Polymeric Pyrolysis
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Influence of the pH on Al2O3:CuO pigments prepared by a polymeric precursor method
Copper (II) aluminate, CuAl2O4, which is known to be an inverse spinel contains a d9 metal ion and possesses interesting electronic, magnetic and catalytic properties and is used in industry as ceramic pigments, coatings and catalysts. Al2O3 with 10 mol% Cu (AlCu10) was synthesized by the polymeric precursor method varying the pH of the precursor solution wi
Mat. Res.. Publicado em: 02/11/2012
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2. APLICAÇÃO DA AMOSTRAGEM DIRETA-GF AAS PARA A DETERMINAÇÃO DE ELEMENTOS TRAÇO EM METÉRIAS-PRIMAS PARA A PRODUÇÃO DE POLIURETANOS
Polymeric diphenylmethane diisocyanate (PMDI) and diphenylthane dianiline (MDA) are importante raw materials in the manufacture of polyurethanes. These products have wide application in various fields such as medicine, catalysis and electronics. Actually, considerable interest has been given for the presence of metal contaminants in raw materials for the pro
Publicado em: 2010
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3. A pirólise como técnica analítica
In this paper historical aspects of analytical pyrolysis, the equipment used, the fundamentals and the mechanisms of pyrolysis of different polymeric materials are discussed. The latest work on analytical pyrolysis applied to various types of synthetic and natural samples is reviewed. Current applications of this technique that are discussed include identifi
Química Nova. Publicado em: 2008
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4. Estudos em materiais vitreos e/ou ceramicos de SiCxOy e/ou SiC enriquecidos com fase dispersa de carbono / Studies in vitreous and/or ceramic materials based on SiCxOy and/or SiC enriched with dispersed carbon
In this study, vitreous and/or ceramic materials based on SiCxOy and/or SiC enriched with carbon were obtained by pyrolysis of hybrid polymeric precursors, in the presence or not of nickel acetate (NiAc). The polymeric precursors with and without NiAc were prepared by hydrosilylation reaction between poly(methylsiloxane) (PMS) and divinylbenzene (DVB), in di
Publicado em: 2008
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5. Poly(borosiloxanes) as precursors for carbon fiber ceramic matrix composites
Ceramic matrix composites (CMCs), constituted of a silicon boron oxycarbide (SiBCO) matrix and unidirectional carbon fiber rods as a reinforcement phase, were prepared by pyrolysis of carbon fiber rods wrapped in polysiloxane (PS) or poly(borosiloxane) (PBS) matrices. The preparation of the polymeric precursors involved hydrolysis/condensation reactions of a
Materials Research. Publicado em: 2007-06
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6. Characterization and pyrolysis of waste from Campos Basin: P-40 waste analysis / Caracterização e pirólise dos resíduos da Bacia de Campos: análise dos resíduos da P-40
In this study, wastes from oil and gas offshore exploration and production activities were analysed by characterization of polymeric classes and thermal analysis tests. After that, the samples of wastes generated by offshore activities were submitted to pyrolysis in inert atmosphere at 450C. The resulting liquids from this thermal treatment were characterize
Publicado em: 2006
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7. Complex-shaped ceramic composites obtained by machining compact polymer-filler mixtures
Research in the preparation of ceramics from polymeric precursors is giving rise to increased interest in ceramic technology because it allows the use of several promising polymer forming techniques. In this work ceramic composite pieces were obtained by pyrolysis of a compacted mixture of a polysiloxane resin and alumina/silicon powder. The mixture consists
Materials Research. Publicado em: 2005-06
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8. Poli(oxido de etileno-co-epicloridrina) : degradação foto-oxidativa e termica, e blenda com polipropileno
Polymers derived from ethylene oxide and epichlorohydrin, like poly(epichlorohydrin-co-ethylene oxide) elastomer, are studied as polymer electrolyte for application in photo-electrochemical devices. These materiaIs present the ability to form complexes with alkali salts, presenting high ionic conductivity. In these devices the conversion of the solar energy
Publicado em: 2003
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9. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Compósitos são materiais de engenharia heterogêneos, constituídos de um ou mais tipos de reforço, com orientação definida ou não dispersos em uma matriz que tanto pode ser cerâmica, metálica ou polimérica. A combinação adequada destes materiais permite que as propriedades intrínsecas de cada um dos componentes contribuam na formação de um nov
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/07/2000
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10. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Composites are heterogeneous materials made by one or more types of reinforcements, disposed or not in a definied direction, which is dispersed in a ceramic, metallic or polymeric matrix. The combination of these materials permits that the intrinsic properties from each one of the components contribute in the formation of a new material having characteristic
Publicado em: 2000
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11. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Compósitos são materiais de engenharia heterogêneos, constituídos de um ou mais tipos de reforço, com orientação definida ou não dispersos em uma matriz que tanto pode ser cerâmica, metálica ou polimérica. A combinação adequada destes materiais permite que as propriedades intrínsecas de cada um dos componentes contribuam na formação de um nov
Publicado em: 2000