Thermodynamics and Phase Equilibria of Carbon Dioxide/polymer Systems PDF Download
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Author: Coray Mariu Colina
Publisher:
ISBN:
Category :
Languages : en
Pages : 171
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Book Description
Keywords: Polymers, SAFT, Monte-Carlo, Modeling.
Author: Coray Mariu Colina
Publisher:
ISBN:
Category :
Languages : en
Pages : 171
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Book Description
Keywords: Polymers, SAFT, Monte-Carlo, Modeling.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A theoretical approach, the SAFT (Statistical Associating Fluid Theory) equation of state, is adapted and extended to understand the thermodynamics and phase equilibria of systems containing carbon dioxide (CO2), CO2-philic and CO2-phobic compounds, including both small molecules (such as n-alkanes and n-perfluoroalkanes) and macromolecules (homopolymers, polymer blends and copolymers), to provide rapid reliable predictions for a wide range of systems of interest. Most prior research has concentrated on developing SAFT equations suitable for phase equilibrium calculations (vapor-liquid and liquid-liquid). In the present work we demonstrate that the SAFT equations are particularly useful not only in pressure-temperature-volume-composition phase equilibrium problems but, also for more difficult aspects of the behavior of mixtures such as derivative properties (e.g., Joule-Thomson inversion curves) and formation of aggregates. To accomplish this goal, we studied the strengths and limitations that different thermodynamic models present not only for pure CO2, but also for its mixtures with small molecules and macromolecules. The research is divided in three major areas: a) a fundamental investigation of the thermophysical properties of pure carbon dioxide, using predictions from both molecular simulations and equations of state; b) a detailed study of the phase equilibria of binary and ternary mixtures of CO2, n-perfluoroalkanes and n-alkanes as a representation of small CO2-philic and partially CO2-phobic compounds; and c) a study of phase equilibria in binary and ternary mixtures of CO2, CO2-philic and CO2-phobic polymers. The ability of the SAFT approach to perform such predictions relies on its more rigorous foundation, since it is practically the only approach that has been able to describe both small molecules and macromolecules.
Author: Christian Wohlfarth
Publisher: CRC Press
ISBN: 1420037692
Category : Science
Languages : en
Pages : 652
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Book Description
This handbook provides the only complete collection of high-pressure thermodynamic data that is essential for understanding polymer solutions. It contains data on vapor-liquid equilibria and gas solubilities, liquid-liquid equilibria, high-pressure fluid phase equilibria for polymer systems in supercritical fluids, enthalpic and volumetric data, as well as second virial coefficients all at elevated pressures. It covers all areas needed by researchers and engineers who handle polymer systems in supercritical fluids; materials science and technological applications such as computerized predictive packages; and chemical and biochemical processes, such as synthesis and characterization, fractionation, separation, purification, and finishing of polymers and related materials.
Author: Christian Wohlfarth
Publisher: CRC Press
ISBN: 1482274906
Category : Science
Languages : en
Pages : 656
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Book Description
Providing valuable insight on physical behavior of polymer solutions, intermolecular interactions, and the molecular nature of mixtures, each volume in this one-of-a-kind handbook brings together reliable, easy-to-use entries, references, tables, examples, and appendices on experimental data from hundreds of primary journal articles, dissertations,
Author: Christian Wohlfarth
Publisher: CRC Press
ISBN: 1498703216
Category : Science
Languages : en
Pages : 596
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Book Description
There is a continuing interest in thermodynamic properties of polymer solutions at elevated pressures. This updated book provides newly published experimental data from the last decade. It includes nearly 500 newly published references containing approximately 175 new vapor-liquid equilibrium data sets, 25 new liquid-liquid equilibrium data sets, 540 new high-pressure fluid phase equilibrium data sets, 60 new data sets describing PVT properties of polymers, and 20 new data sets with densities or excess volumes.
Author: Christian Wohlfarth
Publisher: CRC Press
ISBN: 1466554436
Category : Science
Languages : en
Pages : 776
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Book Description
A large amount of experimental data has been published since the debut of the original CRC Handbook of Thermodynamic Data of Aqueous Polymer Solutions. Incorporating new and updated material, the CRC Handbook of Phase Equilibria and Thermodynamic Data of Aqueous Polymer Solutions provides a comprehensive collection of thermodynamic data of polymer
Author: Kanrakot Thamanavat
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages :
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Book Description
The objectives of this work are to measure phase equilibria in the carbon dioxide + pyrrole system and to correlate and predict the phase behavior of this system with a thermodynamic model. This binary system is of interest due to the growing applications of supercritical carbon dioxide as a solvent or reaction medium for pyrrole. Polypyrrole is an electrically conducting polymer of interest in a number of applications such as anti-static coatings. Pyrrole has also been used as a reactant in enzymatic reaction. Knowledge of the phase behavior of carbon dioxide + pyrrole system is therefore necessary for evaluating optimal conditions and feasibility of such applications. Phase equilibria in the carbon dioxide + pyrrole system were measured at 313 K, 323 K, and 333 K using a synthetic method. Liquid-vapor (LV) phase behavior and liquid-liquid (LL) phase behavior were observed. The pressure in the experiments ranged from 84 to 151.1 bar. The Patel-Teja equation of state and the Mathias-Klotz-Prausnitz mixing rule with two temperature independent parameters was able to correlate the phase equilibrium data satisfactorily and was used to predict the phase behavior at other temperatures. A pressure-temperature diagram was then constructed from these calculations and suggests that the carbon dioxide + pyrrole system exhibit type IV phase behavior in the classification of Scott and van Konynenburg.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
While much progress has been made since the time of Flory and Huggins in the understanding of polymer blend thermodynamics, and ongoing research continues to elucidate how polymer blend phase behavior is affected by the presence of small-molecule solvents or exposure to elevated pressures, very little work has been reported on the combined effects of a pressurized small-molecule solvent on polymer blend phase behavior. The focus of this research is to improve the current state of fundamental understanding regarding how and why the phase behavior of polymer blends changes as pressurized carbon dioxide (CO2) is added. The first part of this work provides a broad overview of previous efforts that explore various thermodynamic and kinetic processes involving the use of CO2 in conjunction with multicomponent polymer systems. The following chapters discuss details of research performed primarily on three blend systems: polystyrene (PS)/polyisoprene (PI), poly(vinylidene fluoride) (PVDF)/ poly(methyl methacrylate) (PMMA), and polydimethylsiloxane (PDMS)/poly(ethylmethylsiloxane) (PEMS). The competing roles of hydrostatic pressure and CO2 dissolution on the phase behavior of both the PS/PI and the PDMS/PEMS blends, which exhibit upper critical solution temperature (UCST) behavior, are systematically established. Additionally, a complete pseudo-binary temperature-composition phase diagram of the PDMS/PEMS blend is generated as a function of CO2 pressure. To compare the predictive abilities of the Flory-Huggins and Sanchez-Lacombe equations of state, interaction parameters of the PDMS/PEMS blend are predicted as functions of temperature and CO2 pressure. The phase behavior of, as well as intermolecular interactions in, PMMA/PVDF blends have been probed in the presence of CO2 by small-angle neutron and x-ray scattering (SANS and SAXS, respectively). These PMMA/PVDF blends, which display both UCST and lower critical solution temperature (LCST.
Author: K. Kamide
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: Christian Wohlfarth
Publisher: CRC Press
ISBN: 1000654222
Category : Science
Languages : en
Pages : 537
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Book Description
The CRC Handbook of Enthalpy Data of Polymer-Solvent Systems presents data that is as essential to the production, process design, and use of polymers as it is to understanding the physical behavior and intermolecular interactions in polymer solutions and in developing thermodynamic polymer models. Providing an all-encompassing collection
