• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

PROCESSAMENTO E CARACTERIZAÇÃO DE MISTURAS DE PEBD VIRGEM E RECICLADO COM BORRACHA DE PNEU DESVULCANIZADA POR MICROONDAS “IN SITU”.

Vieira Filho, Armando Madalosso 11 September 2009 (has links)
Made available in DSpace on 2017-07-21T20:42:34Z (GMT). No. of bitstreams: 1 Armando Madalosso Vieira Filho.pdf: 12599724 bytes, checksum: 65d627ecd808a90acce0c965752d8655 (MD5) Previous issue date: 2009-09-11 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Finding new ways and techniques of recycling has been one of the main paths searched by investigators to solve the problem of the garbage. For this study were chosen two of the polymers with large volumes of post-consumer material: LDPE and rubber tire. Several studies have been made to incorporate rubber tire in polymers by following different paths one of them is the devulcanization of rubber tire by microwave. The focus of this study was process and characterize blends of virgin and / or recycled LDPE with ground tire rubber. Both formulations, virgin and recycled LDPE, were made with percentage by weight of 0, 5, 10, 20 and 40 of rubber in and with percentage by weight of 0 and 10 in the blends of 50% virgin / 50% recycled LDPE. The formulations were processed into a of single screw extruder, granulated, injected and treated with microwave “in situ”. Tests were made for size distribution of the rubber, tensile, bending, optical and scanning electron microscopy, DSC and infrared spectroscopy. As results obtained were: a rubber tire can be used as an additive for staining, mechanical properties similar to almost all formulations was obtained with up to 10% of tire rubber. The amount of rubber incorporated and composition (recycled or virgin) influence the mechanical and thermal properties of some blends. The treatment with microwaves "in situ" presented influence on the mechanical and thermal properties in the formulations tested, presenting differential properties, such as increased maximum stress in some formulations, demonstrating that the study of the treatment is technologically interesting. / Encontrar novos meios e técnicas de reciclagem têm sido um dos grandes caminhos buscados por pesquisadores para resolver o problema do lixo. Para este estudo foram escolhidos dois dos polímeros com grandes volumes de material pós-consumo: PEBD e borracha de pneu. Várias pesquisas têm sido feitas no sentido de incorporar borracha de pneu em polímeros seguindo diversos caminhos e dentre eles está a desvulcanização da borracha por microondas. O objetivo deste trabalho foi processar e caracterizar misturas de PEBD virgem e/ou recicladas incorporadas com pó de borracha de pneu. Foram feitas formulações com teores de 0, 5, 10, 20 e 40% em peso de borracha no PEBD virgem e reciclado, e 0 e 10% em blendas de PEBD/ PEBD reciclado (50/50). As formulações foram processadas em extrusora de rosca simples, injetadas e tratadas com microondas “in situ”. Foram feitos ensaios de distribuição granulométrica da borracha, tração, flexão, microscopia, DSC e FTIR. Observou-se: que a borracha de pneu pode servir como aditivo para fins de coloração; propriedades mecânicas similares com até 10% de borracha para quase todas as formulações; que a quantidade de borracha incorporada e o tipo de matriz influenciam as propriedades mecânicas e térmicas. O tratamento “in situ” com microondas apresentou influência nas propriedades mecânicas e térmicas nas formulações ensaiadas apresentando propriedades diferenciadas, como aumento da tensão máxima em algumas formulações, demonstrando que o estudo do tratamento é interessante tecnologicamente.

Page generated in 0.0763 seconds