Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III)
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFS |
Texto Completo: | https://ri.ufs.br/handle/riufs/6058 |
Resumo: | In this work siloxane-polymethyl methacrylate (PMMA) hybrid materials were synthesized and doped with Eu (III) from solid europium chloride, solid europium (III) nitrate, europium chloride (III) in alcoholic solution and 3-aminopyrazine-2-carboxylate of lanthanum and europium complex. The hybrid was prepared from methyl methacrylate (MMA) and 3-methacryloxy-propyl-trimethoxysilane (MPTS), using benzoyl peroxide (BPO) as polymerization initiator. The use of the sol-gel method by acid catalysis allowed to obtain pure solid materials and doped with europium different sources with amorphous characteristics, as evidenced by the X-ray diffraction powderdata. The insertion of the europium complex in the polycrystalline matrix did not changethe structural characteristics of the samples. It was observed that the materials doped with europium in solution, showed greater adsorbed amounts of solvents and structural features that changethe spectroscopic properties. The samples containing solid salts showed similar structural features. It was observed that the average life time of the radioactive emissions increase with the heat treatment, indicating that the temperature reduces the number of suppressor luminescence groups in the coordinationenvironment oflanthanides ion and the character non monoexponentialof the decay is indicative of the presence different coordination environments. In the 29Si NMR measurementsfor samples containing alcoholic solution of europium chloride are observed monomer (RSi(OSi)(OH)2), diimeric(R-Si(OSi)2(OH)) and fully condensed (RSi(OSi)3)species,having a polycondensationdegree up to 78% . The materialsdoped with europium complex show strong luminescence, except tosamples treated at 200 ° C, which is indicative of thermal degradation of the coordination complex. It was observed that presence of solvent changedthermal stability, different heat treatments and europium sources exerted strong influence on the coordination environment of the Eu (III) ions in the organic -inorganic hybrid materials. |
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Santos, Simei Tarse SobrinhoSarmento, Victor Hugo Vitorinohttp://lattes.cnpq.br/38778139420369392017-09-27T13:57:26Z2017-09-27T13:57:26Z2014-03-28https://ri.ufs.br/handle/riufs/6058In this work siloxane-polymethyl methacrylate (PMMA) hybrid materials were synthesized and doped with Eu (III) from solid europium chloride, solid europium (III) nitrate, europium chloride (III) in alcoholic solution and 3-aminopyrazine-2-carboxylate of lanthanum and europium complex. The hybrid was prepared from methyl methacrylate (MMA) and 3-methacryloxy-propyl-trimethoxysilane (MPTS), using benzoyl peroxide (BPO) as polymerization initiator. The use of the sol-gel method by acid catalysis allowed to obtain pure solid materials and doped with europium different sources with amorphous characteristics, as evidenced by the X-ray diffraction powderdata. The insertion of the europium complex in the polycrystalline matrix did not changethe structural characteristics of the samples. It was observed that the materials doped with europium in solution, showed greater adsorbed amounts of solvents and structural features that changethe spectroscopic properties. The samples containing solid salts showed similar structural features. It was observed that the average life time of the radioactive emissions increase with the heat treatment, indicating that the temperature reduces the number of suppressor luminescence groups in the coordinationenvironment oflanthanides ion and the character non monoexponentialof the decay is indicative of the presence different coordination environments. In the 29Si NMR measurementsfor samples containing alcoholic solution of europium chloride are observed monomer (RSi(OSi)(OH)2), diimeric(R-Si(OSi)2(OH)) and fully condensed (RSi(OSi)3)species,having a polycondensationdegree up to 78% . The materialsdoped with europium complex show strong luminescence, except tosamples treated at 200 ° C, which is indicative of thermal degradation of the coordination complex. It was observed that presence of solvent changedthermal stability, different heat treatments and europium sources exerted strong influence on the coordination environment of the Eu (III) ions in the organic -inorganic hybrid materials.Neste trabalho materiais híbridos Siloxano-Polimetacrilato de metila (PMMA) foram sintetizados e dopados com íons Eu(III) provenientes de cloreto e nitrato de európio (III) sólidos, cloreto de európio (III) em solução alcoólica e complexo 3-aminopirazina-2-Carboxílato de lantânio e európio. O hibrido foi preparado a partir dometacrilato de metila (MMA) e do 3-metacriloxi-propil-trimetoxisilano (MPTS), utilizando-se como agente inicializador de polimerização o peróxido de benzoila (BPO). A utilização dametodologia de síntese sol-gel por catálise ácida possibilitou a obtenção de materiais sólidos puros e dopados com diferentes fontes de európio, com características amorfas, como ficou evidente pelos dados de difração de raios X de pó. A inserção de complexo de európiopolicristalino na matriz não alterou as características estruturais da amostra.Observou-se que os materiais que foram dopados com európio em solução, apresentaram maior quantidade de solventes adsorvidos e características estruturais que alteraram as suas propriedades espectroscópicas. As amostras dopadas com sais sólidos apresentaram características estruturais semelhantes. Observou-se que os tempos de vida médios das emissões radiativas aumentam com o tratamento térmico, o que indica que o tratamentoreduz o número de grupos supressores de luminescência no ambiente de coordenação do íon lantanídeo e o caráter não monoexponencial do decaimento é indicativo da presença de diferentes ambientes de coordenação. Pelo RMN do 29Si para as amostras dopadas com solução alcoólica de cloreto de európio são observadas espécies monoméricas(R-Si(OSi)(OH)2), diméricas(R-Si(OSi)2(OH)) e totalmente condensadas(R-Si(OSi)3) com um grau de policondensação de até 78%. Os materiais dopados com o complexo apresentam forte luminescência, exceto as amostras tratadas a 200°C, o que é indicativo da degradação térmica do complexo de coordenação. Observou-se que a presença de solvente alterou a estabilidade térmica das amostras, e que a diferentes tratamentos térmicos e a dopagem com diferentes fontes de európio influenciaram sensivelmente o ambiente de coordenação dos íons Eu(III) nos materiais híbridos orgânico-inorgânicos.application/pdfporMetais de terras-rarasMetil metacrilatoIonsLuminescênciaRaios X - DifraçãoPolimetilmetacrilatoMateriais híbridosLantanídeosDifrationIonsLuminescenceMethyl methacrylatePolymethylmethacrylateRare earth metalsX-raysLanthanidesCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICASíntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPós-Graduação em Químicainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSORIGINALSIMEI_TARSE_SOBRINHO_SANTOS.pdfapplication/pdf6063188https://ri.ufs.br/jspui/bitstream/riufs/6058/1/SIMEI_TARSE_SOBRINHO_SANTOS.pdf2629662d16152d4401fb07638c097d8fMD51TEXTSIMEI_TARSE_SOBRINHO_SANTOS.pdf.txtSIMEI_TARSE_SOBRINHO_SANTOS.pdf.txtExtracted texttext/plain134067https://ri.ufs.br/jspui/bitstream/riufs/6058/2/SIMEI_TARSE_SOBRINHO_SANTOS.pdf.txt75487d7e4d1c47e2642f3db6ea2d4a56MD52THUMBNAILSIMEI_TARSE_SOBRINHO_SANTOS.pdf.jpgSIMEI_TARSE_SOBRINHO_SANTOS.pdf.jpgGenerated Thumbnailimage/jpeg1613https://ri.ufs.br/jspui/bitstream/riufs/6058/3/SIMEI_TARSE_SOBRINHO_SANTOS.pdf.jpgb6953e70eff25189359f4d56b80eab5cMD53riufs/60582018-01-16 19:59:49.071oai:ufs.br:riufs/6058Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2018-01-16T22:59:49Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.por.fl_str_mv |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
title |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
spellingShingle |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) Santos, Simei Tarse Sobrinho Metais de terras-raras Metil metacrilato Ions Luminescência Raios X - Difração Polimetilmetacrilato Materiais híbridos Lantanídeos Difration Ions Luminescence Methyl methacrylate Polymethylmethacrylate Rare earth metals X-rays Lanthanides CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
title_full |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
title_fullStr |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
title_full_unstemmed |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
title_sort |
Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III) |
author |
Santos, Simei Tarse Sobrinho |
author_facet |
Santos, Simei Tarse Sobrinho |
author_role |
author |
dc.contributor.author.fl_str_mv |
Santos, Simei Tarse Sobrinho |
dc.contributor.advisor1.fl_str_mv |
Sarmento, Victor Hugo Vitorino |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3877813942036939 |
contributor_str_mv |
Sarmento, Victor Hugo Vitorino |
dc.subject.por.fl_str_mv |
Metais de terras-raras Metil metacrilato Ions Luminescência Raios X - Difração Polimetilmetacrilato Materiais híbridos Lantanídeos |
topic |
Metais de terras-raras Metil metacrilato Ions Luminescência Raios X - Difração Polimetilmetacrilato Materiais híbridos Lantanídeos Difration Ions Luminescence Methyl methacrylate Polymethylmethacrylate Rare earth metals X-rays Lanthanides CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Difration Ions Luminescence Methyl methacrylate Polymethylmethacrylate Rare earth metals X-rays Lanthanides |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
In this work siloxane-polymethyl methacrylate (PMMA) hybrid materials were synthesized and doped with Eu (III) from solid europium chloride, solid europium (III) nitrate, europium chloride (III) in alcoholic solution and 3-aminopyrazine-2-carboxylate of lanthanum and europium complex. The hybrid was prepared from methyl methacrylate (MMA) and 3-methacryloxy-propyl-trimethoxysilane (MPTS), using benzoyl peroxide (BPO) as polymerization initiator. The use of the sol-gel method by acid catalysis allowed to obtain pure solid materials and doped with europium different sources with amorphous characteristics, as evidenced by the X-ray diffraction powderdata. The insertion of the europium complex in the polycrystalline matrix did not changethe structural characteristics of the samples. It was observed that the materials doped with europium in solution, showed greater adsorbed amounts of solvents and structural features that changethe spectroscopic properties. The samples containing solid salts showed similar structural features. It was observed that the average life time of the radioactive emissions increase with the heat treatment, indicating that the temperature reduces the number of suppressor luminescence groups in the coordinationenvironment oflanthanides ion and the character non monoexponentialof the decay is indicative of the presence different coordination environments. In the 29Si NMR measurementsfor samples containing alcoholic solution of europium chloride are observed monomer (RSi(OSi)(OH)2), diimeric(R-Si(OSi)2(OH)) and fully condensed (RSi(OSi)3)species,having a polycondensationdegree up to 78% . The materialsdoped with europium complex show strong luminescence, except tosamples treated at 200 ° C, which is indicative of thermal degradation of the coordination complex. It was observed that presence of solvent changedthermal stability, different heat treatments and europium sources exerted strong influence on the coordination environment of the Eu (III) ions in the organic -inorganic hybrid materials. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014-03-28 |
dc.date.accessioned.fl_str_mv |
2017-09-27T13:57:26Z |
dc.date.available.fl_str_mv |
2017-09-27T13:57:26Z |
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 |
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https://ri.ufs.br/handle/riufs/6058 |
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https://ri.ufs.br/handle/riufs/6058 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Pós-Graduação em Química |
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