Water Soluble Polymers
Mostrando 1-12 de 60 artigos, teses e dissertações.
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1. Geopolymer/PEG Hybrid Materials Synthesis and Investigation of the Polymer Influence on Microstructure and Mechanical Behavior
Geopolymers are aluminosilicate inorganic polymers, obtained from the alkali activation of powders containing SiO2+Al2O3>80wt%, mainly proposed as environmentally friendly building materials. In this work, metakaolin-based geopolymers have been prepared and a water-soluble polymer, polyethylene glycol (PEG), has been added in different percentages to obtain
Mat. Res.. Publicado em: 25/08/2015
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2. Composition of pectic polysaccharides in a Portuguese apple (Malus domestica Borkh. cv Bravo de Esmolfe)
Malus domestica Borkh. cv Bravo de Esmolfe is a typical Portuguese apple cultivar classified as Protected Designation and Origin (PDO). It is a traditional product produced under strict conditions and labelled with a specific law protected designation. This cultivar presents quite good sweetness and flavor. The monosaccharide composition of the pectic polysa
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-08
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3. Efeitos da molhabilidade e adesão em sistemas sólido-suspensão e filme-suspensão no desempenho do recobrimento em leito de jorro / Effects of wettability and adhesion of solid-suspension and film-suspension systems on spouted bed coating performance
O recobrimento de partículas é uma operação presente em vários setores industriais e tem como objetivo modificar as propriedades de superfície influenciando diretamente na qualidade, estabilidade e proteção do produto final. O principal enfoque deste trabalho foi aprimorar o estudo de recobrimento em termos de tensão superficial do sólido e caracte
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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4. Multicomponent complex formation between pyrimethamine, cyclodextrins and water-soluble polymers
The combined effect of hydroxypropyl-β-cyclodextrin (HPβCD) and polyvinylpyrrolidone (PVP) or sodium carboxymethylcellulose (CMC) on the solubility of pyrimethamine (PYR) was studied. Equimolar PYR-HPβCD solid systems, in the presence or the absence of 0.25% (w/v) PVP or 0.10% (w/v) CMC were prepared by coevaporation or freeze-drying, and characterized by
Brazilian Archives of Biology and Technology. Publicado em: 2011-10
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5. Aplicação de ciclodextrinas em processos têxteis
Cyclodextrins (CDs) are water soluble cyclic sugars with a hydrophobic nanometric cavity that permits the formation of host/guest inclusion complexes with a large variety of molecules, alternating their physical-chemical properties. In the present review CD research related to the processing of textiles is revised and discussed. CDs may function as encapsula
Química Nova. Publicado em: 2010
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6. Fotodegradação de polímeros solúveis em água e moléculas modelo via processos oxidativos avançados / Photodegradation of water soluble polymers and model molecules via advanced oxidative processes
The aim of this work was to investigate polymer photodegradation mechanisms and stabilizing agents. The course of photooxidative degradation of some water soluble polymers (poly(vinylpyrrolidone), PVP; poly(acrylamide), PAM and poly(ethylene glycol), PEG) in the presence of hydrogen peroxide, Fenton reagent and iron salt has been investigated. PVP showed the
Publicado em: 2008
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7. Photochemical degradation study of aqueous solutions of polyrthyleneglicol, polyacrylamide and polyvinylpyrrolidone. / Estudo da degradação fotoquímica de soluções aquosas de polietilenoglicol, poliacrilamida e polivinilpirrolidona.
The aim of this work is to apply advanced oxidative processes to study the degradation of industrial wastewater containing water-soluble polymers. Kinetic constants of reactions involved in the oxidation processes were calculated by molecular modeling. In the experimental part the degradation of polyvinylpirrolidone (PVP), polyacrylamide (PAM) and polyethyle
Publicado em: 2007
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8. Sistema aquoso bifásico: uma alternativa eficiente para extração de íons
Solvent extraction has been successfully applied to metal ion preconcentration and often meant the use of toxic organic diluents. However, regulatory pressure is increasingly focusing on the use and disposal of organic solvents, and thus the development of nonhazardous alternatives is important. In this review, we examine the application of aqueous biphasic
Química Nova. Publicado em: 2006-12
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9. Fração orgânica de biossólidos e efeito no estoque de carbono e qualidade da matéria orgânica de um Latossolo cultivado com eucalipto. / Organic fraction of the biosolids and effect on carbon stocks and organic matter quality in an oxisol planted with eucalyptus.
The aim of this work was to characterize the organic fraction decomposition process of the biosolids in soil, correlating to initial organic matter (OM) composition of residue. Another objective was quantify, under field conditions, the effect of alkaline biosolid on Oxisol OM, in a site planted with eucalyptus and after five years of the residue application
Publicado em: 2004
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10. Analise das influencias das caracteristicas do solido e da supensão no processo de recobrimento em leito de jorro
O recobrimento de partículas em leito de jorro tem aplicações em diversos produtos como comprimidos, cosméticos, alimentos, sementes, fertilizantes, etc. No processo de recobrimento o desempenho é dependente de um conjunto de características do sólido a ser recoberto, da suspensão de revestimento, da adesão líquido-sólido e das condições operaci
Publicado em: 2004
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11. Nutrição mineral no crescimento e no metabolismo de carboidratos soluveis em Vernonia herbacea (Vell.) Rusby
Vernonia herbacea is a herbaceous, perem1ial Asteraceae, native to the Brazilian cerrado. The plants have underground organs, known as rhizophores, which accumulate :fructans of the inulin type. Fructose polymers have been associated to stress conditions, such as water and nutritional defficiency and low temperatures acting as osmotic regulators for the plan
Publicado em: 2003
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12. Propriedades Ópticas de Semicondutores Orgânicos à Base de Polímeros Emissores de Luz / Optical proprieties of organic semiconductors based on light emitting polymers.
In this work, we studied the optical proprieties of absorption and emission of luminescent conjugated polymers based on poly(p-phenylene vinylene) (PPV). This material was processed in thin films by casting, spin-coating, self-assembled (SA) e Langmuir-Blodgett (LB) techniques, available in the Grupo de Polímeros Bernhard Gross, where the samples were chara
Publicado em: 2001