Polimerization
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. PREPARATION FOR SUPPORTING COMPOSITE POLIANYLINE IN MATRIZES OF COPOLYMERS ESTYRENE-DIVINYLBENZENE AND STUDIES OF ADSORPTION BY EXCHANGE IONIC OF COMPLEX ANIONS OF [FeCl4]- AND [CuCl4] 2- / PREPARAÇÃO DE COMPÓSITOS DE POLIANILINA EM MATRIZES DE COPOLÍMEROS ESTIRENO-DIVINILBENZENO E ESTUDOS DE ADSORÇÃO POR TROCA IÔNICA DE ÂNIONS COMPLEXOS DE [FeCl4]- E [CuCl4]2-
In this work, composites of dispersed polyaniline in beads of styrenedivinybenzene copolymer (Pani/Sty-DVB copopolymer) with different porosities were prepared through in situ polymerization. Materials with high surface areas and high porosities were obtained what explain their properties to adsorve transition metals. SD29 and SD84 copolymers were prepared t
Publicado em: 2008
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14. PREPARATION FOR SUPPORTING COMPOSITE POLIANYLINE IN MATRIZES OF COPOLYMERS ESTYRENE-DIVINYLBENZENE AND STUDIES OF ADSORPTION BY EXCHANGE IONIC OF COMPLEX ANIONS OF [FeCl4]- AND [CuCl4] 2- / PREPARAÇÃO DE COMPÓSITOS DE POLIANILINA EM MATRIZES DE COPOLÍMEROS ESTIRENO-DIVINILBENZENO E ESTUDOS DE ADSORÇÃO POR TROCA IÔNICA DE ÂNIONS COMPLEXOS DE [FeCl4]- E [CuCl4]2-
Neste trabalho, foram preparados e caracterizados compósitos de polianilina (Pani) dispersa em esferas de copolímeros estireno-dinvilbenzeno com diferentes porosidades, através da polimerização oxidativa "in situ". Obteve-se materiais com altas áreas superficiais específicas e porosidades, que conferiu aos mesmos, características adsorventes para met
Publicado em: 2008
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15. Preparation and reative studies of catalytic systems based on zirconocenes, face to homo-and co-polimerization reation of etene / Preparação e estudo de reatividade de sistemas catalíticos, a base de zirconocenos, frente à reação de homo- e copolimerização de eteno
Catalytic systems based on zirconoces which are able to polymerize ethene have been studied. Structural modifications on the basic catalytic precursor, diphenylmethylidene(η5- cyclopentadienyl)(η5-9-fluorenyl) zirconium dichloride (5a) have been carried out. The catalytic precursors 5a and bis(para-fluorophenyl)methylidene(η5-cyclopentadienyl)
Publicado em: 2007
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16. Development of Carboxylated Nitrile Latices / Desenvolvimento de Látices Nitrílicos Carboxilados
In this dissertation an emulsion polymerization process of acrylonitrile, butadiene and carboxylic acid was studied, in pilot scale, for the production of carboxylated nitrile latex with high solids content directly from the reaction process, without the need of post-reaction steps of concentration. It was studied the effect of temperature, type and amount o
Publicado em: 2006
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17. Fases estacionarias de silica e polibutadieno para cromatografia liquida de alta eficiencia
The purpose of this work is the development of a stationary phase (SP) for Reversed-Phase High-Performance Liquid Chromatography (RP-HPLC) applications, using polybutadiene (PBD) polymer sorbed and/or immobilized onto the surface of a porous silica support. The procedure of sorption consisted of the deposition of PBD onto the silica, obtaining the sorbed SP
Publicado em: 2004
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18. Chacacterization, modeling and computacional simulation on dynamics of neural cells connections and growth / Caracterização, modelagem e simulação matemático-computacional da dinâmica do crescimento e conexões de células neurais
In this thesis we report the investigation and simulation of dynamic models of neural growing, and their characterization using shape features, considering the form function relationship and neuromorphometry. The thesis begins by presenting an overview about neuroscience, neural cell biology and the biological factors that affects the neuron form development
Publicado em: 2003
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19. Influencia do metodo de polimerização, da espessura da base e da presença de dentes na adaptação de proteses totais superiores
With the objetive of improving the adaptation of total prostheses and like this the pattem of the patients life, several authors have been dedicating the life in researches that seek to improve or at least to minimize this problem. Several factors can contribute to the desadaptation to bases of prostheses, among them are the thickness, the uncontrolled incre
Publicado em: 1999
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20. Influencia dos ciclos de polimerização sobre a adaptação das bases de protese total confeccionadas com resina acrilica QC-20
O objetivo deste estudo foi avaliar as alterações de adaptação em bases de prótese total, confeccionadas com resina acrílica de rápida polimerização (QC-20) em função das técnicas de polimerização. Foram confeccionados 15 modelos em gesso pedra a partir da moldagem de um modelo mestre metálico. Sobre estes modelos foram confeccionadas bases de
Publicado em: 1999
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21. Influencia da distancia da ponta ativa do fotopolimerizador no grau de dureza Knoop de compositos odontologicos
The purpose of this study was to investigate the effect af light-tip distance on Knoop hardness degree, in different depth, of two composite resms. Two composite resins (Z100 and Silux Plus, colors A3 and U (3M) and a light-curing unit XL 3000 (3M) with 750 mW/cm2of light intensit were used in this study. Specimens with 5 mm in diameter and 2,5 mm thick were
Publicado em: 1998
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22. Preparação de microesferas poliestirenicas aminadas atraves de copolimerização entre estireno e aminoestireno para utilização em testes imunologicos
The synthesis of the functionalized PS particles containing amino-groups on their surfaces, was the subject of study in the present work. It consisted of two different steps of the research: development of a method for polymerization of styrene, resulting in homogeneous particle size distribution; application of the developed method to prepare PS particles c
Publicado em: 1998
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23. Estabilização de latex polimericos por sorção de solventes organicos
The colloidal stability with regard to NaCI addition of homopolymer (PS-M and PS-LEV) polystyrene latexes and copolymer (P(SBMA), PS/PBMA and PBMA/PS) poly[styrene-co- butylmethacrylate)] latexes was modified by particle swelling with toluene and chloroform vapor, at 25°C. The latexes were obtained by aqueous emulsion polymerization. K2S2O4 and Na2S204 were
Publicado em: 1998
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24. Estudo do processo de deposição e das propriedades estruturais e opticas de filmes polimericos preparados em plasmas de C2 H2, C2 H2-SF6 e hexametildisiloxano
Plasma polimerization amorphous thin films were deposited in glow discharge plasmas of C2H2, C2H2 - SF6, C2H2 - Ar, and hexamethyldisiloxane ( HMDS ). Both the discharges and films were studied. Two vaccum systems have been used for the depositions. In one of the systems, d.c. discharge was sustained between two circular parallel plate electrodes, inside a s
Publicado em: 1992