Polymerization Kinetics
Mostrando 1-12 de 87 artigos, teses e dissertações.
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1. Thermal radical polymerization of Bis(methacrylamide)s
Abstract Methacrylamides monomers for dental applications were synthesized using a one-step procedure starting from methacrylic anhydride and the respective diamine: N,N’-(propane-1,3-diyl)-bis(N-ethyl-2-methylacrylamide) (1), N,N’-(butane-1,4-diyl)-bis(2-methacrylamide) (2), N,N’-(octane-1,8-diyl-)bis(2-methylacrylamide) (3) and N,N’-(1,4-phenylene)
Polímeros. Publicado em: 27/06/2019
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2. ETHYLENE POLYMERIZATION WITH NICKEL DIIMINE COMPLEXES CONTAINING PSEUDOHALIDES
Nickel-diimine complexes DADNiX2 (DAD= 2,6-iPr2-C6H3-N=C(Me)-C(Me)=N-2,6-iPr2-C6H3) containing the non-chelating pseudo-halide ligands isothyocyanate and isoseleniumcyanate (X= NCS 1 and NCSe 2) were synthesized and used in ethylene polymerization activated by methyaluminoxane (MAO) at temperatures from 0 to 50°C. Polymerizations with these complexes were c
Quím. Nova. Publicado em: 2018-07
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3. Isothermal Crystallization Kinetics of Poly(lactic acid) Stereocomplex/Graphene Nanocomposites
The isothermal crystallization kinetics of PLA stereocomplex (scPLA) and scPLA/graphene oxide nanocomposites was investigated. scPLA was prepared by symmetric blending the two isomers, PLLA and PDLA and the scPLA nanocomposite by polymerization of the respective lactides in presence of commercial graphene oxide nanoplatelets (GNPO+) followed of blending the
Mat. Res.. Publicado em: 18/12/2017
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4. Differential Scanning Calorimetry study on curing kinetics of diglycidyl ether of bisphenol A with amine curing agents for self-healing systems
ABSTRACT Epoxy resin is one of the most important polymeric matrixes for diverse uses, such as aeronautical, mobile, electronics and others. Providing a material capable of self-healing microcracks will allow it to have a more reliable and longer use. In order to study this new property of self-healing to an epoxy resin, a Differential Scanning Calorimetry (
Matéria (Rio J.). Publicado em: 20/07/2017
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5. Efficiency of Single Site Phase Transfer Catalyst in Free Radical Polymerization of Butyl Methacrylate - A Kinetic Study
ABSTRACT The effectiveness of single site phase transfer catalyst- 2- benzoylethyldecyldimethylammonium bromide has been studied with the help of kinetics of free radical polymerization of butyl methacrylate. The radical polymerization was catalysed with single site phase transfer catalyst, initiated by water soluble potassium peroxydisulphate initiator in e
Braz. arch. biol. technol.. Publicado em: 23/01/2017
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6. PARTICLE NUCLEATION USING DIFFERENT INITIATORS IN THE MINIEMULSION POLYMERIZATION OF STYRENE
Abstract In miniemulsion polymerization, droplet nucleation is the key factor to ensure the production of polymer particles with a desired composition. The influence of the initiation on droplet nucleation is conflicting and it has not been completely considered. The result of employing different initiator systems on the nucleation mechanism and kinetics in
Braz. J. Chem. Eng.. Publicado em: 2015-03
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7. Removal of Phenol from aqueous solutions by Polymeric composites containing Ni and Co particles
Magnetic composites have a wide range of potential technological applications; however the evaluation of this material for extraction of phenolic compounds has not been sufficiently studied. Due to its high toxicity and solubility the removal of phenolic compounds from the aquatic environments has critical importance. In this work polymeric composites were p
Polímeros. Publicado em: 25/10/2013
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8. Synthesis and thermal degradation Kinetics of D - (+) - galactose containing polymers
In this study, it is investigated the synthesis and characterizations of polymerizable vinyl sugars. Carbohydrate containing polymers were synthesized via free radical polymerization. Thermal behavior of polymer derivatives was analyzed by using DSC and TG. Molecular weight dispersion of polymer derivatives was also analyzed with GPC. Molecular structures we
Polímeros. Publicado em: 2013
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9. Avaliação do grau de conversão monomérica, parâmetros de cinética de polimerização e determinação de monômeros residuais em resinas experimentais / Evaluation of degree of monomer conversion, the polymerization kinetic parameters and determination of residual monomers in experimental resins
Este estudo teve como objetivo investigar múltiplos aspectos relacionados a polimerização da resina composta como: o grau de conversão monomérica (GC), parâmetros da cinética de polimerização e a determinação de monômeros residuais TEGDMA e BisGMA, além de avaliar o desempenho de aparelhos fotoativadores. As resinas compostas experimentais foram
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2012
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10. Influência da simulação da temperatura dental no grau de conversão e cinética de polimerização de cimentos resinosos autodesisivos expostos a diferentes modos de ativação. / Simulating the influence of temperature on dental conversion degree and kinetics of polymerisation of resin cements autodesisivos exposed to different modes of activation.
Este estudo avaliou o grau de conversão (GC) de duas marcas comerciais de cimentos resinosos autoadesivos (CRA), polimerizados em diferentes valores de temperaturas dentais e sob diversas condições de ativação, utilizando Espectroscopia Infravermelha com Transformada de Fourier (FTIR). RelyX U100 (U100, 3M ESPE) e Maxcem Elite (MX, Kerr Corporation) for
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2012
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11. Polimerização do glicerol: uma reação simples e versátil para produzir diferentes materiais a partir do coproduto do biodiesel
In this work, it is proposed a simple experiment in polymer science for undergraduates, involving the glycerol polymerization catalyzed by H2SO4 to produce different materials, e.g. from oligomers to crosslinked polymer. The students can investigate the reaction conditions such as time, temperature and catalyst concentration, thus controlling the extent of p
Química Nova. Publicado em: 2011
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12. Estudo do processo e dos produtos da polimerização de biodiesel de óleo de soja com anidrido ftálico e 2-metil-imidazol utilizando biodiesel como solvente
This work present the polymerization study of the epoxidized methyl esters (MEE) obtained from soybean oil, with phthalic anhydride (AF) and 2-methyl-imidazole (2MI) using soybean oil biodiesel (BD) as solvent, as well as the products characterization. The gelation region for the system MEE/AF/2MI without BD was determined using the Flory¿s theory and it oc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011