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Adsorption of Polymer

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R Gallo – One of the best experts on this subject based on the ideXlab platform.

  • Adsorption of Polyisobutenylsuccinimide Derivatives at a Solid−Hydrocarbon Interface †
    Langmuir, 2001
    Co-Authors: Marie-claude Dubois-clochard, J.-p Durand, B Delfort, P Gateau, Loïc Barré, I Blanchard, Y Chevalier, R Gallo
    Abstract:

    The Adsorption of Polymer dispersants of the polyisobutenylsuccinimide series has been studied at the solid/xylene interface. Carbon black was studied as a model solid. Adsorption isotherms were determined, the enthalpy of Adsorption was measured by calorimetry, and the thickness of the adsorbed layer was obtained from small-angle neutron scattering. The paper emphasizes the structure−properties relationships with the help of a series of polyisobutenylsuccinimides having different polyamine groups and different Polymer architectures, simple diblock (PIBSI) and comblike structure (polyPIBSI). The polyamine part ensured a strong Adsorption on the solid surface, which increased in strength with the number of amine groups. In the same way, changing the diblock structure for a comblike one led to an enhanced affinity of the Polymer for the solid surface. The Adsorption was enthalpic but the Gibbs freefree energy of Adsorption remained moderate because of a large entropy loss during Adsorption. There was an enthalpyentropy compensation phenomenon. Below a concentration of 70 mmol/m3, the Polymers adsorbed as a 30 Å thick monolayer and the Adsorption phenomenon was irreversible, due to the Polymeric nature of the polar part. A drastic increase of adsorbed amount took place for higher concentrations. The formation of reverse hemimicelles was assumed as the origin of this phenomenon. The supplementary Adsorption was reversible, showing that the PolymerPolymer interactions were weaker than the Polymer−surface interactions.

  • Adsorption of Polyisobutenylsuccinimide Derivatives at a Solid-Hydrocarbon Interface †
    Langmuir, 2001
    Co-Authors: Marie-claude Dubois-clochard, J.-p Durand, B Delfort, P Gateau, Loïc Barré, I Blanchard, Y Chevalier, R Gallo
    Abstract:

    The Adsorption of Polymer dispersants of the polyisobutenylsuccinimide series has been studied at the solid/xylene interface. Carbon black was studied as a model solid. Adsorption isotherms were determined, the enthalpy of Adsorption was measured by calorimetry, and the thickness of the adsorbed layer was obtained from small-angle neutron scattering. The paper emphasizes the structure-properties relationships with the help of a series of polyisobutenylsuccinimides having different polyamine groups and different Polymer architectures, simple diblock (PIBSI) and comblike structure (polyPIBSI). The polyamine part ensured a strong Adsorption on the solid surface, which increased in strength with the number of amine groups. In the same way, changing the diblock structure for a comblike one led to an enhanced affinity of the Polymer for the solid surface. The Adsorption was enthalpic but the Gibbs freefree energy of Adsorption remained moderate because of a large entropy loss during Adsorption. There was an enthalpyentropy compensation phenomenon. Below a concentration of 70 mmol/m 3 , the Polymers adsorbed as a 30 Å thick monolayer and the Adsorption phenomenon was irreversible, due to the Polymeric nature of the polar part. A drastic increase of adsorbed amount took place for higher concentrations. The formation of reverse hemimicelles was assumed as the origin of this phenomenon. The supplementary Adsorption was reversible, showing that the PolymerPolymer interactions were weaker than the Polymer-surface interactions.

Oliver Baumchen – One of the best experts on this subject based on the ideXlab platform.

  • Adsorption induced slip inhibition for Polymer melts on ideal substrates
    Nature Communications, 2018
    Co-Authors: Mark Ilton, Thomas Salez, Paul Fowler, Marco Rivetti, Mohammed Aly, Michael Benzaquen, Joshua D Mcgraw, Elie Raphael, Kari Dalnokiveress, Oliver Baumchen
    Abstract:

    Hydrodynamic slip, the motion of a liquid along a solid surface, represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For Polymeric liquids, de Gennes predicted that the Navier boundary condition together with Polymer reptation implies extraordinarily large interfacial slip for entangled Polymer melts on ideal surfaces; this Navier-de Gennes model was confirmed using dewetting experiments on ultrasmooth, low-energy substrates. Here, we use capillary leveling—surface tension driven flow of films with initially non-uniform thicknessof Polymeric films on these same substrates. Measurement of the slip length from a robust one parameter fit to a lubrication model is achieved. We show that at the low shear rates involved in leveling experiments as compared to dewetting ones, the employed substrates can no longer be considered ideal. The data is instead consistent with a model that includes physical Adsorption of Polymer chains at the solid/liquid interface.

  • Adsorption-induced slip inhibition for Polymer melts on ideal substrates
    Nature Communications, 2018
    Co-Authors: Mark Ilton, Thomas Salez, Marco Rivetti, Michael Benzaquen, Joshua D Mcgraw, Elie Raphael, Paul D. Fowler, Kari Dalnoki-veress, Oliver Baumchen
    Abstract:

    Hydrodynamic slip, the motion of a liquid along a solid surface, represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For Polymeric liquids, de Gennes predicted that the Navier boundary condition together with Polymer reptation implies extraordinarily large interfacial slip for entangled Polymer melts on ideal surfaces; this Navier-de Gennes model was confirmed using dewetting experiments on ultra-smooth, low-energy substrates. Here, we use capillary leveling—surface tension driven flow of films with initially non-uniform thicknessof Polymeric films on these same substrates. Measurement of the slip length from a robust one parameter fit to a lubrication model is achieved. We show that at the low shear rates involved in leveling experiments as compared to dewetting ones, the employed substrates can no longer be considered ideal. The data is instead consistent with a model that includes physical Adsorption of Polymer chains at the solid/liquid interface. When modeling fluid flow over a solid surface, one must determine the slip velocity at the boundary. Here Ilton et al. perform experiments to quantify the slip length of Polymer melts at a nearly ideal solid surface and capture them in a model involving the density of physically adsorbed Polymer chains.

  • Adsorption induced slip inhibition for Polymer melts on ideal substrates
    arXiv: Soft Condensed Matter, 2017
    Co-Authors: Mark Ilton, Thomas Salez, Paul Fowler, Marco Rivetti, Mohammed Aly, Michael Benzaquen, Joshua D Mcgraw, Elie Raphael, Kari Dalnokiveress, Oliver Baumchen
    Abstract:

    Hydrodynamic slip of a liquid at a solid surface represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For Polymeric liquids, de Gennes predicted that the Navier boundary condition together with the theory of Polymer dynamics imply extraordinarily large interfacial slip for entangled Polymer melts on ideal surfaces; this Navier-de Gennes model was confirmed using dewetting experiments on ultra-smooth, low-energy substrates. Here, we use capillary leveling – surface tension driven flow of films with initially non-uniform thicknessof Polymeric films on these same substrates. Measurement of the slip length from a robust one-parameter fit to a lubrication model is achieved. We show that at the lower shear rates involved in leveling experiments as compared to dewetting ones, the employed substrates can no longer be considered ideal. The data is instead consistent with physical Adsorption of Polymer chains at the solid/liquid interface. We extend the Navier-de Gennes description using one additional parameter, namely the density of physically adsorbed chains per unit surface. The resulting formulation is found to be in excellent agreement with the experimental observations.

Yu.s Lipatov – One of the best experts on this subject based on the ideXlab platform.

  • Effect of flexibility of Polymer chains on the kinetics of Adsorption of Polymer mixtures from solutions
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007
    Co-Authors: V.n. Chornaya, Yu.s Lipatov, Galina Menzheres, T. T. Todosiichuk, Yu. V. Maslak
    Abstract:

    Abstract The study of the kinetics of Adsorption of Polymers from solutions of mixtures of Polymers with different thermodynamic flexibility ( σ ) of Polymer chains, such as cellulose triacetate (CTA) ( σ  = 6.0) and poly(butylmethacrylate) (PBMA) ( σ  = 2.0) has been done. Aerosil was used as an adsorbent. Adsorption parameters, such as an Adsorption value ( Г ), Adsorption interaction energy ( Q ) and degree of the adsorbent surface coverage ( θ ) were determined by infrared specspectroscopy. The Adsorption rate ( V  = ∂ Γ /∂ t ) at different parts of the kinetic characteristics, and diffusion coefficients ( D ) in the Adsorption process also were calculated. The values of the diffusion coefficients ( D  = 5.0 × 10 −12 to 7.0 × 10 −14 ) determined for binary and ternary Polymer solutions indicate high restraint of Polymer macromolecules in the solutions. In such conditions, the Adsorption rate is limited by the integration of the new adsorbing macromolecules to the already formed Adsorption layer for establishing the equilibrium conformation. The data on the Adsorption interaction energy and the degree of the adsorbent surface coverage for both Polymers by Adsorption from binary and ternary solutions are discussed. The obtained results provide a possibility to determine the relationship between the kinetic and thermodynamic parameters that affect the structure of the Adsorption layer in the process of establishing the Adsorption equilibrium.

  • Polymer blends and interpenetrating Polymer networks at the interface with solids
    Progress in Polymer Science, 2002
    Co-Authors: Yu.s Lipatov
    Abstract:

    Abstract This review deals with a variety of the processes proceeding in Polymer blends at the interface with solids. By the contact of a Polymer blend with a solid surface, the thermodynamic state of the blends changes due to physical interaction of the blend component with the surface. In processes of Adsorption of Polymer mixtures at the interface with solid from solutions and processes of surface segregation from one-phase blends there takes place the formation of near-surface layers with compositions different from the composition of the initial Polymer blends. Such a differences change the conditions of phase separation in thin films of a Polymer blend. The effects under consideration depend on three thermodynamic interaction parameters: Polymer A–solid, Polymer B–solid, Polymers A–B. Theoretical concepts and experimental data on the Adsorption of Polymer blends from solution, surface segregation and phase separation at the interface with solid are presented and discussed. Special attention is paid to the analysis of the phase state of the Polymer blends in thin layers at the interface and to the mechanisms of the changing conditions of phase separation in the presence of a solid. The peculiarities of the behavior of the formation of interpenetrating Polymer networks (IPNs) in the presence of a solid are considered and the characteristic features of phase separation and surface segregation of IPNs in the course of the chemical reactions are discussed.

  • Dependence of the Adsorption of Polymer mixtures from solution on the amount of an adsorbent
    Journal of colloid and interface science, 2002
    Co-Authors: Yu.s Lipatov, Tamara Todosijchuk, V.n. Chornaya, Galina Menzheres
    Abstract:

    Simultaneous competitive Adsorption from solutions of mixtures of poly(butyl methacrylate) and polystyrene and Adsorption of each component from binary solutions have been studied for three ratios of the adsorbent mass to the solution volume, A/V. It was found that Adsorption from both binary and ternary solutions strongly depends on the amount of an adsorbent, Adsorption of poly(butyl methacrylate) being preferential. The characteristic Adsorption isotherms of both Polymers were constructed under conditions of equal equilibrium concentration of each component to estimate the parameters of preferential Adsorption and their dependence on the A/V ratio. It was found that the A/V effect plays an important role in Adsorption from Polymer mixtures and determines the peculiarities of Adsorption from Polymer mixtures as well as from solution of single Polymers. Changing the A/V ratio may be one way to regulate the composition of an Adsorption layer consisting of two chemically different Polymers. The reasons for the A/V effect are considered in the framework of the concept of the plurality of Adsorption equilibria between two chemically different components and between fractions of different molecular mass of each component having various absorbability.

Marie-claude Dubois-clochard – One of the best experts on this subject based on the ideXlab platform.

  • Adsorption of Polyisobutenylsuccinimide Derivatives at a Solid−Hydrocarbon Interface †
    Langmuir, 2001
    Co-Authors: Marie-claude Dubois-clochard, J.-p Durand, B Delfort, P Gateau, Loïc Barré, I Blanchard, Y Chevalier, R Gallo
    Abstract:

    The Adsorption of Polymer dispersants of the polyisobutenylsuccinimide series has been studied at the solid/xylene interface. Carbon black was studied as a model solid. Adsorption isotherms were determined, the enthalpy of Adsorption was measured by calorimetry, and the thickness of the adsorbed layer was obtained from small-angle neutron scattering. The paper emphasizes the structure−properties relationships with the help of a series of polyisobutenylsuccinimides having different polyamine groups and different Polymer architectures, simple diblock (PIBSI) and comblike structure (polyPIBSI). The polyamine part ensured a strong Adsorption on the solid surface, which increased in strength with the number of amine groups. In the same way, changing the diblock structure for a comblike one led to an enhanced affinity of the Polymer for the solid surface. The Adsorption was enthalpic but the Gibbs free energy of Adsorption remained moderate because of a large entropy loss during Adsorption. There was an enthalpy−entropy compensation phenomenon. Below a concentration of 70 mmol/m3, the Polymers adsorbed as a 30 Å thick monolayer and the Adsorption phenomenon was irreversible, due to the Polymeric nature of the polar part. A drastic increase of adsorbed amount took place for higher concentrations. The formation of reverse hemimicelles was assumed as the origin of this phenomenon. The supplementary Adsorption was reversible, showing that the PolymerPolymer interactions were weaker than the Polymer−surface interactions.

  • Adsorption of Polyisobutenylsuccinimide Derivatives at a Solid-Hydrocarbon Interface †
    Langmuir, 2001
    Co-Authors: Marie-claude Dubois-clochard, J.-p Durand, B Delfort, P Gateau, Loïc Barré, I Blanchard, Y Chevalier, R Gallo
    Abstract:

    The Adsorption of Polymer dispersants of the polyisobutenylsuccinimide series has been studied at the solid/xylene interface. Carbon black was studied as a model solid. Adsorption isotherms were determined, the enthalpy of Adsorption was measured by calorimetry, and the thickness of the adsorbed layer was obtained from small-angle neutron scattering. The paper emphasizes the structure-properties relationships with the help of a series of polyisobutenylsuccinimides having different polyamine groups and different Polymer architectures, simple diblock (PIBSI) and comblike structure (polyPIBSI). The polyamine part ensured a strong Adsorption on the solid surface, which increased in strength with the number of amine groups. In the same way, changing the diblock structure for a comblike one led to an enhanced affinity of the Polymer for the solid surface. The Adsorption was enthalpic but the Gibbs free energy of Adsorption remained moderate because of a large entropy loss during Adsorption. There was an enthalpy-entropy compensation phenomenon. Below a concentration of 70 mmol/m 3 , the Polymers adsorbed as a 30 Å thick monolayer and the Adsorption phenomenon was irreversible, due to the Polymeric nature of the polar part. A drastic increase of adsorbed amount took place for higher concentrations. The formation of reverse hemimicelles was assumed as the origin of this phenomenon. The supplementary Adsorption was reversible, showing that the PolymerPolymer interactions were weaker than the Polymer-surface interactions.

Xiangming Kong – One of the best experts on this subject based on the ideXlab platform.