Silsesquioxane
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Sobre reformas y políticas sanitarias en la España de los últimos años del franquismo y la transición democrática
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in wate
Hist. cienc. saude-Manguinhos. Publicado em: 2020-10
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2. Synthesis and Characterization of Hybrid Polymer Based on Functionalized Silica as Efficient Adsorbent for Heavy Metal Ions from Aqueous Solution
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in wate
J. Braz. Chem. Soc.. Publicado em: 2020-10
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3. Polyhedral Oligomeric Silsesquioxane (POSS) as Reinforcing Agent for Waterborne Polyurethane Coatings on Wood
Polyhedral oligomeric silsesquioxane (POSS) was added as a reinforcing agent in waterborne polyurethane (WPU)-based coatings to improve their properties. The morphology, structure, thermal stability as well as mechanical properties of the resulting WPU and WPU/POSS hybrid films were investigated. The good compatibility of POSS in the WPU matrices was demonst
Mat. Res.. Publicado em: 04/01/2019
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4. Effects of polypropylene methyl polyhedral oligomeric silsesquioxanes and polypropylene-grafted maleic anhydride compatibilizers on the properties of palm kernel shell reinforced polypropylene biocomposites
Abstract The effects of the polypropylene-grafted maleic anhydride (PP-g-MAH) and polypropylene methyl polyhedral oligomeric silsesquioxane (PP-POSS) compatibilizers on the mechanical, thermal and physical properties of palm kernel shell (PKS) reinforced polypropylene (PP) were investigated. The production of PP/PKS biocomposites was performed by melt mixing
Polímeros. Publicado em: 04/08/2016
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5. Marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS)
Marginal integrity is one of the most crucial aspects involved in the clinical longevity of resin composite restorations. Objective To analyze the marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS). Material and Methods A base composite (B) was produced with an organic matrix with UDMA/
J. Appl. Oral Sci.. Publicado em: 2015-10
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6. Silver nanoparticle thin films deposited on glass surface using an ionic silsesquioxane as stabilizer and as crosslinking agent
Thin films containing silver nanoparticles homogeneously dispersed, with narrow size distribution below 10 nm, were synthesized on flat glass surface, by using an ionic silsesquioxane as stabilizer and crosslinking agent. The films can be prepared without previous functionalization of substrate surfaces and without addition of other components. The films wer
J. Braz. Chem. Soc.. Publicado em: 2015-05
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7. Synthesis of Poly(Dimethylsiloxane) Networks Functionalized with Imidazole or Benzimidazole for Copper(II) Removal from Water
Functionalized elastomeric networks were obtained via a polycondensation reaction between poly(dimethylsiloxane) (PDMS) containing Si(CH3)2OH as end groups and an imidazole- or benzimidazole-modified alkoxysilane. The structure of the polymeric materials was characterized via attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and
J. Braz. Chem. Soc.. Publicado em: 2015-02
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8. Influence of the polyhedral oligomeric silsesquioxane n-phenylaminopropyl: POSS in the thermal stability and the glass transition temperature of epoxy resin
In this study, epoxy nanocomposites containing different fractions of n-phenylaminopropyl (POSS) were prepared. The nanocomposites were studied by transmission electron microscopy (TEM), gel content, dynamic-mechanical analysis (DMA) and thermogravimetric analysis (TGA). The parameters for Avrami's equation were calculated from the degradation curves. The di
Polímeros. Publicado em: 18/06/2013
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9. Electrochemical behavior of hydroquinone and catechol at a silsesquioxane-modified carbon paste electrode
Um eletrodo de pasta de carbono modificado com o polímero cloreto de 3-n-propil-4-picolina silsesquioxano foi testado como sensor para isômeros do di-hidroxibenzeno. O sensor apresentou desempenho excelente para a determinação eletroanalítica simultânea de hidroquinona e catecol. As curvas de calibração obtidas foram lineares na faixa de concentraç�
J. Braz. Chem. Soc.. Publicado em: 2013-04
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10. PREPARAÇÃO E CARACTERIZAÇÃO DE FILMES LbL DE FTALOCIANINA DE NÍQUEL E POLIELETRÓLITO SILSESQUIOXANO
As pesquisas voltadas para o desenvolvimento de sensores eletroquímicos a base de filmes LbL têm crescido exponencialmente nos últimos anos. Neste âmbito, este trabalho relata o desenvolvimento de um sensor eletroquímico, utilizando a técnica Layer-by-Layer (LbL), a qual possibilita a construção de filmes ultrafinos a partir de interações eletrost�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/03/2012
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11. Thermoplastic polyurethane synthesis using POSS as a chain modifier
In this study, thermoplastic polyurethanes (TPUs) were synthesized using the one-shot process in solution. To obtain the samples n-phenylaminopropyl polyhedric oligomeric silsesquioxane (POSS) was added as a chain modifier during the synthesis in four different amounts. The samples were characterized by infrared spectroscopy (FTIR), thermogravimetric analysi
Materials Research. Publicado em: 31/07/2012
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12. A water soluble 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octanechloride silsesquioxane grafted onto Al/SiO2 surface : chromium adsorption study
O material octanocloreto de 3-n-propil-1-azonia-4-azabiciclo[2.2.2] silsesquioxano (dabcosil silsesquioxano) solúvel em água foi obtido. O dabcosil silsesquioxano foi enxertado na superfície da sílica, previamente modificada com óxido de alumínio. O material sólido resultante dabcosil-Al/SiO2, apresentou 0,15 mmol de grupamentos dabco por grama do mat
Publicado em: 2010