Poly N Vinyl 2 Pyrrolidone
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Oil Removal from Produced Water by Ultrafiltration using Polysulfone Membrane
Abstract The present paper deals with the ultrafiltration (UF) of produced water using a polysulfone membrane. Membranes were prepared by the phase inversion technique using polysulfone (PSf) polymer base, poly vinyl pyrrolidone (PVP) additive and N-methyl-2-pyrrolidone (NMP) solvent. Prepared UF membranes were characterized by determining the surface morpho
Braz. J. Chem. Eng.. Publicado em: 2017-04
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2. Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers
Abstract This work describes the synthesis and applications of amphiphilic polystyrene-block-poly(N-vinyl-2-pyrrolidone) (PS-b-PVP) copolymers as a silver and silica nanoparticle surface modification agent. The synthesis of PS-b-PVP was carried out using controlled/living radical polymerization techniques. The synthesis of the block copolymers was confirmed
Polímeros. Publicado em: 15/03/2016
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3. Preparation and characterization of hydrogels with potential for use as biomaterials
Hydrogels have been extensively explored for biomedical applications due to their ability to absorb high water content in its structure, which gives excellent biocompatibility. This work aims at obtaining biocompatible hydrogels with potential for use in increasing the mechanical strength of bone substitutes, or controlled drug release. Poly (N-vinyl-2-pyrro
Mat. Res.. Publicado em: 2014-08
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4. Investigation of nanocomposites made with poly(methacrylic acid-co-methyl methacrylate)/poly(N-vinyl-2-pyrrolidone)/multi-walled carbon nanotubes
Poly(methacrylic acid-co-methyl methacrylate) (P(MAA-co-MMA)) was prepared in the presence of poly(N-vinyl-2-pyrrolidone) (PVP) and multiwalled carbon nanotubes (MWNTs) via ultrasonic assisted solution free radical polymerization, i.e., P(MAA-co-MMA)/PVP/MWNTs nanocomposites. The morphology, glassy-state storage modulus, thermal behavior and swelling charact
Polímeros. Publicado em: 2014
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5. Obtenção de membranas hidrofílicas a base de PVP (Poli N-vinil-2-pirrolidona) contendo alginato de sódio e nanocarga de pseudoboemita obtida pelo processo sol-gel
The use of hydrogels combined with various additives in tissue regeneration and wound scarring, injuries and burnings has been an option in treatments of difficult scarring, infected-bleeding wounds, burnings and other diseases whose treatments, moist and sterilized resources are required. The hydrogels based on poly (N-vinyl-2-pyrrolidone) are membranes tha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2011
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6. Desenvolvimento e avaliação da incorporação e liberação de óleo de açaí em hidrogéis de poli(N-vinil-2-pirrolidona) / Açaí oil development and evaluation of immobilization and release in poly (N-vinyl-pyrrolidone) hydrogels
O açaí (Euterpe oleracea) é uma palmeira nativa do Brasil, distribuída por toda a bacia amazônica. Rico em ácidos graxos essenciais (principalmente o ácido oleico e o ácido linoleico), o óleo de açaí previne condições anormais da pele, como dermatites, escamações e ressecamento, e auxilia no processo de regeneração do tecido epitelial. Conhe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/2010
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7. Incorporação e liberação de resveratrol em hidrogéis poliméricos / Resveratrol immobilization and release in polymeric hydrogels
Resveratrol (3, 4, 5-trihydroxystilbene) is a polyphenolic produced by a wide variety of plants in response to injury and found predominantly in grape skins. This active ingredient has been shown to possess benefits for the health, such as the antioxidant capacity which is related to the prevention of several types of cancer and skin aging. However, the oral
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2010
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8. Preparation of PVP hydrogel nanoparticles using lecithin vesicles
Hydrogels micro, sub-micro and nanoparticles are of great interest for drug encapsulation and delivery or as embolotherapic agents. In this work it is described the preparation of nano and sub-microparticles of pre-formed, high molecular weight and monomer free poly(N-vinyl-2-pyrrolidone) encapsulated inside the core of lecithin vesicles. The hydrogel partic
Química Nova. Publicado em: 2010
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9. Reticulação de compostos poliméricos para recobrimento de superfícies
Coating of cotton fiber is employed in the textile industry in order to increase the mechanical resistance of the yarns, that is, resistance to vibration, friction, impact and elongation, which are some of the forces the yarn is subjected during the weaving process. The choice of the coating material is extremely important, since it can provide the best perf
Publicado em: 2009
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10. Preparation and Characterization of Hydrogels from Mixtures of Chitosan and Poly(N-Vinyl-2-Pyrrolidone) / Preparação e caraterização de hidrogéis a partir de misturas de soluções de quitosana e poli(N-vinil-2-pirrolidona)
Polymer blends are physical mixtures of two or more polymers. The interest in obtaining polymer blends, with desired physical and chemical characteristics for the most diverse applications, is increasing in the whole world. In this work, chitosan and poly(N-vinyl-2-pyrrolidone) (PVP) blend films were developed at several ratios. Hydrogels were also obtained
Publicado em: 2008
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11. SÃntese e caracterizaÃÃo de nanopartÃculas de nÃquel para Ãptica nÃo linear / SÃntese e caracterizaÃÃo de nanopartÃculas de nÃquel para Ãptica nÃo linear
In this work, we describe the synthesis of nickel nanoparticles (NPs) stabilized using poly (vinyl pyrrolidone), their structural and optical (linear and nonlinear) characterization. In Chapter 1 we present a general introduction describing the work performed. In Chapter 2 it is presented a review of nickel NPsâ properties and some synthesis processes. In C
Publicado em: 2008