The Experts below are selected from a list of 75924 Experts worldwide ranked by ideXlab platform
José M. Asua - One of the best experts on this subject based on the ideXlab platform.
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On-line control of the Particle Morphology of composite polymer-polymer waterborne dispersions
Chemical Engineering Journal, 2021Co-Authors: Noushin Rajabalinia, Shaghayegh Hamzehlou, Jose R. Leiza, Nicholas Ballard, José M. AsuaAbstract:Abstract Particle Morphology of composite polymer latexes evolves continuously throughout the polymerization process and plays an important role in the practical application of emulsion polymers. Therefore, developing on-line control strategies to control Particle Morphology is a long-term goal in industry that can guarantee the consistent production of latexes with the desired properties for their final application. In this article, the development of an on-line control strategy for Particle Morphology of polymer-polymer composite latex Particles was investigated. The control strategy was based on the idea that the evolution of the Morphology depends on the viscosity of the Particles (that in turn depends on the monomer concentration in the Particles) and the time available for cluster migration (that depends on the polymerization rate). The monomer conversion and the polymerization rate were monitored by reaction calorimetry. The robustness of the developed control strategy in the presence of disturbances during the process is assessed and the limits of the attainable Particle Morphology were explored.
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Experimental validation of a mathematical model for the evolution of the Particle Morphology of waterborne polymer-polymer hybrids: Paving the way to the design and implementation of optimal polymerization strategies
Chemical Engineering Journal, 2019Co-Authors: Noushin Rajabalinia, Shaghayegh Hamzehlou, Jose R. Leiza, José M. AsuaAbstract:Abstract Polymer-polymer composite nanoParticles allow both the improvement of the performance in established applications of waterborne polymer dispersions and targeting new applications that are out of reach of currently available products. The performance of these materials is determined by the Particle Morphology. To open the way to process optimization and on-line control of the Particle Morphology, the capability of the recently developed model to predict the evolution of the Particle Morphology during seeded semibatch emulsion polymerization process was evaluated. Structured polymer Particles were synthesized by copolymerization of styrene and butyl acrylate (St-BA) on methyl methacrylate and butyl acrylate (MMA–BA) copolymer seeds of different glass transition temperature (Tgs). The model captured well the effect of process variables on the evolution of the Particle Morphology, opening the way to the design and implementation of optimal strategies.
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Dynamics of the Particle Morphology during the Synthesis of Waterborne Polymer–Inorganic Hybrids
Macromolecules, 2017Co-Authors: Shaghayegh Hamzehlou, Miren Aguirre, Jose R. Leiza, José M. AsuaAbstract:Waterborne polymer–inorganic hybrids have the potential of both surpassing the performance and targeting applications that are out of reach of conventional polymer dispersions. The properties of these hybrids are determined by the Particle Morphology achieved during the synthesis. In this work, the evolution of the Particle Morphology during the polymerization of (meth)acrylate monomers in the presence of CeO2 was determined by cryo-TEM. Moreover, a mathematical model for the dynamics of the Particle Morphology during the synthesis of polymer–inorganic hybrids was developed, and its capabilities were checked against the experimental data. It is our hope that this study will help to further elucidate the mechanism involved in the process and to lay the foundations for a fine control of Particle Morphology of these materials.
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A new approach for mathematical modeling of the dynamic development of Particle Morphology
Chemical Engineering Journal, 2016Co-Authors: Shaghayegh Hamzehlou, Jose R. Leiza, José M. AsuaAbstract:AbstractA new model for the dynamic evolution of the Morphology of polymer-polymer latex Particles has been developed. This model overcomes the limitations of the existing methodologies that were only able to provide the Morphology of a single Particle, which is only a restricted view of the real system that contains a distribution of Particle morphologies. Taking into account the relevant kinetic and thermodynamic effects, the new model calculates the distribution of morphologies for the whole population of polymer Particles with less computational effort than that needed by the previous models to calculate the Morphology of a single Particle. The model was validated by fitting the evolution of Particle Morphology of composite Particles during polymerization of methyl methacrylate on a polystyrene seed. Furthermore, the ability of the model to predict the evolution of the Particle Morphology for different cases was explored
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Development of Particle Morphology in Emulsion Polymerization. 3. Cluster Nucleation and Dynamics in Polymerizing Systems
Macromolecules, 1996Co-Authors: Luis J. González-ortiz, José M. AsuaAbstract:A mathematical model for the development of the Particle Morphology in emulsion polymerization has been developed. The model accounts for phase separation leading to cluster nucleation, polymerization, polymer diffusion, and cluster migration. The model has been used to simulate batch emulsion polymerizations of methyl methacrylate on a polystyrene seed for which experimentally determined Particle morphologies have been reported. A good agreement between experimental results and model predictions was achieved. On the other hand, sensitivity analysis showed that the final Particle Morphology was not significantly affected by either the initial cluster volume or the cluster nucleation rate constant.
Lazhar Benyahia - One of the best experts on this subject based on the ideXlab platform.
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influence of the protein Particle Morphology and partitioning on the behavior of Particle stabilized water in water emulsions
Langmuir, 2016Co-Authors: Alberto Gonzalezjordan, Taco Nicolai, Lazhar BenyahiaAbstract:Protein fibrils, microgels, and fractal aggregates were produced by heating solutions of β-lactoglobulin (β-lg) under different conditions. The effect of the protein Particle Morphology on the stability and the structure of water-in-water (W/W) emulsions was studied for mixtures of poly(ethylene oxide) (PEO) and dextran. The protein Particles partition to the dextran phase at pH 7.0 where they have a net negative charge, but they prefer the PEO phase at pH 3.0 where they have a net positive charge. The effect of partitioning on the stability and the structure of water-in-water (W/W) emulsions was studied by comparing emulsions at pH 3.0 with those at pH 7.0. The protein Particle Morphology and preference for one phase or the other are shown to have important consequences for the stability and the structure of the emulsions. Fibrils were found to be the most effective stabilizers at pH 7.0, whereas fractals were most effective at pH 3.0. The average droplet size obtained from confocal scanning laser micros...
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Influence of the Protein Particle Morphology and Partitioning on the Behavior of Particle-Stabilized Water-in-Water Emulsions
Langmuir : the ACS journal of surfaces and colloids, 2016Co-Authors: Alberto Gonzalez-jordan, Taco Nicolai, Lazhar BenyahiaAbstract:Protein fibrils, microgels, and fractal aggregates were produced by heating solutions of β-lactoglobulin (β-lg) under different conditions. The effect of the protein Particle Morphology on the stability and the structure of water-in-water (W/W) emulsions was studied for mixtures of poly(ethylene oxide) (PEO) and dextran. The protein Particles partition to the dextran phase at pH 7.0 where they have a net negative charge, but they prefer the PEO phase at pH 3.0 where they have a net positive charge. The effect of partitioning on the stability and the structure of water-in-water (W/W) emulsions was studied by comparing emulsions at pH 3.0 with those at pH 7.0. The protein Particle Morphology and preference for one phase or the other are shown to have important consequences for the stability and the structure of the emulsions. Fibrils were found to be the most effective stabilizers at pH 7.0, whereas fractals were most effective at pH 3.0. The average droplet size obtained from confocal scanning laser microscopy was for most systems between 10 and 5 μm but was notably smaller for emulsions with fractals at pH 3.0.
Shaghayegh Hamzehlou - One of the best experts on this subject based on the ideXlab platform.
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On-line control of the Particle Morphology of composite polymer-polymer waterborne dispersions
Chemical Engineering Journal, 2021Co-Authors: Noushin Rajabalinia, Shaghayegh Hamzehlou, Jose R. Leiza, Nicholas Ballard, José M. AsuaAbstract:Abstract Particle Morphology of composite polymer latexes evolves continuously throughout the polymerization process and plays an important role in the practical application of emulsion polymers. Therefore, developing on-line control strategies to control Particle Morphology is a long-term goal in industry that can guarantee the consistent production of latexes with the desired properties for their final application. In this article, the development of an on-line control strategy for Particle Morphology of polymer-polymer composite latex Particles was investigated. The control strategy was based on the idea that the evolution of the Morphology depends on the viscosity of the Particles (that in turn depends on the monomer concentration in the Particles) and the time available for cluster migration (that depends on the polymerization rate). The monomer conversion and the polymerization rate were monitored by reaction calorimetry. The robustness of the developed control strategy in the presence of disturbances during the process is assessed and the limits of the attainable Particle Morphology were explored.
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Experimental validation of a mathematical model for the evolution of the Particle Morphology of waterborne polymer-polymer hybrids: Paving the way to the design and implementation of optimal polymerization strategies
Chemical Engineering Journal, 2019Co-Authors: Noushin Rajabalinia, Shaghayegh Hamzehlou, Jose R. Leiza, José M. AsuaAbstract:Abstract Polymer-polymer composite nanoParticles allow both the improvement of the performance in established applications of waterborne polymer dispersions and targeting new applications that are out of reach of currently available products. The performance of these materials is determined by the Particle Morphology. To open the way to process optimization and on-line control of the Particle Morphology, the capability of the recently developed model to predict the evolution of the Particle Morphology during seeded semibatch emulsion polymerization process was evaluated. Structured polymer Particles were synthesized by copolymerization of styrene and butyl acrylate (St-BA) on methyl methacrylate and butyl acrylate (MMA–BA) copolymer seeds of different glass transition temperature (Tgs). The model captured well the effect of process variables on the evolution of the Particle Morphology, opening the way to the design and implementation of optimal strategies.
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Dynamics of the Particle Morphology during the Synthesis of Waterborne Polymer–Inorganic Hybrids
Macromolecules, 2017Co-Authors: Shaghayegh Hamzehlou, Miren Aguirre, Jose R. Leiza, José M. AsuaAbstract:Waterborne polymer–inorganic hybrids have the potential of both surpassing the performance and targeting applications that are out of reach of conventional polymer dispersions. The properties of these hybrids are determined by the Particle Morphology achieved during the synthesis. In this work, the evolution of the Particle Morphology during the polymerization of (meth)acrylate monomers in the presence of CeO2 was determined by cryo-TEM. Moreover, a mathematical model for the dynamics of the Particle Morphology during the synthesis of polymer–inorganic hybrids was developed, and its capabilities were checked against the experimental data. It is our hope that this study will help to further elucidate the mechanism involved in the process and to lay the foundations for a fine control of Particle Morphology of these materials.
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A new approach for mathematical modeling of the dynamic development of Particle Morphology
Chemical Engineering Journal, 2016Co-Authors: Shaghayegh Hamzehlou, Jose R. Leiza, José M. AsuaAbstract:AbstractA new model for the dynamic evolution of the Morphology of polymer-polymer latex Particles has been developed. This model overcomes the limitations of the existing methodologies that were only able to provide the Morphology of a single Particle, which is only a restricted view of the real system that contains a distribution of Particle morphologies. Taking into account the relevant kinetic and thermodynamic effects, the new model calculates the distribution of morphologies for the whole population of polymer Particles with less computational effort than that needed by the previous models to calculate the Morphology of a single Particle. The model was validated by fitting the evolution of Particle Morphology of composite Particles during polymerization of methyl methacrylate on a polystyrene seed. Furthermore, the ability of the model to predict the evolution of the Particle Morphology for different cases was explored
Alberto Gonzalezjordan - One of the best experts on this subject based on the ideXlab platform.
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influence of the protein Particle Morphology and partitioning on the behavior of Particle stabilized water in water emulsions
Langmuir, 2016Co-Authors: Alberto Gonzalezjordan, Taco Nicolai, Lazhar BenyahiaAbstract:Protein fibrils, microgels, and fractal aggregates were produced by heating solutions of β-lactoglobulin (β-lg) under different conditions. The effect of the protein Particle Morphology on the stability and the structure of water-in-water (W/W) emulsions was studied for mixtures of poly(ethylene oxide) (PEO) and dextran. The protein Particles partition to the dextran phase at pH 7.0 where they have a net negative charge, but they prefer the PEO phase at pH 3.0 where they have a net positive charge. The effect of partitioning on the stability and the structure of water-in-water (W/W) emulsions was studied by comparing emulsions at pH 3.0 with those at pH 7.0. The protein Particle Morphology and preference for one phase or the other are shown to have important consequences for the stability and the structure of the emulsions. Fibrils were found to be the most effective stabilizers at pH 7.0, whereas fractals were most effective at pH 3.0. The average droplet size obtained from confocal scanning laser micros...
Jose R. Leiza - One of the best experts on this subject based on the ideXlab platform.
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On-line control of the Particle Morphology of composite polymer-polymer waterborne dispersions
Chemical Engineering Journal, 2021Co-Authors: Noushin Rajabalinia, Shaghayegh Hamzehlou, Jose R. Leiza, Nicholas Ballard, José M. AsuaAbstract:Abstract Particle Morphology of composite polymer latexes evolves continuously throughout the polymerization process and plays an important role in the practical application of emulsion polymers. Therefore, developing on-line control strategies to control Particle Morphology is a long-term goal in industry that can guarantee the consistent production of latexes with the desired properties for their final application. In this article, the development of an on-line control strategy for Particle Morphology of polymer-polymer composite latex Particles was investigated. The control strategy was based on the idea that the evolution of the Morphology depends on the viscosity of the Particles (that in turn depends on the monomer concentration in the Particles) and the time available for cluster migration (that depends on the polymerization rate). The monomer conversion and the polymerization rate were monitored by reaction calorimetry. The robustness of the developed control strategy in the presence of disturbances during the process is assessed and the limits of the attainable Particle Morphology were explored.
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Experimental validation of a mathematical model for the evolution of the Particle Morphology of waterborne polymer-polymer hybrids: Paving the way to the design and implementation of optimal polymerization strategies
Chemical Engineering Journal, 2019Co-Authors: Noushin Rajabalinia, Shaghayegh Hamzehlou, Jose R. Leiza, José M. AsuaAbstract:Abstract Polymer-polymer composite nanoParticles allow both the improvement of the performance in established applications of waterborne polymer dispersions and targeting new applications that are out of reach of currently available products. The performance of these materials is determined by the Particle Morphology. To open the way to process optimization and on-line control of the Particle Morphology, the capability of the recently developed model to predict the evolution of the Particle Morphology during seeded semibatch emulsion polymerization process was evaluated. Structured polymer Particles were synthesized by copolymerization of styrene and butyl acrylate (St-BA) on methyl methacrylate and butyl acrylate (MMA–BA) copolymer seeds of different glass transition temperature (Tgs). The model captured well the effect of process variables on the evolution of the Particle Morphology, opening the way to the design and implementation of optimal strategies.
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Dynamics of the Particle Morphology during the Synthesis of Waterborne Polymer–Inorganic Hybrids
Macromolecules, 2017Co-Authors: Shaghayegh Hamzehlou, Miren Aguirre, Jose R. Leiza, José M. AsuaAbstract:Waterborne polymer–inorganic hybrids have the potential of both surpassing the performance and targeting applications that are out of reach of conventional polymer dispersions. The properties of these hybrids are determined by the Particle Morphology achieved during the synthesis. In this work, the evolution of the Particle Morphology during the polymerization of (meth)acrylate monomers in the presence of CeO2 was determined by cryo-TEM. Moreover, a mathematical model for the dynamics of the Particle Morphology during the synthesis of polymer–inorganic hybrids was developed, and its capabilities were checked against the experimental data. It is our hope that this study will help to further elucidate the mechanism involved in the process and to lay the foundations for a fine control of Particle Morphology of these materials.
-
A new approach for mathematical modeling of the dynamic development of Particle Morphology
Chemical Engineering Journal, 2016Co-Authors: Shaghayegh Hamzehlou, Jose R. Leiza, José M. AsuaAbstract:AbstractA new model for the dynamic evolution of the Morphology of polymer-polymer latex Particles has been developed. This model overcomes the limitations of the existing methodologies that were only able to provide the Morphology of a single Particle, which is only a restricted view of the real system that contains a distribution of Particle morphologies. Taking into account the relevant kinetic and thermodynamic effects, the new model calculates the distribution of morphologies for the whole population of polymer Particles with less computational effort than that needed by the previous models to calculate the Morphology of a single Particle. The model was validated by fitting the evolution of Particle Morphology of composite Particles during polymerization of methyl methacrylate on a polystyrene seed. Furthermore, the ability of the model to predict the evolution of the Particle Morphology for different cases was explored
