Download or read book Thermodynamics and Phase Equilibria of Carbon Dioxide polymer Systems written by Coray Mariu Colina and published by . This book was released on 2004 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: Polymers, SAFT, Monte-Carlo, Modeling.
Download or read book Thermodynamics and Phase Equilibria of Carbon Dioxide Polymer Systems written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book CRC Handbook of Thermodynamic Data of Polymer Solutions at Elevated Pressures written by Christian Wohlfarth and published by CRC Press. This book was released on 2005-01-27 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book CRC Handbook of Thermodynamic Data of Polymer Solutions Three Volume Set written by Christian Wohlfarth and published by CRC Press. This book was released on 2018-10-03 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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,
Download or read book CRC Handbook of Phase Equilibria and Thermodynamic Data of Polymer Solutions at Elevated Pressures written by Christian Wohlfarth and published by CRC Press. This book was released on 2015-02-10 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book CRC Handbook of Phase Equilibria and Thermodynamic Data of Aqueous Polymer Solutions written by Christian Wohlfarth and published by CRC Press. This book was released on 2012-08-10 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book High Pressure Phase Equilibria in the Carbon Dioxide Pyrrole System written by Kanrakot Thamanavat and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Modification of Polymer Blend Phase Behavior with High Pressure Carbon Dioxide written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Thermodynamics of Phase Equilibria of Polymer Solutions written by K. Kamide and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CRC Handbook of Enthalpy Data of Polymer Solvent Systems written by Christian Wohlfarth and published by CRC Press. This book was released on 2006-02-21 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Thermodynamic Models written by Michael L. Michelsen and published by . This book was released on 2007 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Equilibria with Supercritical Carbon Dioxide written by Mercedes G. Montalbán and published by Intechopen. This book was released on 2022-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We are living in a critical time, both for humanity and the planet, which has led us to look for more sustainable formulas to interact with the environment. One of the important changes in the design and operation of chemical processes is the search for environmentally friendly technologies. Supercritical carbon dioxide has been revealed as a promising environmentally friendly solvent that is energy efficient, selective and capable of reducing waste, making it a promising alternative to conventional organic solvents. However, reliable and versatile mathematical models of phase equilibrium thermodynamics are needed for the use of supercritical carbon dioxide in process design and viability studies. This book reviews experimental procedures for obtaining high-pressure phase equilibria data and describes the phase diagrams of binary mixtures and some thermodynamic models capable of determining the conditions of phase equilibria at high pressures. These concepts are applied to the components of the transesterification reaction of rac-2-pentanol with a vinyl ester, which is important in the pharmaceutical industry because (S)-2-pentanol can be obtained as a reaction product. This product is a key intermediate in the synthesis of drugs against Alzheimer's disease.
Download or read book Thermodynamics and Phase Behavior of Miscible Polymer Blends in the Presence of Supercritical Carbon Dioxide written by Nicholas Philip Young and published by . This book was released on 2014 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamics of Polymer Solutions written by Michio Kurata and published by CRC Press. This book was released on 1982 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Equilibria in Polymer supercritical CO2 Systems written by Barbara Bonavoglia and published by . This book was released on 2005 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Thermodynamics written by Sabine Enders and published by Springer Science & Business Media. This book was released on 2011-01-13 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Making Flory-Huggins Practical: Thermodynamics of Polymer-Containing Mixtures, by B. A. Wolf * Aqueous Solutions of Polyelectrolytes: Vapor-Liquid Equilibrium and Some Related Properties, by G. Maurer, S. Lammertz, and L. Ninni Schäfer * Gas-Polymer Interactions: Key Thermodynamic Data and Thermophysical Properties, by J.-P. E. Grolier, and S. A.E. Boyer * Interfacial Tension in Binary Polymer Blends and the Effects of Copolymers as Emulsifying Agents, by S. H. Anastasiadis * Theory of Random Copolymer Fractionation in Columns, by Sabine Enders * Computer Simulations and Coarse-Grained Molecular Models Predicting the Equation of State of Polymer Solutions, by K. Binder, B. Mognetti, W. Paul, P. Virnau, and L. Yelash * Modeling of Polymer Phase Equilibria Using Equations of State, by G. Sadowski
Download or read book Thermodynamic and Glass Transition Behavior in CO2 polymer Systems Emphasizing the Surface Region written by Dehua Liu and published by . This book was released on 2006 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Application of carbon dioxide in polymer processing is a very attractive and innovative research area, driven by its significant impacts on environmental concerns, scientific and technological advancement and challenge. In this work, the interaction between CO2 and polymer, including both bulk phase and thin film, has been addressed and modeled in order to guide the product and process development with the aid of CO2. An Axisymmetric Drop Shape Analysis (ADSA) method was developed to determine the CO2-induced polymer dilation over a wide range of temperature and pressure. The experimental CO2 sorption, polymer swelling and glass transition temperature (Tg) depression, have been successfully integrated with a single model, i.e., Sanchez-Lacombe Equation of State (SLEOS). Moreover, the benefits of CO2 were demonstrated in the manufacturing of drug/polymer composite by reducing the operation temperature up to 35°C. Meanwhile, the anomalous polymer surface property, particularly Tg, was revealed in the development of CO2-assisted polymer interfacial bonding technique. It is believed that the polymer surface has a lower Tg relative to its regular bulk value. An Atomic Force Microscopy (AFM)-based visualization method was developed to explore this surface phenomenon. The results demonstrated that CO2 is able to further enhance the chain mobility near the surface region and allow the surface manipulation at lower temperatures. It has been hypothesized that shifts in the glass transition temperature in a polymer thin film or near a polymer surface is the result of liquid-like layer in that special region. We report here the first attempt to confirm this liquid-like layer theoretically by applying an inhomogeneous fluid theory combined with a chain molecule equation of state. Calculated entropy gradients in the surface region of a polymer reveal a liquid-like layer on the order of 1 nm at temperatures below the bulk Tg. This simple model provides a robust starting point for exploring the relation between experimentally observed anomalous properties and the inhomogeneities present near the surface.
