Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UERJ |
Texto Completo: | http://www.bdtd.uerj.br/handle/1/15739 |
Resumo: | Manganese ferrite (MnFe2O4) nanoparticles have been of great interest for their remarkable soft-magnetic properties (low coercivity, moderate saturation magnetization) and also for their good chemical stability and mechanical hardness. The formation of ferrite/polymer hybrid/composite materials not only stabilized the magnetic nanoparticles (NMPs), but also gives the materials new properties. However, it was not found in the literature neither the synthesis nor the properties of manganese ferrites in polar crosslinked polymers based on methacrylic acid. The aim of this Dissertation is to produce spherical particles of crosslinked polymers with good magnetic properties based on methacrylic acid, styrene, divinylbenzene and manganese ferrites. In this work, it was synthesized compounds of manganese ferrites (MnFe2O4) scattered at copolymers of poly(methacrylic-acid-co-styrene-co-divinylbenzene) by suspension polymerization and semi-suspension polymerization. The following parameters were evaluated: contents of ferrites (1% and 5%) and concentration of suspension agent (0,2% and 5%). Moreover, it was evaluated synthesis containing organic phases (FO) pre-polymerized and mixture of the ferrite to the organic phase, previous to the stage of suspension polymerization. The copolymers were analyzed as the morphology optical microscopy; magnetic properties and distribution of ferrites at polymeric matrix VSM, SEM e EDS-X; thermal properties TGA; concentration of ferrites at polymeric matrix atomic absorption. Ferrites were evaluated as the crystallography XRD. The pre-polymerized samples and those which the ferrites were mixed at the organic phase, showed better magnetic properties and higher ferrite incorporation at polymeric matrix. No agglomeration was found in the copolymers synthesized by these routes and also the ferrite presence was minimized on the microsphere surface. All copolymers presented soft-magnetic properties as well as superparamagnetism. It was observed that raising the suspension agent concentration and reducing ferrite concentration resulted in the decrease of the microspheres diameters. TGA and DTG results showed that mixing ferrites at the organic phase rises the concentration of magnetic materials about 10%. However, only PM2550 sample, pre-polymerized and with ferrites mixed with the organic phase (5% ferrite and 0,2% PVA), presented potential application as know ferrites presence was not detected on microspheres surface, hence, magnetic materials will be protected by any external action |
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Costa, Marcos Antonio da Silvahttp://lattes.cnpq.br/0990689525640393Michel, Ricardo Cunhahttp://lattes.cnpq.br/7631294110820860Teixeira, Viviane Gomeshttp://lattes.cnpq.br/1229963402809254http://lattes.cnpq.br/4947275342960521Ferreira, Diego Lopes2021-01-07T19:02:07Z2012-04-242012-02-29FERREIRA, Diego Lopes. Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês. 2012. 87 f. Dissertação (Mestrado em Química ambiental; Polímeros) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2012.http://www.bdtd.uerj.br/handle/1/15739Manganese ferrite (MnFe2O4) nanoparticles have been of great interest for their remarkable soft-magnetic properties (low coercivity, moderate saturation magnetization) and also for their good chemical stability and mechanical hardness. The formation of ferrite/polymer hybrid/composite materials not only stabilized the magnetic nanoparticles (NMPs), but also gives the materials new properties. However, it was not found in the literature neither the synthesis nor the properties of manganese ferrites in polar crosslinked polymers based on methacrylic acid. The aim of this Dissertation is to produce spherical particles of crosslinked polymers with good magnetic properties based on methacrylic acid, styrene, divinylbenzene and manganese ferrites. In this work, it was synthesized compounds of manganese ferrites (MnFe2O4) scattered at copolymers of poly(methacrylic-acid-co-styrene-co-divinylbenzene) by suspension polymerization and semi-suspension polymerization. The following parameters were evaluated: contents of ferrites (1% and 5%) and concentration of suspension agent (0,2% and 5%). Moreover, it was evaluated synthesis containing organic phases (FO) pre-polymerized and mixture of the ferrite to the organic phase, previous to the stage of suspension polymerization. The copolymers were analyzed as the morphology optical microscopy; magnetic properties and distribution of ferrites at polymeric matrix VSM, SEM e EDS-X; thermal properties TGA; concentration of ferrites at polymeric matrix atomic absorption. Ferrites were evaluated as the crystallography XRD. The pre-polymerized samples and those which the ferrites were mixed at the organic phase, showed better magnetic properties and higher ferrite incorporation at polymeric matrix. No agglomeration was found in the copolymers synthesized by these routes and also the ferrite presence was minimized on the microsphere surface. All copolymers presented soft-magnetic properties as well as superparamagnetism. It was observed that raising the suspension agent concentration and reducing ferrite concentration resulted in the decrease of the microspheres diameters. TGA and DTG results showed that mixing ferrites at the organic phase rises the concentration of magnetic materials about 10%. However, only PM2550 sample, pre-polymerized and with ferrites mixed with the organic phase (5% ferrite and 0,2% PVA), presented potential application as know ferrites presence was not detected on microspheres surface, hence, magnetic materials will be protected by any external actionAs nanopartículas de ferritas de manganês (MnFe2O4) tem sido de grande interesse por causa de suas notáveis propriedades magnéticas doces (baixa coercividade e moderada magnetização de saturação) acompanhada com boa estabilidade química e dureza mecânica. A formação de materiais híbridos/compósito estabiliza as nanopartículas magnéticas (NPMs) e gera funcionalidades aos materiais. Entretanto, não foi encontrada na literatura uma discussão sobre a síntese e as propriedades de polímeros polares reticulados à base de ácido metacrílico contendo ferritas de manganês na matriz polimérica. Assim, o objetivo desta Dissertação foi produzir partículas esféricas poliméricas reticuladas, com boas propriedades magnéticas, à base de ácido metacrílico, estireno, divinilbenzeno e ferritas de manganês. Neste trabalho, foram sintetizados compósitos de ferrita de manganês (MnFe2O4) dispersa em copolímeros de poli(ácido-metacrílico-co-estireno-co-divinilbenzeno), via polimerização em suspensão e em semi-suspensão. Foram variados os teores de ferrita (1% e 5%) e a concentração do agente de suspensão (0,2% e 5%). Além disso, foram testadas sínteses contendo a fase orgânica pré-polimerizada, e também a mistura da ferrita na fase orgânica (FO), antes da etapa da polimerização em suspensão. Os copolímeros foram analisados quanto as suas morfologias - microscopia óptica; propriedades magnéticas e distribuição das ferritas na matriz polimérica - VSM, SEM e EDS-X; propriedades térmicas TGA; concentração de metais presentes na matriz polimérica absorção atômica. As ferritas foram avaliadas quanto à cristalografia XRD. A matriz polimérica foi avaliada pela técnica de FTIR. As amostras que foram pré-polimerizadas e as que além de pré-polimerizadas foram misturadas as ferritas de manganês na FO, apresentaram as melhores propriedades magnéticas e uma incorporação maior da ferrita na matriz polimérica. Essas rotas sintéticas fizeram com que os copolímeros não apresentassem aglomeração, e também minimizou a presença de ferritas na superfície das microesferas. Em geral, todos os copolímeros obtidos apresentaram as características de materiais magneticamente doces além do superparamagnetismo. Foi constatado que o aumento da concentração do PVA e a diminuição da concentração da ferrita fazem com que os diâmetros das microesferas decresçam. Os resultados de TGA e DTG mostraram que ao misturar as ferritas na FO, a concentração de material magnético na matriz polimérica aumenta cerca de 10%. Entretanto, somente a amostra PM2550, pré-polimerizada e com as ferritas misturadas na FO (5% de ferrita e 0,2% de PVA), apresentou potencial aplicação. Isso porque as ferritas não ficaram expostas na superfície das microesferas, ou seja, o material magnético fica protegido de qualquer ação externaSubmitted by Boris Flegr (boris@uerj.br) on 2021-01-07T19:02:07Z No. of bitstreams: 1 dissertacao diego lopes ferreira.pdf: 2297438 bytes, checksum: 6c63693a58392d2789b96f2c5c159838 (MD5)Made available in DSpace on 2021-01-07T19:02:07Z (GMT). No. of bitstreams: 1 dissertacao diego lopes ferreira.pdf: 2297438 bytes, checksum: 6c63693a58392d2789b96f2c5c159838 (MD5) Previous issue date: 2012-02-29Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade do Estado do Rio de JaneiroPrograma de Pós-Graduação em QuímicaUERJBRCentro de Tecnologia e Ciências::Instituto de QuímicaMethacrylic Acidmanganese ferritesmagnetismmicrospheressuspension polymerizationÁcido metacrílicoferritas de manganêsmagnetismomicroesferaspolimerização em suspensãoCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA::POLIMEROS E COLOIDESSíntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganêsSynthesis and characterization of polymeric microspheres based on crosslinked poly(methacrylic acid) containing nanoparticles of manganese ferritesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UERJinstname:Universidade do Estado do Rio de Janeiro (UERJ)instacron:UERJORIGINALdissertacao diego lopes ferreira.pdfapplication/pdf2297438http://www.bdtd.uerj.br/bitstream/1/15739/1/dissertacao+diego+lopes+ferreira.pdf6c63693a58392d2789b96f2c5c159838MD511/157392024-02-27 14:47:45.736oai:www.bdtd.uerj.br:1/15739Biblioteca Digital de Teses e Dissertaçõeshttp://www.bdtd.uerj.br/PUBhttps://www.bdtd.uerj.br:8443/oai/requestbdtd.suporte@uerj.bropendoar:29032024-02-27T17:47:45Biblioteca Digital de Teses e Dissertações da UERJ - Universidade do Estado do Rio de Janeiro (UERJ)false |
dc.title.por.fl_str_mv |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
dc.title.alternative.eng.fl_str_mv |
Synthesis and characterization of polymeric microspheres based on crosslinked poly(methacrylic acid) containing nanoparticles of manganese ferrites |
title |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
spellingShingle |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês Ferreira, Diego Lopes Methacrylic Acid manganese ferrites magnetism microspheres suspension polymerization Ácido metacrílico ferritas de manganês magnetismo microesferas polimerização em suspensão CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA::POLIMEROS E COLOIDES |
title_short |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
title_full |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
title_fullStr |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
title_full_unstemmed |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
title_sort |
Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês |
author |
Ferreira, Diego Lopes |
author_facet |
Ferreira, Diego Lopes |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Costa, Marcos Antonio da Silva |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0990689525640393 |
dc.contributor.referee1.fl_str_mv |
Michel, Ricardo Cunha |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/7631294110820860 |
dc.contributor.referee2.fl_str_mv |
Teixeira, Viviane Gomes |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/1229963402809254 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4947275342960521 |
dc.contributor.author.fl_str_mv |
Ferreira, Diego Lopes |
contributor_str_mv |
Costa, Marcos Antonio da Silva Michel, Ricardo Cunha Teixeira, Viviane Gomes |
dc.subject.eng.fl_str_mv |
Methacrylic Acid manganese ferrites magnetism microspheres suspension polymerization |
topic |
Methacrylic Acid manganese ferrites magnetism microspheres suspension polymerization Ácido metacrílico ferritas de manganês magnetismo microesferas polimerização em suspensão CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA::POLIMEROS E COLOIDES |
dc.subject.por.fl_str_mv |
Ácido metacrílico ferritas de manganês magnetismo microesferas polimerização em suspensão |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA::POLIMEROS E COLOIDES |
description |
Manganese ferrite (MnFe2O4) nanoparticles have been of great interest for their remarkable soft-magnetic properties (low coercivity, moderate saturation magnetization) and also for their good chemical stability and mechanical hardness. The formation of ferrite/polymer hybrid/composite materials not only stabilized the magnetic nanoparticles (NMPs), but also gives the materials new properties. However, it was not found in the literature neither the synthesis nor the properties of manganese ferrites in polar crosslinked polymers based on methacrylic acid. The aim of this Dissertation is to produce spherical particles of crosslinked polymers with good magnetic properties based on methacrylic acid, styrene, divinylbenzene and manganese ferrites. In this work, it was synthesized compounds of manganese ferrites (MnFe2O4) scattered at copolymers of poly(methacrylic-acid-co-styrene-co-divinylbenzene) by suspension polymerization and semi-suspension polymerization. The following parameters were evaluated: contents of ferrites (1% and 5%) and concentration of suspension agent (0,2% and 5%). Moreover, it was evaluated synthesis containing organic phases (FO) pre-polymerized and mixture of the ferrite to the organic phase, previous to the stage of suspension polymerization. The copolymers were analyzed as the morphology optical microscopy; magnetic properties and distribution of ferrites at polymeric matrix VSM, SEM e EDS-X; thermal properties TGA; concentration of ferrites at polymeric matrix atomic absorption. Ferrites were evaluated as the crystallography XRD. The pre-polymerized samples and those which the ferrites were mixed at the organic phase, showed better magnetic properties and higher ferrite incorporation at polymeric matrix. No agglomeration was found in the copolymers synthesized by these routes and also the ferrite presence was minimized on the microsphere surface. All copolymers presented soft-magnetic properties as well as superparamagnetism. It was observed that raising the suspension agent concentration and reducing ferrite concentration resulted in the decrease of the microspheres diameters. TGA and DTG results showed that mixing ferrites at the organic phase rises the concentration of magnetic materials about 10%. However, only PM2550 sample, pre-polymerized and with ferrites mixed with the organic phase (5% ferrite and 0,2% PVA), presented potential application as know ferrites presence was not detected on microspheres surface, hence, magnetic materials will be protected by any external action |
publishDate |
2012 |
dc.date.available.fl_str_mv |
2012-04-24 |
dc.date.issued.fl_str_mv |
2012-02-29 |
dc.date.accessioned.fl_str_mv |
2021-01-07T19:02:07Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
FERREIRA, Diego Lopes. Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês. 2012. 87 f. Dissertação (Mestrado em Química ambiental; Polímeros) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2012. |
dc.identifier.uri.fl_str_mv |
http://www.bdtd.uerj.br/handle/1/15739 |
identifier_str_mv |
FERREIRA, Diego Lopes. Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês. 2012. 87 f. Dissertação (Mestrado em Química ambiental; Polímeros) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2012. |
url |
http://www.bdtd.uerj.br/handle/1/15739 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade do Estado do Rio de Janeiro |
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Programa de Pós-Graduação em Química |
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UERJ |
dc.publisher.country.fl_str_mv |
BR |
dc.publisher.department.fl_str_mv |
Centro de Tecnologia e Ciências::Instituto de Química |
publisher.none.fl_str_mv |
Universidade do Estado do Rio de Janeiro |
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Biblioteca Digital de Teses e Dissertações da UERJ |
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Biblioteca Digital de Teses e Dissertações da UERJ - Universidade do Estado do Rio de Janeiro (UERJ) |
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