Influence of Component Ratio on Adsorption of Polymer Mixtures under Phase Separation of Solutions

Lipatov, Yu.S.; Todosijchuk, Tamara; Chornaya, Valentine

doi:10.1006/jcis.1999.6235

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…As mentioned earlier by Lipatov et al27 and Lipatov et al28 the adsorbent mass and the initial ratio between the two components before the adsorption takes place have an influence on the composition of the final equilibrium. In order to investigate influence of adsorbent mass and influence of initial composition of the gaseous phase, six binary diluted mixtures have been studied (these influences are discussed elsewhere17).…”

Section: Results and Analysesmentioning

confidence: 78%

ZnBr₂‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

Vega-Cantú

Hauge

Norman

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:The excellent chemical properties and resistance to oil of poly(acrylonitrile-co-butadiene), or nitrilebutadiene rubber (NBR), has led to the extensive use of these elastomers as O-ring material in the oil extraction industry. The degradation of NBR gaskets is known to occur during the well completion and oil extraction process when they are exposed to bromide fluids such as ZnBr 2 -based completion fluid. Samples of NBR, polyacrylonitrile, and polybutadiene were exposed to ZnBr 2 -based completion fluid and analyzed by attenuated total reflectance (ATR) and diffuse reflectance IR. These analyses showed that the ZnBr 2 completion fluid promoted the hydrolysis of the nitrile group to form amides and carboxylic groups. The carbon-carbon double bonds in NBR were unaffected after short exposure to ZnBr 2 -based completion fluid but were quickly hydrated in acidic bromide mixtures.

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Section: Results and Analysesmentioning

confidence: 78%

ZnBr₂‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

Vega-Cantú

Hauge

Norman

et al. 2003

J of Applied Polymer Sci

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“…Adsorption in the PBMA−PS−SiO 2 (silica) system represents a traditional case for comparison of the abovementioned theoretical considerations with the experiment, and it has been addressed in several previous publications. ,− The PBMA/PS system Flory−Huggins interaction parameter χ AB has been measured to be 0.0072 . It is a small positive value denoting the immiscibility of the polymer components.…”

Section: Resultsmentioning

confidence: 99%

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Lipatov

Özdemir

et al. 2007

Langmuir

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Atomic force microscopy (AFM) and ultrasonic force microscopy (UFM) have been used to study the properties of adsorption layers formed by two incompatible polymers, polystyrene and poly(butyl methacrylate), in the course of simultaneous adsorption on the surface of silica (naturally oxidized surface of a silicon wafer). The adsorption was performed from solutions containing both of the components in a common solvent (carbon tetrachloride) in dilute and semidilute concentration regimes. It was discovered that in both cases the structure of adsorption layers has a complex mosaic structure, the details of which depend on solution composition, on the solution concentration regime, and on the ratio of the components in the adsorption layer. The observed structural inhomogeneity on the length scale of approximately 200-500 nm (distribution of segment density revealed by UFM) appears as result of thermodynamic incompatibility in the system and is conditioned by changes in the conformation states of the adsorbed macromolecules in the route of competitive adsorption of the components. The adsorbed polymer films with thicknesses of approximately 20-500 nm appeared to have fractal properties and could be characterized with fractal dimensions dependent on the ratio of the components at the interface and the adsorption conditions.

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“…As mentioned earlier by Lipatov et al 27 and Lipatov et al 28 the adsorbent mass and the initial ratio between the two components before the adsorption takes place have an influence on the composition of the final equilibrium. In order to investigate influence of adsorbent mass and influence of initial composition of the gaseous phase, six binary diluted mixtures have been studied (these influences are discussed elsewhere 17 ).…”

Section: Binary Diluted Mixture Adsorption Isothermsmentioning

confidence: 91%

Modeling of adsorption isotherm of a binary mixture with real adsorbed solution theory and nonrandom two‐liquid model

2010

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in Wiley Online Library (wileyonlinelibrary.com).Gas-phase adsorption equilibria of diluted mixtures of methyl-ethyl-ketone and isopropylanol on activated carbon were investigated. Experimental isotherms were determined by a constant volume method. Single-component adsorption isotherms were fitted by the frequently used Toth model with good accuracy. Then adsorption isotherms were determined for different binary mixtures (with different initial ratio of the two components). Binary mixtures adsorption isotherms were calculated using the adsorbed solution theory. Ideal adsorbed solution theory (IAST) could not represent experimental data, but it was observed that increasing amount of MEK led to higher nonideality of the mixture. Then UNIversal QUAsi Chemical (UNIQUAC) and nonrandom twoliquids (NRTL) models were considered to describe activity coefficients of the adsorbed phase. The fitted parameters of UNIQUAC model depend on the ratio of the two components, whereas the NRTL model is able to fit all experiments with the same parameters, whatever the initial ratio may be.

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Influence of Component Ratio on Adsorption of Polymer Mixtures under Phase Separation of Solutions

Cited by 4 publications

References 10 publications

ZnBr₂‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

ZnBr₂‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Modeling of adsorption isotherm of a binary mixture with real adsorbed solution theory and nonrandom two‐liquid model

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Influence of Component Ratio on Adsorption of Polymer Mixtures under Phase Separation of Solutions

Cited by 4 publications

References 10 publications

ZnBr2‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

ZnBr2‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

Atomic Force and Ultrasonic Force Microscopy Investigation of Adsorbed Layers Formed by Two Incompatible Polymers: Polystyrene and Poly(butyl methacrylate)

Modeling of adsorption isotherm of a binary mixture with real adsorbed solution theory and nonrandom two‐liquid model

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ZnBr₂‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)

ZnBr₂‐catalyzed chemical effects in poly(acrylonitrile‐ co‐butadiene)