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  • 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

Prepara??o de nanocomp?sitos de poli?steres arom?ticos/TiO2 por polimeriza??o In SITU

Santos, Leonardo Moreira dos 09 August 2013 (has links)
Made available in DSpace on 2015-04-14T13:59:01Z (GMT). No. of bitstreams: 1 451408.pdf: 2001756 bytes, checksum: 64067e77cbea30ac7596f0d09843bc92 (MD5) Previous issue date: 2013-08-09 / Due to search for different properties in polymeric materials, have increasing studies in the composites and the nanocomposites field, using inorganic fillers. Within this context one this work, which has as main objective to study experimentally the synthesis and characterization of nanocomposites of aromatic polyesters / titanium dioxide (PEA/TiO2), using raw materials trade. To do so, it was used the in situ polymerization technique to prepare the nanocomposites with PEA/TiO2 with different concentrations of the load (0%, 0.5%, 1.0%, 2.0%, 3.0% and 5.0% m/m of the polymer mass). It was used as starting materials: dimethyl terephthalate (DMT), polyethylene terephthalate (PET) and a mixture of 1,4-butanediol and 1,6-hexanediol. The nanocomposites were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and Gel Permeation Chromatography (GPC). Shore D hardness, contact angle and X-ray Diffraction (DRX). The results show that there was an interaction filler/polymer evidenced by XRD and FTIR analysis. The thermal properties of nanocomposites suffered no significant changes. It was also possible to observe a change in the surface of the synthesized material indicating good compatibility btween filler and polymeric matrix and a decrease of surface hydrophilicity (measured by the contact angle) as well as an increase in hardness of the material compared to pure polymer. / Devido ? busca de propriedades diferenciadas em materiais polim?ricos, t?m-se um aumento crescente nos estudos de comp?sitos e nanocomp?sitos utilizando cargas inorg?nicas. Dentro deste contexto insere-se este trabalho, que tem como objetivo principal estudar, experimentalmente, a s?ntese e a caracteriza??o de nanocomp?sitos de poli?steres arom?ticos/di?xido de tit?nio (PEA/TiO2), utilizando-se mat?rias-primas comerciais. Para isso, utilizou-se a t?cnica de polimeriza??o in situ para preparar nanocomp?sitos de PEA/TiO2 com diferentes concentra??es da carga (0%, 0,5%, 1,0%, 2,0%, 3,0% e 5,0% m/m sobre a massa do pol?mero). Utilizou-se como reagentes iniciais: o Dimetil Tereftalato (DMT), o Politereftalato de Etileno (PET) e uma mistura de 1,4- butanodiol e 1,6- hexanodiol. Os nanocomp?sitos preparados foram caracterizados por Espectroscopia de Infravermelho por Transformada de Fourier (FTIR), Microscopia Eletr?nica de Varredura (MEV), Calorimetria Diferencial Explorat?ria (DSC), An?lise Termogravim?trica (TGA), Cromatografia em Permea??o em Gel (GPC), Dureza Shore D, ?ngulo de contato e Difra??o de Raios- X (DRX). Pelos resultados obtidos neste trabalho, pode-se ressaltar que houve intera??o carga/pol?mero comprovada pelas an?lises de DRX e FTIR onde as mesmas interferiram nas intensidades das bandas proporcionais a quantidade de carga adicionada. As propriedades t?rmicas do material analisadas por DSC e TGA n?o sofreram modifica??o significativa. Tamb?m foi poss?vel observar uma mudan?a na superf?cie do material sintetizado mostrando uma boa compatibilidade da carga com a matriz polim?rica e uma diminui??o da hidrofilicidade da superf?cie (avaliada atrav?s do ?ngulo de contato), al?m de um aumento na dureza do material quando comparado ao pol?mero puro.

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