Acrylic Acid
Mostrando 25-36 de 99 artigos, teses e dissertações.
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25. Synthesis and properties of collagen-g-poly(sodium acrylate-co-2-hydroxyethylacrylate) superabsorbent hydrogels
Novel biopolymer-based superabsorbent hydrogels were prepared by grafting crosslinked poly(acrylic acid-co-2-hydroxyethyl acrylate) (PAA-co-PHEA) chains onto collagen backbones through a free radical polymerization method. The graft copolymerization reaction was carried out in a homogeneous medium and in the presence of ammonium persulfate (APS) as initiator
Braz. J. Chem. Eng.. Publicado em: 2013-06
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26. Effect of compatibilization and reprocessing on the isothermal crystallization kinetics of polypropylene/wood flour composites
Numerous studies have focused on polymer mixtures aimed at the potential applications of these materials. This work analyzed the effect of polymer reprocessing and the type and concentration of compatibilizer on the isothermal crystallization kinetics of polypropylene/wood flour composites. The composites, which were polypropylene grafted with acrylic acid (
Polímeros. Publicado em: 28/05/2013
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27. Microstructural and topographic characterization of concrete protected by acrylic paint
Concrete structures must be designed and constructed so as to resist the conditions established in the project design and suffer no deterioration for many years. In highly aggressive environments, in addition to the minimum layer covering the framework, the concrete must receive a protective coating. In this work, the efficiency of acrylic paint as a protect
Mat. Res.. Publicado em: 22/03/2013
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28. Modification of hydrophobic polypeptide-based film by blending with hydrophilic poly(acrylic acid)
In this study, a series of poly(γ-benzyl L-glutamate)/poly(acrylic acid) (PBLG/PAA) polymer blend films were prepared by casting the polymer blend solution in dimethylsulfoxide (DMSO). The structure and morphology of the polymer blend film were investigated by Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM). Thermal, m
Polímeros. Publicado em: 06/02/2013
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29. Oxidative dehydration of glycerol to acrylic acid over vanadium-impregnated zeolite beta
A desidratação oxidativa do glicerol a ácido acrílico foi estudada com o uso de zeólita Beta impregnada com vanádio. Os catalisadores foram preparados por impregnação úmida do metavanadato de amônio sobre a zeólita Beta na forma amoniacal, seguida de calcinação em ar a 823 K. A impregnação reduziu a área superficial específica, mas não afet
J. Braz. Chem. Soc.. Publicado em: 2013-01
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30. Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono
Fluids prepared with water, polyacrylamide (PAM) and carbon nanotubes (CNT) were studied viscosity and light scattering measurements. A previous characterization of PAM and CNT materials was also carried out. The carbon nanotube has a multi-walled structure, functionalized with 5% mass of acidic groups (MWCNT-COOH). Moreover, the CNT sample presents high pur
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/07/2011
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31. Production of bone cement composites: effect of fillers, co-monomer and particles properties
Artificial bone cements (BCs) based on poly(methyl methacrylate) (PMMA) powders and methyl methacrylate (MMA) liquid monomer also present in their formulation small amounts of other substances, including a chemical initiator compound and radiopaque agents. Because inadequate mixing of the recipe components during the manufacture of the bone cement may compro
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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32. Effect of leaching residual methyl methacrylate concentrations on in vitro cytotoxicity of heat polymerized denture base acrylic resin processed with different polymerization cycles
OBJECTIVES: Residual methyl methacrylate (MMA) may leach from the acrylic resin denture bases and have adverse effects on the oral mucosa. This in vitro study evaluated and correlated the effect of the leaching residual MMA concentrations ([MMA]r) on in vitro cytotoxicity of L-929 fibroblasts. MATERIAL AND METHODS: A total of 144 heat-polymerized acrylic res
J. Appl. Oral Sci.. Publicado em: 27/05/2011
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33. Esterificação enzimática para síntese de acrilato de sacarose / Enzymatic esterification of sucrose acrylate
O presente trabalho determinou as constantes cinéticas e de equilíbrio para a produção de acrilato de sacarose a partir da esterificação direta do ácido acrílico com sacarose catalisada pela lípase comercial de Candida antarctica (Novozym 435). Para alcançar o objetivo proposto foram estudadas as melhores condições para a síntese do acrilato de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/10/2010
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34. Production of acrylates of fructose by biocatalysis / Obtenção de acrilatos de frutose por biocatalise
O presente trabalho estudou as melhores condições para a produção de monoacrilato de frutose a partir da esterificação de ácido acrílico com D-frutose catalisada pela lípase comercial de Cândida antárctica (Novozyme 435). O interesse na produção deste éster se dá devido à promissora propriedade absorvente de água do polímero a ser produzido
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2010
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35. Antibacterial activity of chitosan and the interpolyelectrolyte complexes of poly(acrylic acid)-chitosan
A atividade antimicrobiana de quitosana e complexos interpolieletrolíticos hidrossoluvéis de poli(ácido acrílico)-quitosana foi estudada. Quitosanas de dois diferentes pesos moleculares foram testados em diferentes concentrações, 0,5 a 5 g • L-1, como agentes antimicrobianos nas P. aeruginosa e P. oleovorans. Em ambos os casos, obteu-se a melhor inib
Brazilian Archives of Biology and Technology. Publicado em: 2010-06
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36. Production nd control of the acrylic acid ester synthesis through lactic acid fermentation / Produção e controle da síntese do éster de ácido acrílico através da fermentação do ácido láctico
The continuous development of fermentative processes of low cost and highly efficient to organic acids production to create new opportunities for chemical production from renewable raw materials. The combination of the low cost of lactic acid production from sugarcane fermentation, reduction oil dependence and biocatalysts use, make the production of acrylat
Publicado em: 2010