The Experts below are selected from a list of 41916 Experts worldwide ranked by ideXlab platform
John M. Prausnitz - One of the best experts on this subject based on the ideXlab platform.
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Vapor–liquid equilibria for binary solutions of polyisobutylene in C 6 through C 9 n -alkanes
Polymer, 1999Co-Authors: John G. Lieu, John M. PrausnitzAbstract:Abstract Vapor–liquid equilibria for binary solutions of polyisobutylene in C6 through C9n-alkanes were obtained at 65°C. Using a classic gravimetric-sorption method, the Amount of Solvent absorbed by polyisobutylene was measured as a function of Solvent vapor pressure. The data were interpreted by the Flory–Huggins theory and the Prigogine–Flory–Patterson theory.
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Vapor−Liquid Equilibria for Dendritic-Polymer Solutions
Journal of Chemical & Engineering Data, 1999Co-Authors: John G. Lieu, Mingjun Liu, Jean M. J. Fréchet, John M. PrausnitzAbstract:Vapor−liquid equilibria for dendritic-polymer solutions were obtained using a classic gravimetric-sorption method; the Amount of Solvent absorbed by the dendrimer was measured as a function of solv...
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Vapor-liquid equilibria for solutions of dendritic polymers
Journal of Chemical & Engineering Data, 1998Co-Authors: Cristina Mio, John M. Prausnitz, Simona Kiritsov, Yonathan Thio, Rebecca Brafman, Craig J. Hawker, Eva MalmströmAbstract:Vapor−liquid equilibrium data were obtained for dendritic polymer solutions using a classic isothermal gravimetric-sorption method; the Amount of Solvent absorbed by the dendrimer was measured at increasing Solvent activity. The polymers were polyamidoamine (PAMAM) dendrimers of generations 1, 2, and 4 and benzyl ether dendrimers with different end groups (aromatic rings, dodecyl chains, methyl ester groups, perfluoroalkyl chains) of generations 2 to 6, and two series of benzyl ether linear polymers that are analogues of the dendrimers. Solvents were acetone, acetonitrile, chloroform, cyclohexane, methanol, n-pentane, n-propylamine, tetrahydrofuran, and toluene. The temperature range was 35 to 89 °C. The Amount of Solvent absorbed by the dendrimers depends, sometimes strongly, on the kind of dendrimer end groups. The relation between Solvent absorption and dendrimer generation number, or molecular weight, depends on the Solvent−dendrimer system and on temperature. Solvent absorption in linear polymers is ...
Valeria Flores Peres - One of the best experts on this subject based on the ideXlab platform.
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comparison of soxhlet ultrasound assisted and pressurized liquid extraction of terpenes fatty acids and vitamin e from piper gaudichaudianum kunth
Journal of Chromatography A, 2006Co-Authors: Valeria Flores Peres, Jenifer Saffi, Maria Ines Soares Melecchi, Fernanda Contieri Abad, Rosângela Assis Jacques, Migdalia Miranda Martinez, Eniz Conceicao Oliveira, Elina Bastos CaramaoAbstract:This paper describes a comparative study of extraction methods of terpenes (terpenic alcohols and phytosterols), fatty acids and Vitamin E from leaves of Piper gaudichaudianum Kunth. The analysis of extracts was done by gas chromatography with mass spectrometric detection. The identification and quantification was made by co-injections of the extract with certified standards. The use of pressurized liquid extraction (PLE; Dionex trade name: ASE, for accelerated Solvent extraction) decrease significantly the total time of extraction, the Amount of Solvent and the manipulation of sample and Solvents in comparison with soxhlet (SE) and ultrasound-assisted (USE). In addition, PLE was more effective for the extractions of terpenes (terpenic alcohols and phytosterols), fatty acids and Vitamin E.
Elina Bastos Caramao - One of the best experts on this subject based on the ideXlab platform.
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comparison of soxhlet ultrasound assisted and pressurized liquid extraction of terpenes fatty acids and vitamin e from piper gaudichaudianum kunth
Journal of Chromatography A, 2006Co-Authors: Valeria Flores Peres, Jenifer Saffi, Maria Ines Soares Melecchi, Fernanda Contieri Abad, Rosângela Assis Jacques, Migdalia Miranda Martinez, Eniz Conceicao Oliveira, Elina Bastos CaramaoAbstract:This paper describes a comparative study of extraction methods of terpenes (terpenic alcohols and phytosterols), fatty acids and Vitamin E from leaves of Piper gaudichaudianum Kunth. The analysis of extracts was done by gas chromatography with mass spectrometric detection. The identification and quantification was made by co-injections of the extract with certified standards. The use of pressurized liquid extraction (PLE; Dionex trade name: ASE, for accelerated Solvent extraction) decrease significantly the total time of extraction, the Amount of Solvent and the manipulation of sample and Solvents in comparison with soxhlet (SE) and ultrasound-assisted (USE). In addition, PLE was more effective for the extractions of terpenes (terpenic alcohols and phytosterols), fatty acids and Vitamin E.
Nicholas D. Spencer - One of the best experts on this subject based on the ideXlab platform.
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lubrication properties of a brushlike copolymer as a function of the Amount of Solvent absorbed within the brush
Macromolecules, 2005Co-Authors: M Müller, Scott S. Perry, Nicholas D. SpencerAbstract:The shear forces between poly(l-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG)-modified SiO2 tribopairs have been measured with colloidal-probe, lateral force microscopy (LFM) and related to the mass of Solvent absorbed within the brushlike structure of immobilized PEG chains. The Amount of Solvent (per unit substrate area) absorbed within the tethered, brushlike polymer, referred to as areal solvation, Ψ, appears to be of importance in determining the lubrication properties of the tethered polymers. In this study, the degree of solvation was varied by choosing different Solvents (aqueous buffer solution, methanol, ethanol, and 2-propanol) and was determined by a technique that combines the results of quartz crystal microbalance (QCM-D) experiments and optical waveguide lightmode spectroscopy (OWLS). The highest degree of solvation was measured for aqueous buffer solutions, and a progressive decrease in solvation of PLL-g-PEG was observed in moving from methanol to ethanol to 2-propanol. A concomitant in...
John G. Lieu - One of the best experts on this subject based on the ideXlab platform.
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Vapor–liquid equilibria for binary solutions of polyisobutylene in C 6 through C 9 n -alkanes
Polymer, 1999Co-Authors: John G. Lieu, John M. PrausnitzAbstract:Abstract Vapor–liquid equilibria for binary solutions of polyisobutylene in C6 through C9n-alkanes were obtained at 65°C. Using a classic gravimetric-sorption method, the Amount of Solvent absorbed by polyisobutylene was measured as a function of Solvent vapor pressure. The data were interpreted by the Flory–Huggins theory and the Prigogine–Flory–Patterson theory.
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Vapor−Liquid Equilibria for Dendritic-Polymer Solutions
Journal of Chemical & Engineering Data, 1999Co-Authors: John G. Lieu, Mingjun Liu, Jean M. J. Fréchet, John M. PrausnitzAbstract:Vapor−liquid equilibria for dendritic-polymer solutions were obtained using a classic gravimetric-sorption method; the Amount of Solvent absorbed by the dendrimer was measured as a function of solv...
