• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
10.11606/T.3.2016.tde-13072016-145704
Document
Author
Full name
Leila Veronica da Rocha Gomes
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Diaz, Francisco Rolando Valenzuela (President)
Cortés, Guillermo Ruperto Martín
Esper, Fábio José
Moura, Esperidiana Augusta Barretos de
Wiebeck, Hélio
Title in Portuguese
Preparação e caracterização de nanocompósitos de polipropileno reforçados com argila verde lodo e fibra da castanha-do-brasil.
Keywords in Portuguese
Argilas
Fibras naturais
Nanocompósitos
Abstract in Portuguese
A incorporação de nanocargas minerais e vegetais em matriz polimérica tem sido estudada, principalmente, com o objetivo de melhorar as propriedades de desempenho mecânico dos polímeros para aplicações industriais diversas. As argilas organofilizadas e as fibras vegetais estão entre os materiais que se destacam como cargas adicionadas ao polímero para a formação de nanocompósitos. Essa área de estudo tem despertado interesse também devido à obtenção de melhorias de propriedades físicas, químicas e mecânicas desses materiais quando comparadas às dos materiais compósitos tradicionais. O objetivo da pesquisa foi estudar algumas dessas propriedades em nanocompósitos produzidos com polipropileno, argila esmectítica brasileira e fibra do ouriço da castanha-do-brasil, com ênfase na melhora das propriedades mecânicas. Inicialmente, os materiais componentes foram caracterizados por diversos ensaios, tais como, difração de raios X, granulometria, infravermelho, microscopia eletrônica de varredura, temperatura de degradação térmica, além de ensaios específicos para medir características individuais da argila, como, viscosidade Fann, inchamento de Foster, limite de plasticidade, fluorescência de raios X, entre outros. Posteriormente, o polipropileno graftizado com anidrido maleico (PP-g-MA) foi incorporado ao PP puro (PP), em extrusora dupla rosca, nas proporções de 5%, 10% e 20% em peso e injetados os corpos de prova para os ensaios de tração e impacto. A partir dos resultados das propriedades mecânicas definiu-se o uso de 5% de PP-g-MA para preparação dos nanocompósitos definitivos. Finalmente, variou-se a quantidade de fibra na composição. Foram obtidos nanocompósitos de polipropileno (PP) e 5% PPg- MA reforçado com 5% em peso da argila organofilizada e fibra do ouriço da castanha-do-brasil em três proporções 5%, 10% e 15% em peso. As amostras foram caracterizadas por diferentes técnicas (DRX, MEV, FTIR, TG/DSC) e medidas as resistências mecânicas à tração, flexão e impacto. Todos os nanocompósitos apresentaram aumento na resistência mecânica quando comparados ao polímero sem argila e fibra.
Title in English
Preparation and characterization of polypropylene nanocomposites reinforced with organophilic clay and brazilian nut fibers.
Keywords in English
Clays
Natural fibers
Organoclays
Polymeric nanocomposites
Abstract in English
The incorporation of vegetable and mineral nanofillers in polymer matrix has been studied mainly in order to improve the mechanical performance properties of polymers for various industrial applications. The organoclays and vegetable fibers are among the materials that stand out as fillers added to polymer for the formation of nanocomposites. This study has also attracted interest owing to achieve improvements in various properties when compared to other traditional composite materials. This study aims to investigate the effects of adding organophilic clay and brazilian nut fibers on the some physical, chemical and mechanical properties of polypropylene nanocomposite. Initially, The component materials were characterized by tests, such as X-ray diffraction, particle size, infrared, scanning electron microscopy, thermal degradation, as well as specific assays for measuring individual characteristics and properties of the clay, for example, viscosity Fann, Foster swelling, plasticity limit, X-ray fluorescence, among others. In the second step, the graftizado polypropylene with maleic anhydride (PP-g-MA) was incorporated into the pure PP, extruded in proportions of 5 weight%, 10 weight% and 20 weight% and injected the samples for tensile and impact tests. From the results of mechanical properties was defined using 5 weight% of PP-g-Ma for the incorporation into pure PP. Finally, samples were prepared containing only polymer, graftizado polymer/clay, graftizado polymer/clay/ fiber. The addition of clay was 5 weight% and the fiber was added to 5 weight%, 10 weight% and 15% by weight, respectively. The nanocomposites were prepared double-screw extruder and the samples injection molded, then, they were characterized by X-ray diffraction, scanning electron microscope (SEM), thermal analysis (TG/DSC), infrared spectroscopy and mechanical strength, flexural and impact test. All the nanocomposites increased mechanical properties as compared to polymer without clay and fibers.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2016-07-27
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • CARVALHO, F. M. S., et al. Quantificação de argilominerais em argila brasileira para controle da sua qualidade. In 56 Congresso Brasileiro de Cerâmica e 1 Congresso Latino-Americano de Cerâmica, Curitiba, 2012. CD 56 Congresso Brasileiro de Cerâmica e 1 Congresso Latino-Americano de Cerâmica.São Paulo : Associação Brasileira de Cerâmica, 2012. Resumo.
  • Matos, Camila Martini, et al. Organophilization of a Brazilian Kaolin Clay [doi:10.1002/9781118659045.ch62]. In . Characterization of Minerals, Metals and Materials 2013 [online]. Organizador. New Jersey : Wiley, TMS, 2013{Volume}, p. 541-545.http://www.teses.usp.br/teses/disponiveis/3/3133/tde-13072016-145704/
  • ORTIZ, A. V., et al. COMPARISON BETWEEN HDPE/CLAY AND HDPE/PIASSAVA FIBER/CLAY TREATED BY ELECTRON BEAM RADIATION. In Edited by: Jiann-Yang Hwang, Chengguang Bai, John Carpenter, Shadia J Ikhmayies,Bowen Li, Sergio Neves Monteiro, Zhiwei Peng, Mingming Zhang. Characterization of Minerals, Metals, and Materials 2013. Organizador.01. New Jersey : John Wiley and Sons, 2013{Volume}, p. 427-432.http://www.teses.usp.br/teses/disponiveis/3/3133/tde-13072016-145704/
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2020. All rights reserved.