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Previous issue date: 2012-01-27 / Due to the demand of the current market of polymeric materials and materials based on a polymeric structure, as some composites and nanocomposites, the development of new materials is fundamental. Thus, this work aims to study the synthesis and experimental characterization of nanocomposites polyurethane/titanium dioxide, using commercial raw materials. The nanocomposites were synthesized by in situ polymerization reactions in which an inorganic filler was added, titanium dioxide (TiO2), in the following proportions by weight in relation to the mass obtained from the pure polymer: 0.5%, 1.0%, 2.0%, 3.0%, 5.0%, 7.0% e 10.0%. These reactions were based in poli(-caprolactone) (PCL) and 1,6-diisocyanate hexane (HDI). The materials were characterized by Infrared Spectroscopy Fourier Transform (FTIR), Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry Analysis (DSC), Thermo-gravimetric analysis (TGA) and Thermodynamic and Mechanical Analysis (TDMA). Analyzing the results obtained, the materials that showed better thermo-mechanical performance were the polymers with 2.0, 3.0 and 5.0% of TiO2. Although showing a lower degradation temperature when compared to the materials with 7.0 and 10.0% of TiO2, the additions of 2.0, 3.0 and 5.0% proved to be the most efficient in tensile tests. It can be concluded that the nanocomposites synthesized by in situ polymerization showed, in general, superior thermal properties (degradation temperature) and mechanical properties when compared to the pure polymer. It is noteworthy that there was no need of any kind of treatment in the commercial filler, which leads to a reduction in the cost of the process / Devido ? grande demanda do mercado atual de materiais polim?ricos e de materiais baseados em uma estrutura polim?rica, como alguns comp?sitos e nanocomp?sitos, torna-se fundamental a busca e o desenvolvimento de novos materiais. Desta forma, neste trabalho foram estudadas experimentalmente a s?ntese e a caracteriza??o de nanocomp?sitos de poliuretano/di?xido de tit?nio, utilizando-se mat?rias primas comerciais. Nestas rea??es foram adicionados 0,5%, 1,0%, 2,0%, 3,0%, 5,0%, 7,0% e 10% em massa de di?xido de tit?nio (TiO2), levando em conta a massa de poliuretano formada na rea??o da Poli (-caprolactona) diol (PCL) e do 1,6-diisocianato de hexametileno (HDI). Os materiais foram caracterizados por Espectrometria de Infravermelho por Transformada de Fourier (FTIR), Microscopia Eletr?nica de Varredura (MEV), Calorimetria Diferencial Explorat?ria (DSC), An?lise Termo-Gravim?trica (TGA) e An?lise Termodin?mico-Mec?nica (DMA). Pela an?lise dos resultados obtidos, os materiais que apresentaram melhor desempenho termo-mec?nico foram os pol?meros com 2,0, 3,0 e 5,0% de TiO2. Apesar de apresentar uma temperatura de degrada??o inferior aos materiais com quantidades superiores de carga, as adi??es de 2,0, 3,0 e 5,0% mostraram-se as mais eficientes nos ensaios de tra??o. Concluiu-se ent?o que os nanocomp?sitos sintetizados por polimeriza??o in situ apresentaram, de forma geral, propriedades t?rmicas (temperatura de degrada??o) e mec?nicas superiores ao pol?mero puro. Ressalta-se, ainda, n?o haver necessidade de qualquer tratamento pr?vio na carga comercial utilizada, o que leva a uma redu??o no custo do processo
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/3194 |
| Date | 27 January 2012 |
| Creators | Silva, Vin?cius Dem?trio da |
| Contributors | Einloft, Sandra Mara Oliveira |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Engenharia e Tecnologia de Materiais, PUCRS, BR, Faculdade de Engenharia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -7432719344215120122, 500, 600, -655770572761439785 |
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