a tree frequently starts on the boundary of the polymer at

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25

Bulzaga, Stefano. "Studio dell'invecchiamento termico di LDPE utilizzato per i cavi in bassa tensione nelle centrali nucleari." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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I sistemi di sicurezza e controllo delle centrali nucleari fanno affidamento sull’utilizzo di cavi in bassa tensione (I&C cables) i quali nel corso della loro vita operativa sono sottoposti a sollecitazioni di natura diversa. Le alte temperature e gli elevati livelli di radiazione causano infatti la degradazione dell’isolamento, costituito da materiale polimerico.. Per l’analisi del polimero si è scelta una temperatura di invecchiamento termico pari a 90°C, siccome questa risulta essere la tipica temperatura di lavoro dei cavi in bassa tensione all’interno delle centrali nucleari. L’invecchiam

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26

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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27

Miranda, Gabriela Messias. "Avalia??o do comportamento de degrada??o de Blenda de PEBD com aditivo PEPZYME(TM)." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2017. http://tede2.pucrs.br/tede2/handle/tede/7767.

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Submitted by PPG Engenharia e Tecnologia de Materiais (engenharia.pg.materiais@pucrs.br) on 2017-12-11T15:49:59Z No. of bitstreams: 1 Disserta??o Gabriela Messias Miranda.pdf: 10446144 bytes, checksum: 5a93d29a212d33d004ce8c576f23db33 (MD5)<br>Approved for entry into archive by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-12-18T10:43:52Z (GMT) No. of bitstreams: 1 Disserta??o Gabriela Messias Miranda.pdf: 10446144 bytes, checksum: 5a93d29a212d33d004ce8c576f23db33 (MD5)<br>Made available in DSpace on 2017-12-18T10:50:02Z (GMT). No. of bitstreams: 1 Disserta??o Gabriela Messias Miranda.pd

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Malacart, Lorenzo. "Film di LDPE per uso agricolo additivati con una nuova NOR-HALS: produzione e studio di weathering." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16721/.

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Il progetto è un primo screening delle prestazioni di una nuova NOR-HALS. Sono stati settati due target a due anni in base alla contaminazione da zolfo e alla concentrazione di additivo. I campioni sono stati esposti in condizioni artificiali accelerate e outdoor. Gli agrofarmaci utilizzati sono stati zolfo sublimato, metamsodium e permetrina. I dati riguardano la prima fase espositiva e risultano promettenti.

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Ramanujam, Maalolan [Verfasser], and Jörg [Akademischer Betreuer] Friedrich. "Photo-oxidation and weathering of LDPE studied by surface and bulk analysis / Maalolan Ramanujam. Betreuer: Jörg Friedrich." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2013. http://d-nb.info/103128012X/34.

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30

Dungner, Karin, Ebba Eskner, Amanda Holst, Nina Petersson, Maria Pokosta, and John Eric Roos. "Accelerated aging of cellulose-based composites in different climate environments : A project provided by Biofiber Tech Sweden AB." Thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444877.

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This paper reviews the effects of accelerated aging with increased humidity and temperature on cellulose-based composites. The composites consist of a matrix of plastic reinforced with cellulose fibers. The company Biofiber Tech Sweden AB provided four different composites and a conventional polyolefin as reference. The aim was to examine changes in mechanical properties, chemical composition and appearance after aging, as well as variations between materials. Two different climate conditions were tested, 85% RH and <10% RH, both in 90℃. A climate chamber and an oven were used to create the

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31

shahen, mohamed. "Development of a Nakajima test and its potential variants setup on thin flexible LDPE film and Aluminum foil." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19007.

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The thesis aimed to identify fracture strain for multiaxial loading for laminate material of Al and LDPE that is mostly used in the food packing technology specially in liquid packaging industry. These materials are thin and flexible which make it difficult to handle and test it. The investigation was through applying new Nakajima test setup on such a material by designing a custom setup and 3D printing the Nakajima setup prototype to be able to use it in this study. DIC technique was used to get the results from the Nakajima test and the software used to apply the DIC technique is GOM correla

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32

Camprini, Angela. "Caratterizzazione e modellazione della distribuzione di carica di spazio in LDPE nanoaddittivato con ossido di grafene per applicazioni HVDC." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13362/.

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In questo elaborato viene analizzato l’accumulo di carica di spazio in nanocompositi in LDPE additivato con nanoparticelle di ossido di grafene, al variare della concentrazione di filler impiegata. La carica di spazio è stata valutata mediante il metodo PEA, il cui sistema è stato prima ottimizzato ed automatizzato. Le prove sono state svolte a due livelli di tensione applicata, 40 kV/mm e 60kV/mm, e a tre temperature, 20°C, 40°C e 60°C. Il minor accumulo di carica di spazio, e conseguentemente la minor distorsione del campo elettrico, è stato ottenuto con una concentrazione di filler pari all

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33

Punnam, Pradeep Reddy, and Chitendar Reddy Dundeti. "A Finite Element Analysis of Crack Propagation in Interface of Aluminium Foil - LDPE Laminate During Fixed Arm Peel Test." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14100.

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This thesis deals with numerical simulation of a peel test with an Aluminium foil and Low Density Poly-Ethylene (LDPE) laminate. This work investigates the effects of the substrate thickness and studies the influences of interfacial strength and fracture energy of the cohesive zone between the Aluminium and LDPE. This study evaluates the proper guidelines for defining cohesive properties. A numerical cohesive zone model was created in ABAQUS. Continuum tensile tests were performed to extract LDPE material properties. The aluminium properties were found in literature. After acquiring material p

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Sisli, Zekiye. "Degradable Mulch Films For Agricultural Purposes." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615022/index.pdf.

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The plastic mulch films, which are mostly made from LDPE, are used in order to increase the yields and to prevent the weed growth by covering the top of the soil by leaves or straw in nature. After a period, the mulch films turn into unmanageable quantities of soiled plastic films, which cause an environmental problem. Using degradable mulch films for agricultural purposes can be a solution for the environmental problems caused by the plastic mulch films. In this study, to introduce biodegradability to mulch films, a natural biopolymer starch was used. Before blending, starch was transformed

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Souza, Marcos Rogério de. "Blenda de poli (tereftalato de etileno) com polietileno de baixa densidade." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-03062008-173546/.

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Neste Trabalho foi preparada e estudada a blenda de poli(tereftalato de etileno) (PET) com polietileno de baixa densidade (PEBD). Esta blenda apresenta interesse científico e tecnológico decorrente da possibilidade de associar as propriedades de resistência térmica e elevado módulo de elasticidade do PET à boa resistência à fratura e à flexibilidade a baixas temperaturas do PEBD. Duas séries de misturas contendo diferentes proporções de PET:PEBD foram preparadas através de mistura em fusão numa extrusora dupla-rosca, contendo como agente compatibilizante poli(etileno-butileno)-bloco-poliestire

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Cerqueira, Mario Henrique de. "Processamento do compósito LDPE/Al proveniente da reciclagem de embalagens cartonadas e desenvolvimento de suas modificações com fibras de madeira." Universidade Federal de São Carlos, 2006. https://repositorio.ufscar.br/handle/ufscar/754.

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Made available in DSpace on 2016-06-02T19:11:46Z (GMT). No. of bitstreams: 1 DissMHC.pdf: 9683337 bytes, checksum: e31025256a01fd99b875839339bc3869 (MD5) Previous issue date: 2006-02-10<br>The urban solid waste problem has been one of the biggest environmental challenges these days. The solution to this problem lies in integrated waste management, the objective is to minimize volumes sent to landfills. Recycling is a big part of this waste management process which involves the reprocessing of materials to obtain alternative uses for these materials in every day life. One of the solid waste m

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Borges, Daliana Gomes. "Aproveitamento de embalagens cartonadas em compósito de polietileno de baixa densidade." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-08012008-110235/.

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A produção de materiais plásticos tem se elevado para 169 milhões de toneladas no mundo, no ano de 2003. Uma parte considerável destes polímeros sintéticos, 36% na Europa são destinados ao setor de embalagens. Estas matérias primas são utilizadas por um período de tempo bastante curto e geram um volume de descartes importante. Mesmo com um desenvolvimento considerável de linhas de gestão dos descartes, seu tratamento e sua eliminação colocam ainda problemas provenientes da dificuldade em reutilizar tais embalagens na forma em que são geradas, seja pelo estado de limpeza em que são descartadas,

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Odjo, Andrew O. "Reciclado de polímeros por craqueo catalítico: estudio de la viabilidad de utilización de reactores convencionales de craqueo catalítico en lecho fluidizado (FCC)." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/68368.

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En este trabajo se ha evaluado la viabilidad de la utilización de reactores convencionales de craqueo catalítico en lecho fluidizado (FCC) para el reciclado de los plásticos presentes en los residuos sólidos urbanos. Se ha diseñado y puesto a punto una unidad de FCC a escala de planta piloto, con un reactor tipo “riser” operando en condiciones similares a las que se encuentran en las instalaciones comerciales de FCC. La unidad construida permite el craqueo, separación y recogida de los productos sólidos, líquidos y gaseosos generados en los ensayos llevados a cabo. El diseño de la planta invol

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39

Dogan, Erkan. "Ter Blend Of Poly (ethylene Terephthalate), Polypropylene And Low Density Polyethylene." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1045574/index.pdf.

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This study covers the recycling of waste poly(ethylene terephthalate) (PET) bottles through melt blending with low density polyethylene (LDPE) and polypropylene (PP). In general, polymer blends are known to be immiscible and incompatible with poor mechanical properties. This problem is due to the low intermolecular forces between the components of the immiscible blends. In order to enhance the interaction and compatibility between these matrices, some reactive or non-reactive copolymers were used. In this work<br>PET was treated with silane coupling agent (SCA) (low molecular weight reactive a

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Parimi, Venkata Naga Sai Krishna Janardhan, and Vamsi Eluri. "Stress Analysis of Different Shaped Holes on a Packaging Material." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13613.

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In packaging industries, the demand for usage of Low Density Poly Ethylene foil is of profound interest. In the past, research was carried out on finite and infinite plates with varying crack lengths but having constant crack width. In this thesis, a detailed analysis on crack initiation is carried out on finite plates by varying width of the hole. The hole shapes for stress analysis include circle, ellipse and rectangular notch. Initially, maximum stress is found out using Linear Elastic Fracture Mechanics (LEFM) theory and compared with Finite element method (FEM) results. Secondly using Ela

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Santos, Mauricio Cesar Ferreira. "Aplicação de pigmento preto de carvão vegetal em polietileno de baixa densidade e influência da radiação ionizante." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-17022014-135334/.

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Neste trabalho foi estudado o desenvolvimento de um pigmento vegetal preto que possui características semelhantes aos já existentes no mercado de transformação de termoplásticos. Atualmente o pigmento preto mais utilizado nas indústrias de transformação de termoplásticos é o negro de fumo, cujo processo de obtenção gera muitos resíduos tóxicos e quando liberados na atmosfera aumenta a poluição do ar. O pigmento em estudo possui a estrutura química formada por 97% de carbono proveniente da moagem e micronização do carvão vegetal. Os objetivos do presente trabalho foram estudar a obtenção do pig

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Franco, Vittorio. "Sviluppo di un materiale composito a matrice polimerica termoplastica contenente nanofibre piezoelettriche." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Obiettivo della seguente tesi è stato quelli di realizzare e studiare un innovativo materiale composito termoplastico a matrice polimerica con nanofibre piezoelettriche. Il materiale inizialmente ipotizzato ed infine realizzato consta di una matrice di polietilene a bassa densità (LDPE, low density polyethilene) e di uno strato di nanofibre di PVDF-TrFE con caratteristiche piezoelettriche prodotto mediante il processo elettrofilatura. Tra la moltitudine di configurazioni analizzate, quella che ha portato ai risultati migliori consiste in uno spessore del provino di circa 200 μm, realizzato in

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Goes, Marcel Andrey de. "PRODUÇÃO E CARACTERIZAÇÃO DE COMPÓSITOS DE PEBD/Al ORIUNDOS DE EMBALAGENS LONGA VIDA COM PÓ-DE-BORRACHA DE PNEUS OU NEGRO DE FUMO." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1456.

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Made available in DSpace on 2017-07-21T20:42:46Z (GMT). No. of bitstreams: 1 Marcel Andrey Goes.pdf: 5184782 bytes, checksum: a787384782a6f45c061c35c283413ec8 (MD5) Previous issue date: 2014-08-27<br>Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná<br>The most common process for recycling post-consumer carton packages of Long Life type is using a "hydrapulper", this device allows to separate the paper from the waste LDPE / Al. In these material a feature which is not valued is due to the presence of Al which will be explored to provide a more attractive visua

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Silva, Juliana Lopes. "Modelagem e simulação de reatores autoclave para produção de PEBD." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/60997.

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O polietileno de baixa densidade (PEBD) é uma resina termoplástica fabricada através de processos a altas pressões, com reatores do tipo autoclave ou tubular. O cenário atual é de crescente demanda por PEBD produzido a custos competitivos, através de plantas de alto desempenho e capacidade, de modo que o desenvolvimento de processo e produto torna-se um fator chave para as empresas produtoras, sendo os simuladores de processo ferramentas de grande importância para esta finalidade. O objetivo desta dissertação é a implementação de um modelo matemático que represente reatores autoclave de produç

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Sandblom, Karin. "Bionedbrytning och mikroplastbildning i akvatiska miljöer : Utvärdering avanalystekniker." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-23433.

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Plastproduktionen har ökat kraftigt i världen sedan 1950-talet, därmed även förekomsten av plastavfall som ansamlas i naturen. Det pågår flera initiativ på internationell nivå för att förebygga och hantera förekomsten av mikroplast i haven och en viktig aspekt för att minska miljöpåverkan från plastavfall är att öka användandet av bionedbrytbara material. Ett flertal analystekniker är tillgängliga i syfte att analysera nedbrytbarheten hos plaster men då metoderna är många och ibland överlappar har flera studier uppmärksammat behovet av harmonisering och standardisering. Syftet med denna studie

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Legault, Marc-André. "Levier synthétique de silice : une approche pour fonctionnaliser les surfaces hydroxylées." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8998.

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La présente recherche couvre les premiers essais d’une nouvelle méthode de fonctionnalisation chimique de surfaces hydroxylées. La méthode consiste à faire réagir ladite surface avec un réactif en excès, le tétrachlorure de silicium (SiCl4), rendant celle-ci chimiquement réactive à n’importe quel alcool externe ajouté par la suite au milieu. L’alcool externe modifie les propriétés de surface du substrat dépendamment de sa composition. Une multitude de fonctionnalités chimiques peuvent être présentes sur l’alcool externe et ce sont elles qui dictent les nouvelles propriétés de surface. Dans l’é

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Traore, Brahiman. "Elaboration et caractérisation d’une structure composite (sable et déchets plastiques recyclés) : Amélioration de la résistance par des charges en argiles." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA029/document.

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Ce projet a pour but de concevoir un pave à base de déchets plastiques récupérés dans les décharges et de mélange de sable et de gravier. Ce pavé devant servir à la réalisation de trottoirs et de routes communales, doit donc être capable de répondre aux conditions techniques de son utilisation. Cependant, la méthode de fabrication et le matériel utilisé doit être assez simple pour permettre sa prise en main rapide par des ouvriers peu qualifiés et un cout de production faible afin d’être économiquement compétitif. Les pavés seront donc testés pour identifier leur performance à la fois mécaniqu

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Gandolfi, Frédéric. "Évaluation des techniques de micro-extraction/préconcentration et d’échantillonnage passif comme outils de mesure de la contamination du milieu aquatique par des composés organo-halogénés hydrophobes émergents." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4387.

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La DCE a pour principale ambition d’harmoniser les politiques de l’eau sur un plan européen et d’atteindre le bon état des eaux d’ici 2015. L’évaluation de ce “bon état” implique en outre de dresser l’inventaire, dans les masses d’eau, des 33 substances prioritaires listées en annexe X de la DCE (annexe X, décision No 2455/2001/EC) et pour lesquelles des normes de qualité environnementales (NQE) ont été fixées (Directive 2013/39/EU). Parmi ces substances figurent les polychloroalcanes (SCCPs) et les polybromodiphényléthers (PBDEs) appartenant à la catégorie des micropolluants halogénés “émerge

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Altintas, Bekir. "Electrical And Mechanical Properties Of Carbon Black Reinforced High Density Polyethylene/low Density Polyethylene Composites." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12604976/index.pdf.

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In this study, the High Density Polyethylene (HDPE) and Low Density Polyethylene (LDPE) blends prepared by Plasticorder Brabender were strengthened by adding Carbon Black (CB). Blends were prepared at 190 &deg<br>C. Amounts of LDPE were changed to 30, 40, 50 and 60 percent by the volume and the percent amounts of CB were changed to 5, 10,15, 20 and 30 according to the total volume. Thermal and morphological properties were investigated by using Differential Scanning Calorimeter (DSC), Scanning Electron Microscope (SEM). Mechanical properties were investigated by tensile test and hardness mea

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Majumder, Khokan Kanti, and khokankanti@yahoo com. "Blown Film Extrusion: Experimental, Modelling and Numerical Study." RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080509.161859.

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Abstract This thesis correlates rheological data into a non-linear blown film model that describes the stress and cooling-induced morphological transformations in the axial and flow profiles of the blown films. This will help to improve the physical and mechanical properties of the films in a cost effective way, which will in turn be of great benefit to the food and packaging industries. In this research, experimental and numerical studies of a blown film extrusion were carried out using two different low-density polyethylenes (LDPEs). In the experiment, the key parameters measure

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